CHANGELOG.md

# WordPress Hooks Changelog

This document is automatically generated from the hooks extracted from WordPress and lists new actions, new filters, and parameter changes by version.

## WordPress 7.1

### New Actions

- [`wp_ability_invoked`](https://developer.wordpress.org/reference/hooks/wp_ability_invoked/) - Fires when an ability is invoked, before any processing takes place.

### New Filters

- [`is_user_member_of_blog`](https://developer.wordpress.org/reference/hooks/is_user_member_of_blog/) - Filters whether the user is a member of a given blog.
- [`login_remember_me_help_text`](https://developer.wordpress.org/reference/hooks/login_remember_me_help_text/) - Filters the help text shown in the "Remember Me" tooltip on the login form.
- [`rest_abilities_collection_params`](https://developer.wordpress.org/reference/hooks/rest_abilities_collection_params/) - Filters REST API collection parameters for the abilities controller.
- [`wp_ability_execute_result`](https://developer.wordpress.org/reference/hooks/wp_ability_execute_result/) - Filters the result returned by an ability's execute callback.
- [`wp_ability_normalize_input`](https://developer.wordpress.org/reference/hooks/wp_ability_normalize_input/) - Filters the normalized input for an ability.
- [`wp_ability_permission_result`](https://developer.wordpress.org/reference/hooks/wp_ability_permission_result/) - Filters the result of an ability's permission check.
- [`wp_ability_validate_input`](https://developer.wordpress.org/reference/hooks/wp_ability_validate_input/) - Filters the input validation result for an ability.
- [`wp_ability_validate_output`](https://developer.wordpress.org/reference/hooks/wp_ability_validate_output/) - Filters the output validation result for an ability.
- [`wp_ai_client_cache_group`](https://developer.wordpress.org/reference/hooks/wp_ai_client_cache_group/) - Filters the cache group used by the WP AI Client cache adapter.
- [`wp_auto_approve_ping`](https://developer.wordpress.org/reference/hooks/wp_auto_approve_ping/) - Filters whether a pingback is approved without being held for moderation.
- [`wp_client_side_media_processing_enabled`](https://developer.wordpress.org/reference/hooks/wp_client_side_media_processing_enabled/) - Filters whether client-side media processing is enabled.
- [`wp_get_abilities_item_include`](https://developer.wordpress.org/reference/hooks/wp_get_abilities_item_include/) - Filters whether an individual ability should be included in the result set.
- [`wp_get_abilities_result`](https://developer.wordpress.org/reference/hooks/wp_get_abilities_result/) - Filters the full list of matched abilities after all per-item filtering is complete.
- [`wp_get_entity_view_config_hook_name($kind, $name)`](https://developer.wordpress.org/reference/hooks/wp_get_entity_view_config_hook_name(kind, name)/) - Filters the view configuration for a given entity.
- [`wp_json_schema_allowed_keywords`](https://developer.wordpress.org/reference/hooks/wp_json_schema_allowed_keywords/) - Filters the JSON Schema keywords allowed for a given schema profile.
- [`wp_pre_execute_ability`](https://developer.wordpress.org/reference/hooks/wp_pre_execute_ability/) - Filters whether to short-circuit ability execution.
- [`wp_should_disable_pings_for_environment`](https://developer.wordpress.org/reference/hooks/wp_should_disable_pings_for_environment/) - Filters whether pings should be disabled for the current environment.

### Changes

- [`media_library_infinite_scrolling`](https://developer.wordpress.org/reference/hooks/media_library_infinite_scrolling/) - Changed default to <code>true</code> and introduced per-user opt-out of infinite scrolling.
- [`notify_post_author`](https://developer.wordpress.org/reference/hooks/notify_post_author/) - Comment approval status is checked before this filter, and the filter no longer fires for invalid comment IDs.
- [`pre_wp_filesize`](https://developer.wordpress.org/reference/hooks/pre_wp_filesize/) - Negative values are now ignored, being treated the same as null. Numeric values are cast to integers.
- [`safe_style_css`](https://developer.wordpress.org/reference/hooks/safe_style_css/) - Added support for SVG presentation attributes.
- [`wp_after_execute_ability`](https://developer.wordpress.org/reference/hooks/wp_after_execute_ability/) - Added the <code>$ability</code> parameter.
- [`wp_before_execute_ability`](https://developer.wordpress.org/reference/hooks/wp_before_execute_ability/) - Added the <code>$ability</code> parameter.
- [`wp_filesize`](https://developer.wordpress.org/reference/hooks/wp_filesize/) - The return value is now always zero or greater. Numeric values are cast to integers.

## WordPress 7.0

### New Actions

- [`wp_ai_client_{$event_name}`](https://developer.wordpress.org/reference/hooks/wp_ai_client_event_name/) - Fires when an AI client event is dispatched.
- [`wp_connectors_init`](https://developer.wordpress.org/reference/hooks/wp_connectors_init/) - Fires when the connector registry is ready for plugins to register connectors.
- [`wp_trigger_error_always_run`](https://developer.wordpress.org/reference/hooks/wp_trigger_error_always_run/) - Always fires when the given function triggers a user-level error/warning/notice/deprecation message.

### New Filters

- [`block_core_breadcrumbs_items`](https://developer.wordpress.org/reference/hooks/block_core_breadcrumbs_items/) - Filters the breadcrumb items array before rendering.
- [`block_core_breadcrumbs_post_type_settings`](https://developer.wordpress.org/reference/hooks/block_core_breadcrumbs_post_type_settings/) - Filters breadcrumb settings (taxonomy and term selection) for a post or post type.
- [`default_role_dropdown_excluded_roles`](https://developer.wordpress.org/reference/hooks/default_role_dropdown_excluded_roles/) - Filters the roles to be excluded from the default_role option.
- [`plugins_list_status_text`](https://developer.wordpress.org/reference/hooks/plugins_list_status_text/) - Filters the status text of default switch case in the plugins list table.
- [`propagate_network_user_spam_to_blogs`](https://developer.wordpress.org/reference/hooks/propagate_network_user_spam_to_blogs/) - Filters whether to propagate the blog status when a user is marked as spam.
- [`rest_block_hooks_post_types`](https://developer.wordpress.org/reference/hooks/rest_block_hooks_post_types/) - Filters which post types should have Block Hooks applied.
- [`rest_block_hooks_post_types`](https://developer.wordpress.org/reference/hooks/rest_block_hooks_post_types/) - Filters which post types should have Block Hooks applied.
- [`wp_ai_client_default_request_timeout`](https://developer.wordpress.org/reference/hooks/wp_ai_client_default_request_timeout/) - Filters the default request timeout in seconds for AI Client HTTP requests.
- [`wp_ai_client_prevent_prompt`](https://developer.wordpress.org/reference/hooks/wp_ai_client_prevent_prompt/) - Filters whether to prevent the prompt from being executed.
- [`wp_get_archives_args`](https://developer.wordpress.org/reference/hooks/wp_get_archives_args/) - Filters the arguments for displaying archive links.
- [`wp_supports_ai`](https://developer.wordpress.org/reference/hooks/wp_supports_ai/) - Filters whether the current request can use AI.
- [`wp_trigger_error_trigger_error`](https://developer.wordpress.org/reference/hooks/wp_trigger_error_trigger_error/) - Filters whether to trigger an error.

### Changes

- [`gallery_style`](https://developer.wordpress.org/reference/hooks/gallery_style/) - Removed the <code>type</code> attribute for any theme.
- [`load_script_textdomain_relative_path`](https://developer.wordpress.org/reference/hooks/load_script_textdomain_relative_path/) - The <code>$is_module</code> parameter was added.
- [`option_page_capability_{$option_page}`](https://developer.wordpress.org/reference/hooks/option_page_capability_option_page/) - Applied when <code>wp-admin/options.php</code> is accessed directly.
- [`the_author_posts_link`](https://developer.wordpress.org/reference/hooks/the_author_posts_link/) - Added <code>$author</code> and <code>$title</code> parameters.
- [`wp_hash_password_algorithm`](https://developer.wordpress.org/reference/hooks/wp_hash_password_algorithm/) - The <code>$algorithm</code> parameter is now always a string.
- [`wp_hash_password_options`](https://developer.wordpress.org/reference/hooks/wp_hash_password_options/) - The <code>$algorithm</code> parameter is now always a string.

## WordPress 6.9

### New Actions

- [`after_populate_network`](https://developer.wordpress.org/reference/hooks/after_populate_network/) - Fires after a network is fully populated.
- [`after_upgrade_to_multisite`](https://developer.wordpress.org/reference/hooks/after_upgrade_to_multisite/) - Fires after a network is created when converting a single site to multisite.
- [`before_populate_network`](https://developer.wordpress.org/reference/hooks/before_populate_network/) - Fires before a network is populated.
- [`pre_post_insert`](https://developer.wordpress.org/reference/hooks/pre_post_insert/) - Fires immediately before a new post is inserted in the database.
- [`update_term_count`](https://developer.wordpress.org/reference/hooks/update_term_count/) - Fires when a term count is calculated, before it is updated in the database.
- [`wp_abilities_api_categories_init`](https://developer.wordpress.org/reference/hooks/wp_abilities_api_categories_init/) - Fires when preparing ability categories registry.
- [`wp_abilities_api_init`](https://developer.wordpress.org/reference/hooks/wp_abilities_api_init/) - Fires when preparing abilities registry.
- [`wp_after_execute_ability`](https://developer.wordpress.org/reference/hooks/wp_after_execute_ability/) - Fires immediately after an ability finished executing.
- [`wp_before_execute_ability`](https://developer.wordpress.org/reference/hooks/wp_before_execute_ability/) - Fires before an ability gets executed, after input validation and permissions check.
- [`wp_before_include_template`](https://developer.wordpress.org/reference/hooks/wp_before_include_template/) - Fires immediately before including the template.
- [`wp_finalized_template_enhancement_output_buffer`](https://developer.wordpress.org/reference/hooks/wp_finalized_template_enhancement_output_buffer/) - Fires after the template enhancement output buffer has been finalized.
- [`wp_template_enhancement_output_buffer_started`](https://developer.wordpress.org/reference/hooks/wp_template_enhancement_output_buffer_started/) - Fires when the template enhancement output buffer has started.

### New Filters

- [`block_bindings_supported_attributes`](https://developer.wordpress.org/reference/hooks/block_bindings_supported_attributes/) - Filters the supported block attributes for block bindings.
- [`block_bindings_supported_attributes_{$block_type}`](https://developer.wordpress.org/reference/hooks/block_bindings_supported_attributes_block_type/) - Filters the supported block attributes for block bindings.
- [`block_core_social_link_get_services`](https://developer.wordpress.org/reference/hooks/block_core_social_link_get_services/) - Filter the list of available social service.
- [`enqueue_empty_block_content_assets`](https://developer.wordpress.org/reference/hooks/enqueue_empty_block_content_assets/) - Filters whether to enqueue assets for a block which has no rendered content.
- [`post_states_html`](https://developer.wordpress.org/reference/hooks/post_states_html/) - Filters the HTML string of post states.
- [`pre_site_option`](https://developer.wordpress.org/reference/hooks/pre_site_option/) - Filters the value of any existing network option before it is retrieved.
- [`quick_edit_statuses`](https://developer.wordpress.org/reference/hooks/quick_edit_statuses/) - Filters the statuses available in the Quick Edit and Bulk Edit UI.
- [`validate_plugin_requirements`](https://developer.wordpress.org/reference/hooks/validate_plugin_requirements/) - Filters the plugin requirement validation response.
- [`validate_theme_requirements`](https://developer.wordpress.org/reference/hooks/validate_theme_requirements/) - Filters the theme requirement validation response.
- [`wp_ajax_menu_quick_search_args`](https://developer.wordpress.org/reference/hooks/wp_ajax_menu_quick_search_args/) - Filter the menu quick search arguments.
- [`wp_mail_embed_args`](https://developer.wordpress.org/reference/hooks/wp_mail_embed_args/) - Filters the arguments for PHPMailer's addEmbeddedImage() method.
- [`wp_register_ability_args`](https://developer.wordpress.org/reference/hooks/wp_register_ability_args/) - Filters the ability arguments before they are validated and used to instantiate the ability.
- [`wp_register_ability_category_args`](https://developer.wordpress.org/reference/hooks/wp_register_ability_category_args/) - Filters the ability category arguments before they are validated and used to instantiate the ability category.
- [`wp_should_output_buffer_template_for_enhancement`](https://developer.wordpress.org/reference/hooks/wp_should_output_buffer_template_for_enhancement/) - Filters whether the template should be output-buffered for enhancement.
- [`wp_template_enhancement_output_buffer`](https://developer.wordpress.org/reference/hooks/wp_template_enhancement_output_buffer/) - Filters the template enhancement output buffer prior to sending to the client.

### Changes

- [`get_{$adjacent}_post_sort`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_sort/) - Adds ID sort to ensure deterministic ordering for posts with identical dates.
- [`get_{$adjacent}_post_where`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_where/) - Adds ID-based fallback for posts with identical dates in adjacent post queries.
- [`get_avatar_comment_types`](https://developer.wordpress.org/reference/hooks/get_avatar_comment_types/) - The 'note' comment type was added.
- [`pre_wp_mail`](https://developer.wordpress.org/reference/hooks/pre_wp_mail/) - The <code>$embeds</code> element was added to the <code>$atts</code> array.
- [`styles_inline_size_limit`](https://developer.wordpress.org/reference/hooks/styles_inline_size_limit/) - The default limit increased from 20K to 40K.
- [`wp_mail_succeeded`](https://developer.wordpress.org/reference/hooks/wp_mail_succeeded/) - The <code>$embeds</code> element was added to the <code>$mail_data</code> array.
- [`wp_mail`](https://developer.wordpress.org/reference/hooks/wp_mail/) - The <code>$embeds</code> element was added to the <code>$args</code> array.

## WordPress 6.8

### New Actions

- [`import_filters`](https://developer.wordpress.org/reference/hooks/import_filters/) - Fires at the end of the Import screen.
- [`set_site_transient`](https://developer.wordpress.org/reference/hooks/set_site_transient/) - Fires after the value for a site transient has been set.
- [`set_transient`](https://developer.wordpress.org/reference/hooks/set_transient/) - Fires after the value for a transient has been set.
- [`wp_load_speculation_rules`](https://developer.wordpress.org/reference/hooks/wp_load_speculation_rules/) - Fires when speculation rules data is loaded, allowing to amend the rules.

### New Filters

- [`bulk_action_observer_ids`](https://developer.wordpress.org/reference/hooks/bulk_action_observer_ids/) (6.8.1) - Filters the array of field name attributes for bulk actions.
- [`get_calendar_args`](https://developer.wordpress.org/reference/hooks/get_calendar_args/) - Filter the `get_calendar` function arguments before they are used.
- [`image_max_bit_depth`](https://developer.wordpress.org/reference/hooks/image_max_bit_depth/) - Filters the maximum bit depth of resized images.
- [`is_post_embeddable`](https://developer.wordpress.org/reference/hooks/is_post_embeddable/) - Filter whether a post is embeddable.
- [`manage_users-network_custom_column`](https://developer.wordpress.org/reference/hooks/manage_users-network_custom_column/) - Filters the display output of custom columns in the Network Users list table.
- [`password_needs_rehash`](https://developer.wordpress.org/reference/hooks/password_needs_rehash/) - Filters whether the password hash needs to be rehashed.
- [`pre_count_many_users_posts`](https://developer.wordpress.org/reference/hooks/pre_count_many_users_posts/) - Filters whether to short-circuit performing the post counts.
- [`render_block_core_navigation_link_allowed_post_status`](https://developer.wordpress.org/reference/hooks/render_block_core_navigation_link_allowed_post_status/) - Filter allowed post_status for navigation link block to render.
- [`rest_menu_read_access`](https://developer.wordpress.org/reference/hooks/rest_menu_read_access/) - Filters whether the current user has read access to menu items via the REST API.
- [`should_load_block_assets_on_demand`](https://developer.wordpress.org/reference/hooks/should_load_block_assets_on_demand/) - Filters whether block styles should be loaded on demand.
- [`the_password_form_incorrect_password`](https://developer.wordpress.org/reference/hooks/the_password_form_incorrect_password/) - Filters the invalid password message shown on password-protected posts.
- [`theme_block_pattern_files`](https://developer.wordpress.org/reference/hooks/theme_block_pattern_files/) - Filters list of block pattern files for a theme.
- [`wp_hash_password_algorithm`](https://developer.wordpress.org/reference/hooks/wp_hash_password_algorithm/) - Filters the hashing algorithm to use in the password_hash() and password_needs_rehash() functions.
- [`wp_hash_password_options`](https://developer.wordpress.org/reference/hooks/wp_hash_password_options/) - Filters the options passed to the password_hash() and password_needs_rehash() functions.
- [`wp_next_scheduled`](https://developer.wordpress.org/reference/hooks/wp_next_scheduled/) - Filters the timestamp of the next scheduled event for the given hook.
- [`wp_prevent_unsupported_mime_type_uploads`](https://developer.wordpress.org/reference/hooks/wp_prevent_unsupported_mime_type_uploads/) - Filter whether the server should prevent uploads for image types it doesn't support. Default true.
- [`wp_speculation_rules_configuration`](https://developer.wordpress.org/reference/hooks/wp_speculation_rules_configuration/) - Filters the way that speculation rules are configured.
- [`wp_speculation_rules_href_exclude_paths`](https://developer.wordpress.org/reference/hooks/wp_speculation_rules_href_exclude_paths/) - Filters the paths for which speculative loading should be disabled.

### Changes

- [`check_password`](https://developer.wordpress.org/reference/hooks/check_password/) - Passwords are now hashed with bcrypt by default. Old passwords may still be hashed with phpass or md5.
- [`date_formats`](https://developer.wordpress.org/reference/hooks/date_formats/) - Added the <code>d.m.Y</code> format.
- [`get_calendar`](https://developer.wordpress.org/reference/hooks/get_calendar/) - Added the <code>$args</code> parameter.
- [`the_password_form`](https://developer.wordpress.org/reference/hooks/the_password_form/) - Added the <code>$invalid_password</code> parameter.
- [`wp_create_application_password`](https://developer.wordpress.org/reference/hooks/wp_create_application_password/) - The hashed password value now uses wp_fast_hash() instead of phpass.
- [`wp_editor_set_quality`](https://developer.wordpress.org/reference/hooks/wp_editor_set_quality/) - Added the <code>$size</code> parameter.
- [`wp_get_attachment_image_attributes`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_image_attributes/) (6.8.2) - The <code>$attr</code> array includes <code>width</code> and <code>height</code> attributes.
- [`wp_pre_insert_user_data`](https://developer.wordpress.org/reference/hooks/wp_pre_insert_user_data/) - The user's password is now hashed using bcrypt by default instead of phpass.
- [`wp_update_application_password`](https://developer.wordpress.org/reference/hooks/wp_update_application_password/) - The password is now hashed using wp_fast_hash() instead of phpass. Existing passwords may still be hashed using phpass.

## WordPress 6.7

### New Actions

_No new actions in this version._

### New Filters

- [`block_bindings_source_value`](https://developer.wordpress.org/reference/hooks/block_bindings_source_value/) - Filters the output of a block bindings source.
- [`feed_links_args`](https://developer.wordpress.org/reference/hooks/feed_links_args/) - Filters the feed links arguments.
- [`feed_links_extra_args`](https://developer.wordpress.org/reference/hooks/feed_links_extra_args/) - Filters the extra feed links arguments.
- [`pre_attachment_url_to_postid`](https://developer.wordpress.org/reference/hooks/pre_attachment_url_to_postid/) - Filters the attachment ID to allow short-circuit the function.
- [`script_module_data_{$module_id}`](https://developer.wordpress.org/reference/hooks/script_module_data_module_id/) - Filters data associated with a given Script Module.
- [`wp_allowed_block_metadata_collection_roots`](https://developer.wordpress.org/reference/hooks/wp_allowed_block_metadata_collection_roots/) (6.7.2) - Filters the root directory paths for block metadata collections.
- [`wp_img_tag_add_auto_sizes`](https://developer.wordpress.org/reference/hooks/wp_img_tag_add_auto_sizes/) (6.7.1) - Filters whether auto-sizes for lazy loaded images is enabled.

### Changes

- [`get_edit_comment_link`](https://developer.wordpress.org/reference/hooks/get_edit_comment_link/) - The <code>$comment_id</code> and <code>$context</code> parameters are now being passed to the filter.
- [`image_editor_output_format`](https://developer.wordpress.org/reference/hooks/image_editor_output_format/) - The default was changed from an empty array to an array containing the HEIC/HEIF images mime types.
- [`wp_set_password`](https://developer.wordpress.org/reference/hooks/wp_set_password/) - The <code>$old_user_data</code> parameter was added.

## WordPress 6.6

### New Actions

- [`delete_post_{$post->post_type}`](https://developer.wordpress.org/reference/hooks/delete_post_post-post_type/) - Fires immediately before a post is deleted from the database.
- [`deleted_post_{$post->post_type}`](https://developer.wordpress.org/reference/hooks/deleted_post_post-post_type/) - Fires immediately after a post is deleted from the database.

### New Filters

- [`activate_tinymce_for_media_description`](https://developer.wordpress.org/reference/hooks/activate_tinymce_for_media_description/) - Filters the TinyMCE argument for the media description field on the attachment details screen.
- [`interactivity_process_directives`](https://developer.wordpress.org/reference/hooks/interactivity_process_directives/) - Filters whether Interactivity API should process directives.
- [`lang_dir_for_domain`](https://developer.wordpress.org/reference/hooks/lang_dir_for_domain/) - Filters the determined languages directory path for a specific domain and locale.
- [`site_status_autoloaded_options_action_to_perform`](https://developer.wordpress.org/reference/hooks/site_status_autoloaded_options_action_to_perform/) - Filters actionable information to tackle the problem. It can be a link to an external guide.
- [`site_status_autoloaded_options_limit_description`](https://developer.wordpress.org/reference/hooks/site_status_autoloaded_options_limit_description/) - Filters description to be shown on Site Health warning when threshold is met.
- [`site_status_autoloaded_options_size_limit`](https://developer.wordpress.org/reference/hooks/site_status_autoloaded_options_size_limit/) - Filters max bytes threshold to trigger warning in Site Health.
- [`wp_autoload_values_to_autoload`](https://developer.wordpress.org/reference/hooks/wp_autoload_values_to_autoload/) - Filters the autoload values that should be considered for autoloading from the options table.
- [`wp_default_autoload_value`](https://developer.wordpress.org/reference/hooks/wp_default_autoload_value/) - Allows to determine the default autoload value for an option where no explicit value is passed.
- [`wp_max_autoloaded_option_size`](https://developer.wordpress.org/reference/hooks/wp_max_autoloaded_option_size/) - Filters the maximum size of option value in bytes.
- [`wp_theme_files_cache_ttl`](https://developer.wordpress.org/reference/hooks/wp_theme_files_cache_ttl/) - Filters the cache expiration time for theme files.

### Changes

- [`comment_cookie_lifetime`](https://developer.wordpress.org/reference/hooks/comment_cookie_lifetime/) - The default <code>$seconds</code> value changed from 30000000 to YEAR_IN_SECONDS.
- [`load_translation_file`](https://developer.wordpress.org/reference/hooks/load_translation_file/) - Added the <code>$locale</code> parameter.
- [`split_the_query`](https://developer.wordpress.org/reference/hooks/split_the_query/) - Added the <code>$old_request</code> and <code>$clauses</code> parameters.
- [`wp_preload_resources`](https://developer.wordpress.org/reference/hooks/wp_preload_resources/) - Added the <code>$fetchpriority</code> attribute.

## WordPress 6.5

### New Actions

- [`after_plugin_row_meta`](https://developer.wordpress.org/reference/hooks/after_plugin_row_meta/) - Fires after plugin row meta.

### New Filters

- [`block_core_navigation_listable_blocks`](https://developer.wordpress.org/reference/hooks/block_core_navigation_listable_blocks/) - Filter the list of blocks that need a list item wrapper.
- [`font_dir`](https://developer.wordpress.org/reference/hooks/font_dir/) - Filters the fonts directory data.
- [`get_block_type_uses_context`](https://developer.wordpress.org/reference/hooks/get_block_type_uses_context/) - Filters the registered uses context for a block type.
- [`get_block_type_variations`](https://developer.wordpress.org/reference/hooks/get_block_type_variations/) - Filters the registered variations for a block type.
- [`hooked_block`](https://developer.wordpress.org/reference/hooks/hooked_block/) - Filters the parsed block array for a given hooked block.
- [`hooked_block_{$hooked_block_type}`](https://developer.wordpress.org/reference/hooks/hooked_block_hooked_block_type/) - Filters the parsed block array for a given hooked block.
- [`image_save_progressive`](https://developer.wordpress.org/reference/hooks/image_save_progressive/) - Filters whether to output progressive images (if available).
- [`load_translation_file`](https://developer.wordpress.org/reference/hooks/load_translation_file/) - Filters the file path for loading translations for the given text domain.
- [`new_admin_email_subject`](https://developer.wordpress.org/reference/hooks/new_admin_email_subject/) - Filters the subject of the email sent when a change of site admin email address is attempted.
- [`pre_get_language_files_from_path`](https://developer.wordpress.org/reference/hooks/pre_get_language_files_from_path/) - Filters the translation files retrieved from a specified path before the actual lookup.
- [`rest_font_collections_collection_params`](https://developer.wordpress.org/reference/hooks/rest_font_collections_collection_params/) - Filters REST API collection parameters for the font collections controller.
- [`rest_prepare_font_collection`](https://developer.wordpress.org/reference/hooks/rest_prepare_font_collection/) - Filters the font collection data for a REST API response.
- [`rest_prepare_wp_font_face`](https://developer.wordpress.org/reference/hooks/rest_prepare_wp_font_face/) - Filters the font face data for a REST API response.
- [`rest_prepare_wp_font_family`](https://developer.wordpress.org/reference/hooks/rest_prepare_wp_font_family/) - Filters the font family data for a REST API response.
- [`rest_wp_font_face_collection_params`](https://developer.wordpress.org/reference/hooks/rest_wp_font_face_collection_params/) - Filters collection parameters for the font face controller.
- [`rest_wp_font_family_collection_params`](https://developer.wordpress.org/reference/hooks/rest_wp_font_family_collection_params/) - Filters collection parameters for the font family controller.
- [`script_module_loader_src`](https://developer.wordpress.org/reference/hooks/script_module_loader_src/) - Filters the script module source.
- [`translation_file_format`](https://developer.wordpress.org/reference/hooks/translation_file_format/) - Filters the preferred file format for translation files.
- [`wp_admin_canonical_url`](https://developer.wordpress.org/reference/hooks/wp_admin_canonical_url/) - Filters the admin canonical URL value.
- [`wp_is_rest_endpoint`](https://developer.wordpress.org/reference/hooks/wp_is_rest_endpoint/) - Filters whether a REST endpoint request is currently being handled.
- [`wp_plugin_dependencies_slug`](https://developer.wordpress.org/reference/hooks/wp_plugin_dependencies_slug/) - Filters a plugin dependency's slug before matching to the WordPress.org slug format.

### Changes

- [`do_shortcode_tag`](https://developer.wordpress.org/reference/hooks/do_shortcode_tag/) - The <code>$attr</code> parameter is always an array.
- [`pre_do_shortcode_tag`](https://developer.wordpress.org/reference/hooks/pre_do_shortcode_tag/) - The <code>$attr</code> parameter is always an array.

## WordPress 6.4

### New Actions

- [`deprecated_class_run`](https://developer.wordpress.org/reference/hooks/deprecated_class_run/) - Fires when a deprecated class is called.
- [`wp_admin_notice`](https://developer.wordpress.org/reference/hooks/wp_admin_notice/) - Fires before an admin notice is output.
- [`wp_trigger_error_run`](https://developer.wordpress.org/reference/hooks/wp_trigger_error_run/) - Fires when the given function triggers a user-level error/warning/notice/deprecation message.

### New Filters

- [`block_widgets_no_javascript_message`](https://developer.wordpress.org/reference/hooks/block_widgets_no_javascript_message/) - Filters the message displayed in the block widget interface when JavaScript is not enabled in the browser.
- [`deprecated_class_trigger_error`](https://developer.wordpress.org/reference/hooks/deprecated_class_trigger_error/) - Filters whether to trigger an error for a deprecated class.
- [`hooked_block_types`](https://developer.wordpress.org/reference/hooks/hooked_block_types/) - Filters the list of hooked block types for a given anchor block type and relative position.
- [`pre_get_available_post_mime_types`](https://developer.wordpress.org/reference/hooks/pre_get_available_post_mime_types/) - Filters the list of available post MIME types for the given post type.
- [`pre_unzip_file`](https://developer.wordpress.org/reference/hooks/pre_unzip_file/) - Filters archive unzipping to override with a custom process.
- [`pre_wp_get_https_detection_errors`](https://developer.wordpress.org/reference/hooks/pre_wp_get_https_detection_errors/) - Short-circuits the process of detecting errors related to HTTPS support.
- [`pre_wp_get_loading_optimization_attributes`](https://developer.wordpress.org/reference/hooks/pre_wp_get_loading_optimization_attributes/) - Filters whether to short-circuit loading optimization attributes.
- [`quick_edit_enabled_for_post_type`](https://developer.wordpress.org/reference/hooks/quick_edit_enabled_for_post_type/) - Filters whether Quick Edit should be enabled for the given post type.
- [`quick_edit_enabled_for_taxonomy`](https://developer.wordpress.org/reference/hooks/quick_edit_enabled_for_taxonomy/) - Filters whether Quick Edit should be enabled for the given taxonomy.
- [`unzip_file`](https://developer.wordpress.org/reference/hooks/unzip_file/) - Filters the result of unzipping an archive.
- [`wp_admin_notice_args`](https://developer.wordpress.org/reference/hooks/wp_admin_notice_args/) - Filters the arguments for an admin notice.
- [`wp_admin_notice_markup`](https://developer.wordpress.org/reference/hooks/wp_admin_notice_markup/) - Filters the markup for an admin notice.
- [`wp_get_loading_optimization_attributes`](https://developer.wordpress.org/reference/hooks/wp_get_loading_optimization_attributes/) - Filters the loading optimization attributes.
- [`wp_loading_optimization_force_header_contexts`](https://developer.wordpress.org/reference/hooks/wp_loading_optimization_force_header_contexts/) - Filters the header-specific contexts.
- [`wp_post_revision_meta_keys`](https://developer.wordpress.org/reference/hooks/wp_post_revision_meta_keys/) - Filter the list of post meta keys to be revisioned.

### Changes

- [`_wp_put_post_revision`](https://developer.wordpress.org/reference/hooks/_wp_put_post_revision/) - The <code>$post_id</code> parameter was added.
- [`block_editor_no_javascript_message`](https://developer.wordpress.org/reference/hooks/block_editor_no_javascript_message/) - Added <code>$installed</code> parameter.
- [`register_{$post_type}_post_type_args`](https://developer.wordpress.org/reference/hooks/register_post_type_post_type_args/) - Added <code>late_route_registration</code>, <code>autosave_rest_controller_class</code> and <code>revisions_rest_controller_class</code> arguments.
- [`wp_creating_autosave`](https://developer.wordpress.org/reference/hooks/wp_creating_autosave/) - The <code>$is_update</code> parameter was added to indicate if the autosave is being updated or was newly created.

## WordPress 6.3

### New Actions

- [`bulk_edit_posts`](https://developer.wordpress.org/reference/hooks/bulk_edit_posts/) - Fires after processing the post data for bulk edit.
- [`wp_cache_set_last_changed`](https://developer.wordpress.org/reference/hooks/wp_cache_set_last_changed/) - Fires after a cache group `last_changed` time is updated.
- [`wp_update_user`](https://developer.wordpress.org/reference/hooks/wp_update_user/) - Fires after the user has been updated and emails have been sent.

### New Filters

- [`cron_memory_limit`](https://developer.wordpress.org/reference/hooks/cron_memory_limit/) - Filters the memory limit allocated for WP-Cron event processing.
- [`get_pages_query_args`](https://developer.wordpress.org/reference/hooks/get_pages_query_args/) - Filters query arguments passed to WP_Query in get_pages().
- [`image_edit_thumbnails_separately`](https://developer.wordpress.org/reference/hooks/image_edit_thumbnails_separately/) - Shows the settings in the Image Editor that allow selecting to edit only the thumbnail of an image.
- [`nav_menu_item_attributes`](https://developer.wordpress.org/reference/hooks/nav_menu_item_attributes/) - Filters the HTML attributes applied to a menu's list item element.
- [`nav_menu_submenu_attributes`](https://developer.wordpress.org/reference/hooks/nav_menu_submenu_attributes/) - Filters the HTML attributes applied to a menu list element.
- [`plugins_list`](https://developer.wordpress.org/reference/hooks/plugins_list/) - Filters the array of plugins for the list table.
- [`pre_load_textdomain`](https://developer.wordpress.org/reference/hooks/pre_load_textdomain/) - Filters whether to short-circuit loading .mo file.
- [`pre_wp_setup_nav_menu_item`](https://developer.wordpress.org/reference/hooks/pre_wp_setup_nav_menu_item/) - Filters whether to short-circuit the wp_setup_nav_menu_item() output.
- [`site_editor_no_javascript_message`](https://developer.wordpress.org/reference/hooks/site_editor_no_javascript_message/) - Filters the message displayed in the site editor interface when JavaScript is not enabled in the browser.
- [`wp_authorize_application_redirect_url_invalid_protocols`](https://developer.wordpress.org/reference/hooks/wp_authorize_application_redirect_url_invalid_protocols/) (6.3.2) - Filters the list of invalid protocols used in applications redirect URLs.
- [`wp_get_attachment_image_context`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_image_context/) - Filters the context in which wp_get_attachment_image() is used.
- [`wp_min_priority_img_pixels`](https://developer.wordpress.org/reference/hooks/wp_min_priority_img_pixels/) - Filters the minimum square-pixels threshold for an image to be eligible as the high-priority image.
- [`wp_navigation_should_create_fallback`](https://developer.wordpress.org/reference/hooks/wp_navigation_should_create_fallback/) - Filters whether or not a fallback should be created.

### Changes

- [`pre_trash_post`](https://developer.wordpress.org/reference/hooks/pre_trash_post/) - Added the <code>$previous_status</code> parameter.
- [`rest_allowed_cors_headers`](https://developer.wordpress.org/reference/hooks/rest_allowed_cors_headers/) - The <code>$request</code> parameter was added.
- [`rest_exposed_cors_headers`](https://developer.wordpress.org/reference/hooks/rest_exposed_cors_headers/) - The <code>$request</code> parameter was added.
- [`rest_send_nocache_headers`](https://developer.wordpress.org/reference/hooks/rest_send_nocache_headers/) (6.3.2) - Moved the block to catch the filter added on rest_cookie_check_errors() from wp-includes/rest-api.php.
- [`trashed_post`](https://developer.wordpress.org/reference/hooks/trashed_post/) - Added the <code>$previous_status</code> parameter.
- [`wp_omit_loading_attr_threshold`](https://developer.wordpress.org/reference/hooks/wp_omit_loading_attr_threshold/) - The default threshold was changed from 1 to 3.
- [`wp_trash_post`](https://developer.wordpress.org/reference/hooks/wp_trash_post/) - Added the <code>$previous_status</code> parameter.

## WordPress 6.2

### New Actions

- [`comment_reply_to_unapproved_comment`](https://developer.wordpress.org/reference/hooks/comment_reply_to_unapproved_comment/) - Fires when a comment reply is attempted to an unapproved comment.
- [`wp_set_password`](https://developer.wordpress.org/reference/hooks/wp_set_password/) - Fires after the user password is set.

### New Filters

- [`comment_author_link_rel`](https://developer.wordpress.org/reference/hooks/comment_author_link_rel/) - Filters the rel attributes of the comment author's link.
- [`post_search_columns`](https://developer.wordpress.org/reference/hooks/post_search_columns/) - Filters the columns to search in a WP_Query search.
- [`pre_wp_load_alloptions`](https://developer.wordpress.org/reference/hooks/pre_wp_load_alloptions/) - Filters the array of alloptions before it is populated.
- [`sanitize_locale_name`](https://developer.wordpress.org/reference/hooks/sanitize_locale_name/) (6.2.1) - Filters a sanitized locale name string.
- [`wp_get_attachment_link_attributes`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_link_attributes/) - Filters the list of attachment link attributes.
- [`wp_internal_hosts`](https://developer.wordpress.org/reference/hooks/wp_internal_hosts/) - Filters the array of URL hosts which are considered internal.
- [`wp_save_post_revision_revisions_before_deletion`](https://developer.wordpress.org/reference/hooks/wp_save_post_revision_revisions_before_deletion/) - Filters the revisions to be considered for deletion.

### Changes

- [`override_load_textdomain`](https://developer.wordpress.org/reference/hooks/override_load_textdomain/) - Added the <code>$locale</code> parameter.
- [`send_auth_cookies`](https://developer.wordpress.org/reference/hooks/send_auth_cookies/) - The <code>$expire</code>, <code>$expiration</code>, <code>$user_id</code>, <code>$scheme</code>, and <code>$token</code> parameters were added.
- [`switch_locale`](https://developer.wordpress.org/reference/hooks/switch_locale/) - The <code>$user_id</code> parameter was added.

## WordPress 6.1

### New Actions

- [`cron_reschedule_event_error`](https://developer.wordpress.org/reference/hooks/cron_reschedule_event_error/) - Fires if an error happens when rescheduling a cron event.
- [`cron_unschedule_event_error`](https://developer.wordpress.org/reference/hooks/cron_unschedule_event_error/) - Fires if an error happens when unscheduling a cron event.
- [`wp_after_load_template`](https://developer.wordpress.org/reference/hooks/wp_after_load_template/) - Fires after a template file is loaded.
- [`wp_before_load_template`](https://developer.wordpress.org/reference/hooks/wp_before_load_template/) - Fires before a template file is loaded.

### New Filters

- [`ajax_term_search_results`](https://developer.wordpress.org/reference/hooks/ajax_term_search_results/) - Filters the Ajax term search results.
- [`block_core_navigation_render_inner_blocks`](https://developer.wordpress.org/reference/hooks/block_core_navigation_render_inner_blocks/) - Filter navigation block $inner_blocks.
- [`feed_links_extra_show_author_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_author_feed/) - Filters whether to display the author feed link.
- [`feed_links_extra_show_category_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_category_feed/) - Filters whether to display the category feed link.
- [`feed_links_extra_show_post_comments_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_post_comments_feed/) - Filters whether to display the post comments feed link.
- [`feed_links_extra_show_post_type_archive_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_post_type_archive_feed/) - Filters whether to display the post type archive feed link.
- [`feed_links_extra_show_search_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_search_feed/) - Filters whether to display the search results feed link.
- [`feed_links_extra_show_tag_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_tag_feed/) - Filters whether to display the tag feed link.
- [`feed_links_extra_show_tax_feed`](https://developer.wordpress.org/reference/hooks/feed_links_extra_show_tax_feed/) - Filters whether to display the custom taxonomy feed link.
- [`get_header_image`](https://developer.wordpress.org/reference/hooks/get_header_image/) - Filters the header image URL.
- [`lost_password_html_link`](https://developer.wordpress.org/reference/hooks/lost_password_html_link/) - Filters the link that allows the user to reset the lost password.
- [`post_class_taxonomies`](https://developer.wordpress.org/reference/hooks/post_class_taxonomies/) - Filters the taxonomies to generate classes for each individual term.
- [`pre_option`](https://developer.wordpress.org/reference/hooks/pre_option/) - Filters the value of any existing option before it is retrieved.
- [`pre_wp_list_authors_post_counts_query`](https://developer.wordpress.org/reference/hooks/pre_wp_list_authors_post_counts_query/) - Filters whether to short-circuit performing the query for author post counts.
- [`query_loop_block_query_vars`](https://developer.wordpress.org/reference/hooks/query_loop_block_query_vars/) - Filters the arguments which will be passed to `WP_Query` for the Query Loop Block.
- [`rest_json_encode_options`](https://developer.wordpress.org/reference/hooks/rest_json_encode_options/) - Filters the JSON encoding options used to send the REST API response.
- [`site_status_available_object_cache_services`](https://developer.wordpress.org/reference/hooks/site_status_available_object_cache_services/) - Filters the persistent object cache services available to the user.
- [`site_status_good_response_time_threshold`](https://developer.wordpress.org/reference/hooks/site_status_good_response_time_threshold/) - Filters the threshold below which a response time is considered good.
- [`site_status_page_cache_supported_cache_headers`](https://developer.wordpress.org/reference/hooks/site_status_page_cache_supported_cache_headers/) - Filters the list of cache headers supported by core.
- [`site_status_persistent_object_cache_notes`](https://developer.wordpress.org/reference/hooks/site_status_persistent_object_cache_notes/) - Filters the second paragraph of the health check's description when suggesting the use of a persistent object cache.
- [`site_status_persistent_object_cache_thresholds`](https://developer.wordpress.org/reference/hooks/site_status_persistent_object_cache_thresholds/) - Filters the thresholds used to determine whether to suggest the use of a persistent object cache.
- [`site_status_persistent_object_cache_url`](https://developer.wordpress.org/reference/hooks/site_status_persistent_object_cache_url/) - Filters the action URL for the persistent object cache health check.
- [`site_status_should_suggest_persistent_object_cache`](https://developer.wordpress.org/reference/hooks/site_status_should_suggest_persistent_object_cache/) - Filters whether to suggest use of a persistent object cache and bypass default threshold checks.
- [`the_posts_pagination_args`](https://developer.wordpress.org/reference/hooks/the_posts_pagination_args/) - Filters the arguments for posts pagination links.
- [`update_themes_{$hostname}`](https://developer.wordpress.org/reference/hooks/update_themes_hostname/) - Filters the update response for a given theme hostname.
- [`wp_img_tag_add_decoding_attr`](https://developer.wordpress.org/reference/hooks/wp_img_tag_add_decoding_attr/) - Filters the `decoding` attribute value to add to an image. Default 'async'.
- [`wp_list_authors_args`](https://developer.wordpress.org/reference/hooks/wp_list_authors_args/) - Filters the query arguments for the list of all authors of the site.
- [`wp_list_table_class_name`](https://developer.wordpress.org/reference/hooks/wp_list_table_class_name/) - Filters the list table class to instantiate.
- [`wp_list_users_args`](https://developer.wordpress.org/reference/hooks/wp_list_users_args/) - Filters the query arguments for the list of all users of the site.
- [`wp_preload_resources`](https://developer.wordpress.org/reference/hooks/wp_preload_resources/) - Filters domains and URLs for resource preloads.
- [`wp_read_audio_metadata`](https://developer.wordpress.org/reference/hooks/wp_read_audio_metadata/) - Filters the array of metadata retrieved from an audio file.
- [`wp_required_field_indicator`](https://developer.wordpress.org/reference/hooks/wp_required_field_indicator/) - Filters the markup for a visual indicator of required form fields.
- [`wp_required_field_message`](https://developer.wordpress.org/reference/hooks/wp_required_field_message/) - Filters the message to explain required form fields.
- [`wp_send_new_user_notification_to_admin`](https://developer.wordpress.org/reference/hooks/wp_send_new_user_notification_to_admin/) - Filters whether the admin is notified of a new user registration.
- [`wp_send_new_user_notification_to_user`](https://developer.wordpress.org/reference/hooks/wp_send_new_user_notification_to_user/) - Filters whether the user is notified of their new user registration.
- [`wp_theme_json_data_blocks`](https://developer.wordpress.org/reference/hooks/wp_theme_json_data_blocks/) - Filters the data provided by the blocks for global styles & settings.
- [`wp_theme_json_data_default`](https://developer.wordpress.org/reference/hooks/wp_theme_json_data_default/) - Filters the default data provided by WordPress for global styles & settings.
- [`wp_theme_json_data_theme`](https://developer.wordpress.org/reference/hooks/wp_theme_json_data_theme/) - Filters the data provided by the theme for global styles and settings.
- [`wp_theme_json_data_user`](https://developer.wordpress.org/reference/hooks/wp_theme_json_data_user/) - Filters the data provided by the user for global styles & settings.
- [`wp_theme_json_get_style_nodes`](https://developer.wordpress.org/reference/hooks/wp_theme_json_get_style_nodes/) - Filters the list of style nodes with metadata.

### Changes

- [`core_version_check_query_args`](https://developer.wordpress.org/reference/hooks/core_version_check_query_args/) - Added <code>$extensions</code>, <code>$platform_flags</code>, and <code>$image_support</code> to the <code>$query</code> parameter.
- [`create_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/create_taxonomy/) - The <code>$args</code> parameter was added.
- [`create_term`](https://developer.wordpress.org/reference/hooks/create_term/) - The <code>$args</code> parameter was added.
- [`created_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/created_taxonomy/) - The <code>$args</code> parameter was added.
- [`created_term`](https://developer.wordpress.org/reference/hooks/created_term/) - The <code>$args</code> parameter was added.
- [`edit_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/edit_taxonomy/) - The <code>$args</code> parameter was added.
- [`edit_term_taxonomy`](https://developer.wordpress.org/reference/hooks/edit_term_taxonomy/) - The <code>$args</code> parameter was added.
- [`edit_term`](https://developer.wordpress.org/reference/hooks/edit_term/) - The <code>$args</code> parameter was added.
- [`edit_terms`](https://developer.wordpress.org/reference/hooks/edit_terms/) - The <code>$args</code> parameter was added.
- [`edited_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/edited_taxonomy/) - The <code>$args</code> parameter was added.
- [`edited_term_taxonomy`](https://developer.wordpress.org/reference/hooks/edited_term_taxonomy/) - The <code>$args</code> parameter was added.
- [`edited_term`](https://developer.wordpress.org/reference/hooks/edited_term/) - The <code>$args</code> parameter was added.
- [`edited_terms`](https://developer.wordpress.org/reference/hooks/edited_terms/) - The <code>$args</code> parameter was added.
- [`install_themes_{$tab}`](https://developer.wordpress.org/reference/hooks/install_themes_tab/) - Added the <code>install_themes_block-themes</code> hook name.
- [`install_themes_pre_{$tab}`](https://developer.wordpress.org/reference/hooks/install_themes_pre_tab/) - Added the <code>install_themes_pre_block-themes</code> hook name.
- [`nonce_life`](https://developer.wordpress.org/reference/hooks/nonce_life/) - Added <code>$action</code> argument to allow for more targeted filters.
- [`override_unload_textdomain`](https://developer.wordpress.org/reference/hooks/override_unload_textdomain/) - Added the <code>$reloadable</code> parameter.
- [`pre_insert_term`](https://developer.wordpress.org/reference/hooks/pre_insert_term/) - The <code>$args</code> parameter was added.
- [`saved_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/saved_taxonomy/) - The <code>$args</code> parameter was added.
- [`saved_term`](https://developer.wordpress.org/reference/hooks/saved_term/) - The <code>$args</code> parameter was added.
- [`term_id_filter`](https://developer.wordpress.org/reference/hooks/term_id_filter/) - The <code>$args</code> parameter was added.
- [`unload_textdomain`](https://developer.wordpress.org/reference/hooks/unload_textdomain/) - Added the <code>$reloadable</code> parameter.
- [`wp_sitemaps_posts_query_args`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_posts_query_args/) - Added <code>ignore_sticky_posts</code> default parameter.

## WordPress 6.0

### New Actions

- [`registered_post_type_{$post_type}`](https://developer.wordpress.org/reference/hooks/registered_post_type_post_type/) - Fires after a specific post type is registered.
- [`registered_taxonomy_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/registered_taxonomy_taxonomy/) - Fires after a specific taxonomy is registered.

### New Filters

- [`media_date_column_time`](https://developer.wordpress.org/reference/hooks/media_date_column_time/) - Filters the published time of an attachment displayed in the Media list table.
- [`plugin_install_description`](https://developer.wordpress.org/reference/hooks/plugin_install_description/) - Filters the plugin card description on the Add Plugins screen.
- [`pre_wp_filesize`](https://developer.wordpress.org/reference/hooks/pre_wp_filesize/) - Filters the result of wp_filesize() before the file_exists() PHP function is run.
- [`register_{$post_type}_post_type_args`](https://developer.wordpress.org/reference/hooks/register_post_type_post_type_args/) - Filters the arguments for registering a specific post type.
- [`register_{$taxonomy}_taxonomy_args`](https://developer.wordpress.org/reference/hooks/register_taxonomy_taxonomy_args/) - Filters the arguments for registering a specific taxonomy.
- [`retrieve_password_notification_email`](https://developer.wordpress.org/reference/hooks/retrieve_password_notification_email/) - Filters the contents of the reset password notification email sent to the user.
- [`send_retrieve_password_email`](https://developer.wordpress.org/reference/hooks/send_retrieve_password_email/) - Filters whether to send the retrieve password email.
- [`term_exists_default_query_args`](https://developer.wordpress.org/reference/hooks/term_exists_default_query_args/) - Filters default query arguments for checking if a term exists.
- [`the_author_link`](https://developer.wordpress.org/reference/hooks/the_author_link/) - Filters the author URL link HTML.
- [`wp_admin_bar_show_site_icons`](https://developer.wordpress.org/reference/hooks/wp_admin_bar_show_site_icons/) - Filters whether to show the site icons in toolbar.
- [`wp_allow_query_attachment_by_filename`](https://developer.wordpress.org/reference/hooks/wp_allow_query_attachment_by_filename/) (6.0.3) - Filters whether an attachment query should include filenames or not.
- [`wp_content_img_tag`](https://developer.wordpress.org/reference/hooks/wp_content_img_tag/) - Filters an img tag within the content for a given context.
- [`wp_filesize`](https://developer.wordpress.org/reference/hooks/wp_filesize/) - Filters the size of the file.
- [`wp_is_large_user_count`](https://developer.wordpress.org/reference/hooks/wp_is_large_user_count/) - Filters whether the site is considered large, based on its number of users.

### Changes

- [`rest_index`](https://developer.wordpress.org/reference/hooks/rest_index/) - Added <code>$request</code> parameter.
- [`wp_insert_attachment_data`](https://developer.wordpress.org/reference/hooks/wp_insert_attachment_data/) - The <code>$update</code> parameter was added.
- [`wp_insert_post_data`](https://developer.wordpress.org/reference/hooks/wp_insert_post_data/) - The <code>$update</code> parameter was added.
- [`wp_sitemaps_taxonomies_entry`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_taxonomies_entry/) - Added <code>$term</code> argument containing the term object.

## WordPress 5.9

### New Actions

- [`render_block_core_template_part_file`](https://developer.wordpress.org/reference/hooks/render_block_core_template_part_file/) - Fires when a block template part is loaded from a template part in the theme.
- [`render_block_core_template_part_none`](https://developer.wordpress.org/reference/hooks/render_block_core_template_part_none/) - Fires when a requested block template part does not exist in the database nor in the theme.
- [`render_block_core_template_part_post`](https://developer.wordpress.org/reference/hooks/render_block_core_template_part_post/) - Fires when a block template part is loaded from a template post stored in the database.
- [`rest_after_insert_nav_menu_item`](https://developer.wordpress.org/reference/hooks/rest_after_insert_nav_menu_item/) - Fires after a single menu item is completely created or updated via the REST API.
- [`rest_delete_nav_menu_item`](https://developer.wordpress.org/reference/hooks/rest_delete_nav_menu_item/) - Fires immediately after a single menu item is deleted via the REST API.
- [`rest_insert_nav_menu_item`](https://developer.wordpress.org/reference/hooks/rest_insert_nav_menu_item/) - Fires after a single menu item is created or updated via the REST API.
- [`wp_mail_succeeded`](https://developer.wordpress.org/reference/hooks/wp_mail_succeeded/) - Fires after PHPMailer has successfully sent an email.

### New Filters

- [`block_core_navigation_render_fallback`](https://developer.wordpress.org/reference/hooks/block_core_navigation_render_fallback/) - Filters the fallback experience for the Navigation block.
- [`default_template_types`](https://developer.wordpress.org/reference/hooks/default_template_types/) - Filters the list of default template types.
- [`default_wp_template_part_areas`](https://developer.wordpress.org/reference/hooks/default_wp_template_part_areas/) - Filters the list of allowed template part area values.
- [`get_block_file_template`](https://developer.wordpress.org/reference/hooks/get_block_file_template/) - Filters the block template object after it has been (potentially) fetched from the theme file.
- [`get_block_template`](https://developer.wordpress.org/reference/hooks/get_block_template/) - Filters the queried block template object after it's been fetched.
- [`get_block_templates`](https://developer.wordpress.org/reference/hooks/get_block_templates/) - Filters the array of queried block templates array after they've been fetched.
- [`get_header_image_tag_attributes`](https://developer.wordpress.org/reference/hooks/get_header_image_tag_attributes/) - Filters the list of header image attributes.
- [`http_allowed_safe_ports`](https://developer.wordpress.org/reference/hooks/http_allowed_safe_ports/) - Controls the list of ports considered safe in HTTP API.
- [`insert_custom_user_meta`](https://developer.wordpress.org/reference/hooks/insert_custom_user_meta/) - Filters a user's custom meta values and keys immediately after the user is created or updated and before any user meta is inserted or updated.
- [`is_post_status_viewable`](https://developer.wordpress.org/reference/hooks/is_post_status_viewable/) - Filters whether a post status is considered "viewable".
- [`is_post_type_viewable`](https://developer.wordpress.org/reference/hooks/is_post_type_viewable/) - Filters whether a post type is considered "viewable".
- [`login_display_language_dropdown`](https://developer.wordpress.org/reference/hooks/login_display_language_dropdown/) - Filters whether to display the Language selector on the login screen.
- [`login_language_dropdown_args`](https://developer.wordpress.org/reference/hooks/login_language_dropdown_args/) - Filters default arguments for the Language select input on the login screen.
- [`post_thumbnail_id`](https://developer.wordpress.org/reference/hooks/post_thumbnail_id/) - Filters the post thumbnail ID.
- [`post_thumbnail_url`](https://developer.wordpress.org/reference/hooks/post_thumbnail_url/) - Filters the post thumbnail URL.
- [`pre_get_block_file_template`](https://developer.wordpress.org/reference/hooks/pre_get_block_file_template/) - Filters the block template object before the theme file discovery takes place.
- [`pre_get_block_template`](https://developer.wordpress.org/reference/hooks/pre_get_block_template/) - Filters the block template object before the query takes place.
- [`pre_get_block_templates`](https://developer.wordpress.org/reference/hooks/pre_get_block_templates/) - Filters the block templates array before the query takes place.
- [`rest_pre_insert_nav_menu_item`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_nav_menu_item/) - Filters a menu item before it is inserted via the REST API.
- [`rest_prepare_menu_location`](https://developer.wordpress.org/reference/hooks/rest_prepare_menu_location/) - Filters menu location data returned from the REST API.
- [`rest_prepare_nav_menu_item`](https://developer.wordpress.org/reference/hooks/rest_prepare_nav_menu_item/) - Filters the menu item data for a REST API response.
- [`rest_prepare_url_details`](https://developer.wordpress.org/reference/hooks/rest_prepare_url_details/) - Filters the URL data for the response.
- [`rest_route_for_post_type_items`](https://developer.wordpress.org/reference/hooks/rest_route_for_post_type_items/) - Filters the REST API route for a post type.
- [`rest_route_for_taxonomy_items`](https://developer.wordpress.org/reference/hooks/rest_route_for_taxonomy_items/) - Filters the REST API route for a taxonomy.
- [`rest_url_details_cache_expiration`](https://developer.wordpress.org/reference/hooks/rest_url_details_cache_expiration/) - Filters the cache expiration.
- [`rest_url_details_http_request_args`](https://developer.wordpress.org/reference/hooks/rest_url_details_http_request_args/) - Filters the HTTP request args for URL data retrieval.
- [`rss_widget_feed_link`](https://developer.wordpress.org/reference/hooks/rss_widget_feed_link/) - Filters the classic RSS widget's feed icon link.
- [`wp_omit_loading_attr_threshold`](https://developer.wordpress.org/reference/hooks/wp_omit_loading_attr_threshold/) - Filters the threshold for how many of the first content media elements to not lazy-load.

### Changes

- [`{$new_status}_{$post->post_type}`](https://developer.wordpress.org/reference/hooks/new_status_post-post_type/) - Added <code>$old_status</code> parameter.
- [`pre_render_block`](https://developer.wordpress.org/reference/hooks/pre_render_block/) - The <code>$parent_block</code> parameter was added.
- [`registration_redirect`](https://developer.wordpress.org/reference/hooks/registration_redirect/) - Added the <code>$errors</code> parameter.
- [`render_block_{$this->name}`](https://developer.wordpress.org/reference/hooks/render_block_this-name/) - The <code>$instance</code> parameter was added.
- [`render_block_context`](https://developer.wordpress.org/reference/hooks/render_block_context/) - The <code>$parent_block</code> parameter was added.
- [`render_block_data`](https://developer.wordpress.org/reference/hooks/render_block_data/) - The <code>$parent_block</code> parameter was added.
- [`render_block`](https://developer.wordpress.org/reference/hooks/render_block/) - The <code>$instance</code> parameter was added.

## WordPress 5.8

### New Actions

- [`delete_theme`](https://developer.wordpress.org/reference/hooks/delete_theme/) - Fires immediately before a theme deletion attempt.
- [`deleted_theme`](https://developer.wordpress.org/reference/hooks/deleted_theme/) - Fires immediately after a theme deletion attempt.
- [`rest_after_save_widget`](https://developer.wordpress.org/reference/hooks/rest_after_save_widget/) - Fires after a widget is created or updated via the REST API.
- [`rest_delete_widget`](https://developer.wordpress.org/reference/hooks/rest_delete_widget/) - Fires after a widget is deleted via the REST API.
- [`rest_save_sidebar`](https://developer.wordpress.org/reference/hooks/rest_save_sidebar/) - Fires after a sidebar is updated via the REST API.
- [`site_health_tab_content`](https://developer.wordpress.org/reference/hooks/site_health_tab_content/) - Fires when outputting the content of a custom Site Health tab.

### New Filters

- [`allowed_block_types_all`](https://developer.wordpress.org/reference/hooks/allowed_block_types_all/) - Filters the allowed block types for all editor types.
- [`block_categories_all`](https://developer.wordpress.org/reference/hooks/block_categories_all/) - Filters the default array of categories for block types.
- [`block_editor_rest_api_preload_paths`](https://developer.wordpress.org/reference/hooks/block_editor_rest_api_preload_paths/) - Filters the array of REST API paths that will be used to preloaded common data for the block editor.
- [`block_editor_settings_all`](https://developer.wordpress.org/reference/hooks/block_editor_settings_all/) - Filters the settings to pass to the block editor for all editor type.
- [`document_title`](https://developer.wordpress.org/reference/hooks/document_title/) - Filters the document title.
- [`enable_loading_object_cache_dropin`](https://developer.wordpress.org/reference/hooks/enable_loading_object_cache_dropin/) - Filters whether to enable loading of the object-cache.php drop-in.
- [`excerpt_allowed_wrapper_blocks`](https://developer.wordpress.org/reference/hooks/excerpt_allowed_wrapper_blocks/) - Filters the list of blocks that can be used as wrapper blocks, allowing excerpts to be generated from the `innerBlocks` of these wrappers.
- [`image_editor_output_format`](https://developer.wordpress.org/reference/hooks/image_editor_output_format/) - Filters the image editor output format mapping.
- [`media_library_infinite_scrolling`](https://developer.wordpress.org/reference/hooks/media_library_infinite_scrolling/) - Filters whether the Media Library grid has infinite scrolling. Default `true`.
- [`rest_pattern_directory_collection_params`](https://developer.wordpress.org/reference/hooks/rest_pattern_directory_collection_params/) - Filter collection parameters for the block pattern directory controller.
- [`rest_prepare_block_pattern`](https://developer.wordpress.org/reference/hooks/rest_prepare_block_pattern/) - Filters the REST API response for a block pattern.
- [`rest_prepare_sidebar`](https://developer.wordpress.org/reference/hooks/rest_prepare_sidebar/) - Filters the REST API response for a sidebar.
- [`rest_prepare_widget`](https://developer.wordpress.org/reference/hooks/rest_prepare_widget/) - Filters the REST API response for a widget.
- [`rest_prepare_widget_type`](https://developer.wordpress.org/reference/hooks/rest_prepare_widget_type/) - Filters the REST API response for a widget type.
- [`should_load_remote_block_patterns`](https://developer.wordpress.org/reference/hooks/should_load_remote_block_patterns/) - Filter to disable remote block patterns.
- [`should_load_separate_core_block_assets`](https://developer.wordpress.org/reference/hooks/should_load_separate_core_block_assets/) - Filters whether block styles should be loaded separately.
- [`site_health_navigation_tabs`](https://developer.wordpress.org/reference/hooks/site_health_navigation_tabs/) - Filters the extra tabs for the Site Health navigation bar.
- [`styles_inline_size_limit`](https://developer.wordpress.org/reference/hooks/styles_inline_size_limit/) - The maximum size of inlined styles in bytes.
- [`update_plugins_{$hostname}`](https://developer.wordpress.org/reference/hooks/update_plugins_hostname/) - Filters the update response for a given plugin hostname.
- [`use_widgets_block_editor`](https://developer.wordpress.org/reference/hooks/use_widgets_block_editor/) - Filters whether to use the block editor to manage widgets.
- [`user_erasure_fulfillment_email_content`](https://developer.wordpress.org/reference/hooks/user_erasure_fulfillment_email_content/) - Filters the body of the data erasure fulfillment notification.
- [`user_erasure_fulfillment_email_headers`](https://developer.wordpress.org/reference/hooks/user_erasure_fulfillment_email_headers/) - Filters the headers of the data erasure fulfillment notification.
- [`user_erasure_fulfillment_email_subject`](https://developer.wordpress.org/reference/hooks/user_erasure_fulfillment_email_subject/) - Filters the subject of the email sent when an erasure request is completed.
- [`user_request_confirmed_email_content`](https://developer.wordpress.org/reference/hooks/user_request_confirmed_email_content/) - Filters the body of the user request confirmation email.
- [`widget_block_content`](https://developer.wordpress.org/reference/hooks/widget_block_content/) - Filters the content of the Block widget before output.
- [`widget_block_dynamic_classname`](https://developer.wordpress.org/reference/hooks/widget_block_dynamic_classname/) - The classname used in the block widget's container HTML.
- [`widget_types_to_hide_from_legacy_widget_block`](https://developer.wordpress.org/reference/hooks/widget_types_to_hide_from_legacy_widget_block/) - Filters the list of widget-type IDs that should **not** be offered by the Legacy Widget block.
- [`wp_{$post->post_type}_revisions_to_keep`](https://developer.wordpress.org/reference/hooks/wp_post-post_type_revisions_to_keep/) - Filters the number of revisions to save for the given post by its post type.

### Changes

- [`admin_url`](https://developer.wordpress.org/reference/hooks/admin_url/) - The <code>$scheme</code> parameter was added.
- [`image_sideload_extensions`](https://developer.wordpress.org/reference/hooks/image_sideload_extensions/) - Added 'webp' to the default list of allowed file extensions.
- [`includes_url`](https://developer.wordpress.org/reference/hooks/includes_url/) - The <code>$scheme</code> parameter was added.
- [`insert_user_meta`](https://developer.wordpress.org/reference/hooks/insert_user_meta/) - The <code>$userdata</code> parameter was added.
- [`network_admin_url`](https://developer.wordpress.org/reference/hooks/network_admin_url/) - The <code>$scheme</code> parameter was added.
- [`profile_update`](https://developer.wordpress.org/reference/hooks/profile_update/) - The <code>$userdata</code> parameter was added.
- [`the_password_form`](https://developer.wordpress.org/reference/hooks/the_password_form/) - Added the <code>$post</code> parameter.
- [`user_admin_url`](https://developer.wordpress.org/reference/hooks/user_admin_url/) - The <code>$scheme</code> parameter was added.
- [`user_register`](https://developer.wordpress.org/reference/hooks/user_register/) - The <code>$userdata</code> parameter was added.
- [`wp_pre_insert_user_data`](https://developer.wordpress.org/reference/hooks/wp_pre_insert_user_data/) - The <code>$userdata</code> parameter was added.
- [`wp_unique_filename`](https://developer.wordpress.org/reference/hooks/wp_unique_filename/) (5.8.1) - The <code>$alt_filenames</code> and <code>$number</code> parameters were added.
- [`write_your_story`](https://developer.wordpress.org/reference/hooks/write_your_story/) - Changed the default placeholder text.

## WordPress 5.7

### New Actions

- [`manage_{$this->screen->id}_custom_column`](https://developer.wordpress.org/reference/hooks/manage_this-screen-id_custom_column/) - Fires for each custom column of a specific request type in the Privacy Requests list table.

### New Filters

- [`block_type_metadata`](https://developer.wordpress.org/reference/hooks/block_type_metadata/) - Filters the metadata provided for registering a block type.
- [`block_type_metadata_settings`](https://developer.wordpress.org/reference/hooks/block_type_metadata_settings/) - Filters the settings determined from the block type metadata.
- [`login_site_html_link`](https://developer.wordpress.org/reference/hooks/login_site_html_link/) - Filters the "Go to site" link displayed in the login page footer.
- [`lostpassword_user_data`](https://developer.wordpress.org/reference/hooks/lostpassword_user_data/) - Filters the user data during a password reset request.
- [`paginate_links_output`](https://developer.wordpress.org/reference/hooks/paginate_links_output/) - Filters the HTML output of paginated links for archives.
- [`pre_months_dropdown_query`](https://developer.wordpress.org/reference/hooks/pre_months_dropdown_query/) - Filters whether to short-circuit performing the months dropdown query.
- [`pre_wp_mail`](https://developer.wordpress.org/reference/hooks/pre_wp_mail/) - Filters whether to preempt sending an email.
- [`render_block_{$this->name}`](https://developer.wordpress.org/reference/hooks/render_block_this-name/) - Filters the content of a single block.
- [`the_title_export`](https://developer.wordpress.org/reference/hooks/the_title_export/) - Filters the post title used for WXR exports.
- [`update_post_term_count_statuses`](https://developer.wordpress.org/reference/hooks/update_post_term_count_statuses/) - Filters the post statuses for updating the term count.
- [`upgrader_install_package_result`](https://developer.wordpress.org/reference/hooks/upgrader_install_package_result/) - Filters the result of WP_Upgrader::install_package().
- [`wp_direct_update_https_url`](https://developer.wordpress.org/reference/hooks/wp_direct_update_https_url/) - Filters the URL for directly updating the PHP version the site is running on from the host.
- [`wp_iframe_tag_add_loading_attr`](https://developer.wordpress.org/reference/hooks/wp_iframe_tag_add_loading_attr/) - Filters the `loading` attribute value to add to an iframe. Default 'lazy'.
- [`wp_image_src_get_dimensions`](https://developer.wordpress.org/reference/hooks/wp_image_src_get_dimensions/) - Filters the wp_image_src_get_dimensions() value.
- [`wp_inline_script_attributes`](https://developer.wordpress.org/reference/hooks/wp_inline_script_attributes/) - Filters attributes to be added to a script tag.
- [`wp_list_table_show_post_checkbox`](https://developer.wordpress.org/reference/hooks/wp_list_table_show_post_checkbox/) - Filters whether to show the bulk edit checkbox for a post in its list table.
- [`wp_robots`](https://developer.wordpress.org/reference/hooks/wp_robots/) - Filters the directives to be included in the 'robots' meta tag.
- [`wp_script_attributes`](https://developer.wordpress.org/reference/hooks/wp_script_attributes/) - Filters attributes to be added to a script tag.
- [`wp_should_replace_insecure_home_url`](https://developer.wordpress.org/reference/hooks/wp_should_replace_insecure_home_url/) - Filters whether WordPress should replace old HTTP URLs to the site with their HTTPS counterpart.
- [`wp_update_https_url`](https://developer.wordpress.org/reference/hooks/wp_update_https_url/) - Filters the URL to learn more about updating the HTTPS version the site is running on.
- [`{$action}_overrides`](https://developer.wordpress.org/reference/hooks/action_overrides/) - Filters the override parameters for a file before it is uploaded to WordPress.

### Changes

- [`get_post_status`](https://developer.wordpress.org/reference/hooks/get_post_status/) - The attachment post type is now passed through this filter.
- [`pre_clear_scheduled_hook`](https://developer.wordpress.org/reference/hooks/pre_clear_scheduled_hook/) - The <code>$wp_error</code> parameter was added, and a WP_Error object can now be returned.
- [`pre_reschedule_event`](https://developer.wordpress.org/reference/hooks/pre_reschedule_event/) - The <code>$wp_error</code> parameter was added, and a WP_Error object can now be returned.
- [`pre_schedule_event`](https://developer.wordpress.org/reference/hooks/pre_schedule_event/) - The <code>$wp_error</code> parameter was added, and a WP_Error object can now be returned.
- [`pre_unschedule_event`](https://developer.wordpress.org/reference/hooks/pre_unschedule_event/) - The <code>$wp_error</code> parameter was added, and a WP_Error object can now be returned.
- [`pre_unschedule_hook`](https://developer.wordpress.org/reference/hooks/pre_unschedule_hook/) - The <code>$wp_error</code> parameter was added, and a WP_Error object can now be returned.
- [`rest_{$this->post_type}_query`](https://developer.wordpress.org/reference/hooks/rest_this-post_type_query/) - Moved after the <code>tax_query</code> query arg is generated.
- [`xmlrpc_call`](https://developer.wordpress.org/reference/hooks/xmlrpc_call/) - Added the <code>$args</code> and <code>$server</code> parameters.

## WordPress 5.6

### New Actions

- [`after_core_auto_updates_settings`](https://developer.wordpress.org/reference/hooks/after_core_auto_updates_settings/) - Fires after the major core auto-update settings.
- [`application_password_did_authenticate`](https://developer.wordpress.org/reference/hooks/application_password_did_authenticate/) - Fires after an application password was used for authentication.
- [`application_password_failed_authentication`](https://developer.wordpress.org/reference/hooks/application_password_failed_authentication/) - Fires when an application password failed to authenticate the user.
- [`do_all_pings`](https://developer.wordpress.org/reference/hooks/do_all_pings/) - Fires immediately after the `do_pings` event to hook services individually.
- [`is_wp_error_instance`](https://developer.wordpress.org/reference/hooks/is_wp_error_instance/) - Fires when `is_wp_error()` is called and its parameter is an instance of WP_Error.
- [`manage_{$this->screen->id}_custom_column`](https://developer.wordpress.org/reference/hooks/manage_this-screen-id_custom_column/) - Fires for each custom column in the Application Passwords list table.
- [`manage_{$this->screen->id}_custom_column_js_template`](https://developer.wordpress.org/reference/hooks/manage_this-screen-id_custom_column_js_template/) - Fires in the JavaScript row template for each custom column in the Application Passwords list table.
- [`network_site_info_form`](https://developer.wordpress.org/reference/hooks/network_site_info_form/) - Fires at the end of the site info form in network admin.
- [`rest_after_insert_application_password`](https://developer.wordpress.org/reference/hooks/rest_after_insert_application_password/) - Fires after a single application password is completely created or updated via the REST API.
- [`wp_after_insert_post`](https://developer.wordpress.org/reference/hooks/wp_after_insert_post/) - Fires once a post, its terms and meta data has been saved.
- [`wp_authenticate_application_password_errors`](https://developer.wordpress.org/reference/hooks/wp_authenticate_application_password_errors/) - Fires when an application password has been successfully checked as valid.
- [`wp_authorize_application_password_form`](https://developer.wordpress.org/reference/hooks/wp_authorize_application_password_form/) - Fires in the Authorize Application Password form before the submit buttons.
- [`wp_authorize_application_password_form_approved_no_js`](https://developer.wordpress.org/reference/hooks/wp_authorize_application_password_form_approved_no_js/) - Fires in the Authorize Application Password new password section in the no-JS version.
- [`wp_authorize_application_password_request_errors`](https://developer.wordpress.org/reference/hooks/wp_authorize_application_password_request_errors/) - Fires before application password errors are returned.
- [`wp_create_application_password`](https://developer.wordpress.org/reference/hooks/wp_create_application_password/) - Fires when an application password is created.
- [`wp_create_application_password_form`](https://developer.wordpress.org/reference/hooks/wp_create_application_password_form/) - Fires in the create Application Passwords form.
- [`wp_delete_application_password`](https://developer.wordpress.org/reference/hooks/wp_delete_application_password/) - Fires when an application password is deleted.
- [`wp_error_added`](https://developer.wordpress.org/reference/hooks/wp_error_added/) - Fires when an error is added to a WP_Error object.
- [`wp_update_application_password`](https://developer.wordpress.org/reference/hooks/wp_update_application_password/) - Fires when an application password is updated.

### New Filters

- [`application_password_is_api_request`](https://developer.wordpress.org/reference/hooks/application_password_is_api_request/) - Filters whether this is an API request that Application Passwords can be used on.
- [`block_default_classname`](https://developer.wordpress.org/reference/hooks/block_default_classname/) - Filters the default block className for server rendered blocks.
- [`comments_template_top_level_query_args`](https://developer.wordpress.org/reference/hooks/comments_template_top_level_query_args/) - Filters the arguments used in the top level comments query.
- [`email_exists`](https://developer.wordpress.org/reference/hooks/email_exists/) - Filters whether the given email exists.
- [`image_sideload_extensions`](https://developer.wordpress.org/reference/hooks/image_sideload_extensions/) - Filters the list of allowed file extensions when sideloading an image from a URL.
- [`invited_user_email`](https://developer.wordpress.org/reference/hooks/invited_user_email/) - Filters the contents of the email sent when an existing user is invited to join the site.
- [`new_site_email`](https://developer.wordpress.org/reference/hooks/new_site_email/) - Filters the content of the email sent to the Multisite network administrator when a new site is created.
- [`pre_recurse_dirsize`](https://developer.wordpress.org/reference/hooks/pre_recurse_dirsize/) - Filters the amount of storage space used by one directory and all its children, in megabytes.
- [`quick_edit_dropdown_authors_args`](https://developer.wordpress.org/reference/hooks/quick_edit_dropdown_authors_args/) - Filters the arguments used to generate the Quick Edit authors drop-down.
- [`rest_get_max_batch_size`](https://developer.wordpress.org/reference/hooks/rest_get_max_batch_size/) - Filters the maximum number of REST API requests that can be included in a batch.
- [`rest_post_format_search_query`](https://developer.wordpress.org/reference/hooks/rest_post_format_search_query/) - Filters the query arguments for a REST API post format search request.
- [`rest_pre_insert_application_password`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_application_password/) - Filters an application password before it is inserted via the REST API.
- [`rest_prepare_application_password`](https://developer.wordpress.org/reference/hooks/rest_prepare_application_password/) - Filters the REST API response for an application password.
- [`rest_term_search_query`](https://developer.wordpress.org/reference/hooks/rest_term_search_query/) - Filters the query arguments for a REST API term search request.
- [`send_new_site_email`](https://developer.wordpress.org/reference/hooks/send_new_site_email/) - Filters whether to send an email to the Multisite network administrator when a new site is created.
- [`should_load_block_editor_scripts_and_styles`](https://developer.wordpress.org/reference/hooks/should_load_block_editor_scripts_and_styles/) - Filters the flag that decides whether or not block editor scripts and styles are going to be enqueued on the current screen.
- [`site_health_test_rest_capability_{$check}`](https://developer.wordpress.org/reference/hooks/site_health_test_rest_capability_check/) - Filters the capability needed to run a given Site Health check.
- [`wp_get_attachment_image`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_image/) - Filters the HTML img element representing an image attachment.
- [`wp_installed_email`](https://developer.wordpress.org/reference/hooks/wp_installed_email/) - Filters the contents of the email sent to the site administrator when WordPress is installed.
- [`wp_is_application_passwords_available`](https://developer.wordpress.org/reference/hooks/wp_is_application_passwords_available/) - Filters whether Application Passwords is available.
- [`wp_is_application_passwords_available_for_user`](https://developer.wordpress.org/reference/hooks/wp_is_application_passwords_available_for_user/) - Filters whether Application Passwords is available for a specific user.
- [`wp_is_site_protected_by_basic_auth`](https://developer.wordpress.org/reference/hooks/wp_is_site_protected_by_basic_auth/) (5.6.1) - Filters whether a site is protected by HTTP Basic Auth.
- [`wp_untrash_post_status`](https://developer.wordpress.org/reference/hooks/wp_untrash_post_status/) - Filters the status that a post gets assigned when it is restored from the trash (untrashed).

### Changes

- [`attachment_link`](https://developer.wordpress.org/reference/hooks/attachment_link/) - Providing an empty string will now disable the view attachment page link on the media modal.
- [`bulk_actions-{$this->screen->id}`](https://developer.wordpress.org/reference/hooks/bulk_actions-this-screen-id/) - A bulk action can now contain an array of options in order to create an optgroup.
- [`comments_pre_query`](https://developer.wordpress.org/reference/hooks/comments_pre_query/) - The returned array of comment data is assigned to the <code>comments</code> property of the current WP_Comment_Query instance.
- [`image_send_to_editor`](https://developer.wordpress.org/reference/hooks/image_send_to_editor/) - The <code>$rel</code> parameter was added.
- [`manage_comments_nav`](https://developer.wordpress.org/reference/hooks/manage_comments_nav/) - The <code>$which</code> parameter was added.
- [`networks_pre_query`](https://developer.wordpress.org/reference/hooks/networks_pre_query/) - The returned array of network data is assigned to the <code>networks</code> property of the current WP_Network_Query instance.
- [`pre_untrash_post`](https://developer.wordpress.org/reference/hooks/pre_untrash_post/) - Added the <code>$previous_status</code> parameter.
- [`preprocess_comment`](https://developer.wordpress.org/reference/hooks/preprocess_comment/) - Comment data includes the <code>comment_agent</code> and <code>comment_author_IP</code> values.
- [`quick_edit_dropdown_pages_args`](https://developer.wordpress.org/reference/hooks/quick_edit_dropdown_pages_args/) - The <code>$bulk</code> parameter was added.
- [`recovery_mode_email`](https://developer.wordpress.org/reference/hooks/recovery_mode_email/) - The <code>$email</code> argument includes the <code>attachments</code> key.
- [`site_status_tests`](https://developer.wordpress.org/reference/hooks/site_status_tests/) - Added the <code>async_direct_test</code> array key for asynchronous tests. Added the <code>skip_cron</code> array key for all tests.
- [`sites_pre_query`](https://developer.wordpress.org/reference/hooks/sites_pre_query/) - The returned array of site data is assigned to the <code>sites</code> property of the current WP_Site_Query instance.
- [`untrash_post`](https://developer.wordpress.org/reference/hooks/untrash_post/) - Added the <code>$previous_status</code> parameter.
- [`untrashed_post`](https://developer.wordpress.org/reference/hooks/untrashed_post/) - Added the <code>$previous_status</code> parameter.
- [`wp_authorize_application_password_form_approved_no_js`](https://developer.wordpress.org/reference/hooks/wp_authorize_application_password_form_approved_no_js/) (5.6.1) - Corrected action name and signature.

## WordPress 5.5

### New Actions

- [`customize_controls_head`](https://developer.wordpress.org/reference/hooks/customize_controls_head/) - Fires in head section of Customizer controls.
- [`register_setting`](https://developer.wordpress.org/reference/hooks/register_setting/) - Fires immediately before the setting is registered but after its filters are in place.
- [`saved_term`](https://developer.wordpress.org/reference/hooks/saved_term/) - Fires after a term has been saved, and the term cache has been cleared.
- [`saved_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/saved_taxonomy/) - Fires after a term in a specific taxonomy has been saved, and the term cache has been cleared.
- [`set_404`](https://developer.wordpress.org/reference/hooks/set_404/) - Fires after a 404 is triggered.
- [`unregister_setting`](https://developer.wordpress.org/reference/hooks/unregister_setting/) - Fires immediately before the setting is unregistered and after its filters have been removed.
- [`upgrader_overwrote_package`](https://developer.wordpress.org/reference/hooks/upgrader_overwrote_package/) - Fires when the upgrader has successfully overwritten a currently installed plugin or theme with an uploaded zip package.
- [`wp_check_comment_disallowed_list`](https://developer.wordpress.org/reference/hooks/wp_check_comment_disallowed_list/) - Fires before the comment is tested for disallowed characters or words.
- [`wp_media_attach_action`](https://developer.wordpress.org/reference/hooks/wp_media_attach_action/) - Fires when media is attached or detached from a post.
- [`wp_sitemaps_init`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_init/) - Fires when initializing the Sitemaps object.

### New Filters

- [`admin_viewport_meta`](https://developer.wordpress.org/reference/hooks/admin_viewport_meta/) - Filters the viewport meta in the admin.
- [`allowed_options`](https://developer.wordpress.org/reference/hooks/allowed_options/) - Filters the allowed options list.
- [`auto_plugin_theme_update_email`](https://developer.wordpress.org/reference/hooks/auto_plugin_theme_update_email/) - Filters the email sent following an automatic background update for plugins and themes.
- [`auto_plugin_update_send_email`](https://developer.wordpress.org/reference/hooks/auto_plugin_update_send_email/) - Filters whether to send an email following an automatic background plugin update.
- [`auto_theme_update_send_email`](https://developer.wordpress.org/reference/hooks/auto_theme_update_send_email/) - Filters whether to send an email following an automatic background theme update.
- [`default_category_post_types`](https://developer.wordpress.org/reference/hooks/default_category_post_types/) - Filters post types (in addition to 'post') that require a default category.
- [`default_{$meta_type}_metadata`](https://developer.wordpress.org/reference/hooks/default_meta_type_metadata/) - Filters the default metadata value for a specified meta key and object.
- [`do_redirect_guess_404_permalink`](https://developer.wordpress.org/reference/hooks/do_redirect_guess_404_permalink/) - Filters whether to attempt to guess a redirect URL for a 404 request.
- [`esc_xml`](https://developer.wordpress.org/reference/hooks/esc_xml/) - Filters a string cleaned and escaped for output in XML.
- [`get_custom_logo_image_attributes`](https://developer.wordpress.org/reference/hooks/get_custom_logo_image_attributes/) - Filters the list of custom logo image attributes.
- [`get_page_of_comment_query_args`](https://developer.wordpress.org/reference/hooks/get_page_of_comment_query_args/) - Filters the arguments used to query comments in get_page_of_comment().
- [`get_the_archive_title_prefix`](https://developer.wordpress.org/reference/hooks/get_the_archive_title_prefix/) - Filters the archive title prefix.
- [`gettext_with_context_{$domain}`](https://developer.wordpress.org/reference/hooks/gettext_with_context_domain/) - Filters text with its translation based on context information for a domain.
- [`gettext_{$domain}`](https://developer.wordpress.org/reference/hooks/gettext_domain/) - Filters text with its translation for a domain.
- [`install_plugin_overwrite_actions`](https://developer.wordpress.org/reference/hooks/install_plugin_overwrite_actions/) - Filters the list of action links available following a single plugin installation failure when overwriting is allowed.
- [`install_plugin_overwrite_comparison`](https://developer.wordpress.org/reference/hooks/install_plugin_overwrite_comparison/) - Filters the compare table output for overwriting a plugin package on upload.
- [`install_theme_overwrite_actions`](https://developer.wordpress.org/reference/hooks/install_theme_overwrite_actions/) - Filters the list of action links available following a single theme installation failure when overwriting is allowed.
- [`install_theme_overwrite_comparison`](https://developer.wordpress.org/reference/hooks/install_theme_overwrite_comparison/) - Filters the compare table output for overwriting a theme package on upload.
- [`lostpassword_errors`](https://developer.wordpress.org/reference/hooks/lostpassword_errors/) - Filters the errors encountered on a password reset request.
- [`navigation_widgets_format`](https://developer.wordpress.org/reference/hooks/navigation_widgets_format/) - Filters the HTML format of widgets with navigation links.
- [`ngettext_with_context_{$domain}`](https://developer.wordpress.org/reference/hooks/ngettext_with_context_domain/) - Filters the singular or plural form of a string with gettext context for a domain.
- [`ngettext_{$domain}`](https://developer.wordpress.org/reference/hooks/ngettext_domain/) - Filters the singular or plural form of a string for a domain.
- [`plugin_auto_update_debug_string`](https://developer.wordpress.org/reference/hooks/plugin_auto_update_debug_string/) - Filters the text string of the auto-updates setting for each plugin in the Site Health debug data.
- [`plugin_auto_update_setting_html`](https://developer.wordpress.org/reference/hooks/plugin_auto_update_setting_html/) - Filters the HTML of the auto-updates setting for each plugin in the Plugins list table.
- [`plugins_auto_update_enabled`](https://developer.wordpress.org/reference/hooks/plugins_auto_update_enabled/) - Filters whether plugins auto-update is enabled.
- [`pre_delete_attachment`](https://developer.wordpress.org/reference/hooks/pre_delete_attachment/) - Filters whether an attachment deletion should take place.
- [`pre_redirect_guess_404_permalink`](https://developer.wordpress.org/reference/hooks/pre_redirect_guess_404_permalink/) - Short-circuits the redirect URL guessing for 404 requests.
- [`pre_wp_unique_filename_file_list`](https://developer.wordpress.org/reference/hooks/pre_wp_unique_filename_file_list/) - Filters the file list used for calculating a unique filename for a newly added file.
- [`register_block_type_args`](https://developer.wordpress.org/reference/hooks/register_block_type_args/) - Filters the arguments for registering a block type.
- [`render_block_context`](https://developer.wordpress.org/reference/hooks/render_block_context/) - Filters the default context provided to a rendered block.
- [`rest_allowed_cors_headers`](https://developer.wordpress.org/reference/hooks/rest_allowed_cors_headers/) - Filters the list of request headers that are allowed for REST API CORS requests.
- [`rest_block_directory_collection_params`](https://developer.wordpress.org/reference/hooks/rest_block_directory_collection_params/) - Filters REST API collection parameters for the block directory controller.
- [`rest_exposed_cors_headers`](https://developer.wordpress.org/reference/hooks/rest_exposed_cors_headers/) - Filters the list of response headers that are exposed to REST API CORS requests.
- [`rest_prepare_block_type`](https://developer.wordpress.org/reference/hooks/rest_prepare_block_type/) - Filters a block type returned from the REST API.
- [`rest_prepare_plugin`](https://developer.wordpress.org/reference/hooks/rest_prepare_plugin/) - Filters plugin data for a REST API response.
- [`rest_queried_resource_route`](https://developer.wordpress.org/reference/hooks/rest_queried_resource_route/) - Filters the REST route for the currently queried object.
- [`rest_route_for_post`](https://developer.wordpress.org/reference/hooks/rest_route_for_post/) - Filters the REST API route for a post.
- [`rest_route_for_term`](https://developer.wordpress.org/reference/hooks/rest_route_for_term/) - Filters the REST API route for a term.
- [`safecss_filter_attr_allow_css`](https://developer.wordpress.org/reference/hooks/safecss_filter_attr_allow_css/) - Filters the check for unsafe CSS in `safecss_filter_attr`.
- [`strict_redirect_guess_404_permalink`](https://developer.wordpress.org/reference/hooks/strict_redirect_guess_404_permalink/) - Filters whether to perform a strict guess for a 404 redirect.
- [`theme_auto_update_debug_string`](https://developer.wordpress.org/reference/hooks/theme_auto_update_debug_string/) - Filters the text string of the auto-updates setting for each theme in the Site Health debug data.
- [`theme_auto_update_setting_html`](https://developer.wordpress.org/reference/hooks/theme_auto_update_setting_html/) - Filters the HTML of the auto-updates setting for each theme in the Themes list table.
- [`theme_auto_update_setting_template`](https://developer.wordpress.org/reference/hooks/theme_auto_update_setting_template/) - Filters the JavaScript template used to display the auto-update setting for a theme (in the overlay).
- [`themes_auto_update_enabled`](https://developer.wordpress.org/reference/hooks/themes_auto_update_enabled/) - Filters whether themes auto-update is enabled.
- [`wp_edited_image_metadata`](https://developer.wordpress.org/reference/hooks/wp_edited_image_metadata/) - Filters the meta data for the new image created by editing an existing image.
- [`wp_image_file_matches_image_meta`](https://developer.wordpress.org/reference/hooks/wp_image_file_matches_image_meta/) - Filters whether an image path or URI matches image meta.
- [`wp_img_tag_add_loading_attr`](https://developer.wordpress.org/reference/hooks/wp_img_tag_add_loading_attr/) - Filters the `loading` attribute value to add to an image. Default 'lazy'.
- [`wp_img_tag_add_srcset_and_sizes_attr`](https://developer.wordpress.org/reference/hooks/wp_img_tag_add_srcset_and_sizes_attr/) - Filters whether to add the `srcset` and `sizes` HTML attributes to the img tag. Default `true`.
- [`wp_img_tag_add_width_and_height_attr`](https://developer.wordpress.org/reference/hooks/wp_img_tag_add_width_and_height_attr/) - Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.
- [`wp_lazy_loading_enabled`](https://developer.wordpress.org/reference/hooks/wp_lazy_loading_enabled/) - Filters whether to add the `loading` attribute to the specified tag in the specified context.
- [`wp_opcache_invalidate_file`](https://developer.wordpress.org/reference/hooks/wp_opcache_invalidate_file/) - Filters whether to invalidate a file from the opcode cache.
- [`wp_sitemaps_add_provider`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_add_provider/) - Filters the sitemap provider before it is added.
- [`wp_sitemaps_enabled`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_enabled/) - Filters whether XML Sitemaps are enabled or not.
- [`wp_sitemaps_index_entry`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_index_entry/) - Filters the sitemap entry for the sitemap index.
- [`wp_sitemaps_max_urls`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_max_urls/) - Filters the maximum number of URLs displayed on a sitemap.
- [`wp_sitemaps_post_types`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_post_types/) - Filters the list of post object sub types available within the sitemap.
- [`wp_sitemaps_posts_entry`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_posts_entry/) - Filters the sitemap entry for an individual post.
- [`wp_sitemaps_posts_pre_max_num_pages`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_posts_pre_max_num_pages/) - Filters the max number of pages before it is generated.
- [`wp_sitemaps_posts_pre_url_list`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_posts_pre_url_list/) - Filters the posts URL list before it is generated.
- [`wp_sitemaps_posts_query_args`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_posts_query_args/) - Filters the query arguments for post type sitemap queries.
- [`wp_sitemaps_posts_show_on_front_entry`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_posts_show_on_front_entry/) - Filters the sitemap entry for the home page when the 'show_on_front' option equals 'posts'.
- [`wp_sitemaps_stylesheet_content`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_stylesheet_content/) - Filters the content of the sitemap stylesheet.
- [`wp_sitemaps_stylesheet_css`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_stylesheet_css/) - Filters the CSS only for the sitemap stylesheet.
- [`wp_sitemaps_stylesheet_index_content`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_stylesheet_index_content/) - Filters the content of the sitemap index stylesheet.
- [`wp_sitemaps_stylesheet_index_url`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_stylesheet_index_url/) - Filters the URL for the sitemap index stylesheet.
- [`wp_sitemaps_stylesheet_url`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_stylesheet_url/) - Filters the URL for the sitemap stylesheet.
- [`wp_sitemaps_taxonomies`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_taxonomies/) - Filters the list of taxonomy object subtypes available within the sitemap.
- [`wp_sitemaps_taxonomies_entry`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_taxonomies_entry/) - Filters the sitemap entry for an individual term.
- [`wp_sitemaps_taxonomies_pre_max_num_pages`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_taxonomies_pre_max_num_pages/) - Filters the max number of pages for a taxonomy sitemap before it is generated.
- [`wp_sitemaps_taxonomies_pre_url_list`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_taxonomies_pre_url_list/) - Filters the taxonomies URL list before it is generated.
- [`wp_sitemaps_taxonomies_query_args`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_taxonomies_query_args/) - Filters the taxonomy terms query arguments.
- [`wp_sitemaps_users_entry`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_users_entry/) - Filters the sitemap entry for an individual user.
- [`wp_sitemaps_users_pre_max_num_pages`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_users_pre_max_num_pages/) - Filters the max number of pages for a user sitemap before it is generated.
- [`wp_sitemaps_users_pre_url_list`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_users_pre_url_list/) - Filters the users URL list before it is generated.
- [`wp_sitemaps_users_query_args`](https://developer.wordpress.org/reference/hooks/wp_sitemaps_users_query_args/) - Filters the query arguments for authors with public posts.
- [`wp_update_comment_type_batch_size`](https://developer.wordpress.org/reference/hooks/wp_update_comment_type_batch_size/) - Filters the comment batch size for updating the comment type.

### Changes

- [`after_delete_post`](https://developer.wordpress.org/reference/hooks/after_delete_post/) - Added the <code>$post</code> parameter.
- [`after_plugin_row_{$plugin_file}`](https://developer.wordpress.org/reference/hooks/after_plugin_row_plugin_file/) - Added 'auto-update-enabled' and 'auto-update-disabled' to possible values for <code>$status</code>.
- [`after_plugin_row`](https://developer.wordpress.org/reference/hooks/after_plugin_row/) - Added 'auto-update-enabled' and 'auto-update-disabled' to possible values for <code>$status</code>.
- [`auto_plugin_update_send_email`](https://developer.wordpress.org/reference/hooks/auto_plugin_update_send_email/) (5.5.1) - Added the <code>$update_results</code> parameter.
- [`auto_theme_update_send_email`](https://developer.wordpress.org/reference/hooks/auto_theme_update_send_email/) (5.5.1) - Added the <code>$update_results</code> parameter.
- [`auto_update_{$type}`](https://developer.wordpress.org/reference/hooks/auto_update_type/) - The <code>$update</code> parameter accepts the value of null.
- [`before_delete_post`](https://developer.wordpress.org/reference/hooks/before_delete_post/) - Added the <code>$post</code> parameter.
- [`check_comment_flood`](https://developer.wordpress.org/reference/hooks/check_comment_flood/) - The <code>$avoid_die</code> parameter was renamed to <code>$wp_error</code>.
- [`delete_attachment`](https://developer.wordpress.org/reference/hooks/delete_attachment/) - Added the <code>$post</code> parameter.
- [`delete_post`](https://developer.wordpress.org/reference/hooks/delete_post/) - Added the <code>$post</code> parameter.
- [`delete_user`](https://developer.wordpress.org/reference/hooks/delete_user/) - Added the <code>$user</code> parameter.
- [`deleted_post`](https://developer.wordpress.org/reference/hooks/deleted_post/) - Added the <code>$post</code> parameter.
- [`deleted_user`](https://developer.wordpress.org/reference/hooks/deleted_user/) - Added the <code>$user</code> parameter.
- [`disable_formats_dropdown`](https://developer.wordpress.org/reference/hooks/disable_formats_dropdown/) - The <code>$post_type</code> parameter was added.
- [`display_post_states`](https://developer.wordpress.org/reference/hooks/display_post_states/) - Also applied in the Customizer context. If any admin functions are used within the filter, their existence should be checked with <code>function_exists()</code> before being used.
- [`get_{$meta_type}_metadata`](https://developer.wordpress.org/reference/hooks/get_meta_type_metadata/) - Added the <code>$meta_type</code> parameter.
- [`get_footer`](https://developer.wordpress.org/reference/hooks/get_footer/) - The <code>$args</code> parameter was added.
- [`get_header`](https://developer.wordpress.org/reference/hooks/get_header/) - The <code>$args</code> parameter was added.
- [`get_lastpostdate`](https://developer.wordpress.org/reference/hooks/get_lastpostdate/) - Added the <code>$post_type</code> parameter.
- [`get_lastpostmodified`](https://developer.wordpress.org/reference/hooks/get_lastpostmodified/) - Added the <code>$post_type</code> parameter.
- [`get_search_form`](https://developer.wordpress.org/reference/hooks/get_search_form/) - The <code>$args</code> parameter was added.
- [`get_sidebar`](https://developer.wordpress.org/reference/hooks/get_sidebar/) - The <code>$args</code> parameter was added.
- [`get_template_part_{$slug}`](https://developer.wordpress.org/reference/hooks/get_template_part_slug/) - The <code>$args</code> parameter was added.
- [`get_template_part`](https://developer.wordpress.org/reference/hooks/get_template_part/) - The <code>$args</code> parameter was added.
- [`get_the_archive_title`](https://developer.wordpress.org/reference/hooks/get_the_archive_title/) - Added the <code>$prefix</code> and <code>$original_title</code> parameters.
- [`post_date_column_time`](https://developer.wordpress.org/reference/hooks/post_date_column_time/) - Removed the difference between 'excerpt' and 'list' modes. The published time and date are both displayed now, which is equivalent to the previous 'excerpt' mode.
- [`pre_get_search_form`](https://developer.wordpress.org/reference/hooks/pre_get_search_form/) - The <code>$args</code> parameter was added.
- [`search_form_format`](https://developer.wordpress.org/reference/hooks/search_form_format/) - The <code>$args</code> parameter was added.
- [`upgrader_pre_download`](https://developer.wordpress.org/reference/hooks/upgrader_pre_download/) - Added the <code>$hook_extra</code> parameter.
- [`wp_is_comment_flood`](https://developer.wordpress.org/reference/hooks/wp_is_comment_flood/) - The <code>$avoid_die</code> parameter was renamed to <code>$wp_error</code>.
- [`wp_logout`](https://developer.wordpress.org/reference/hooks/wp_logout/) - Added the <code>$user_id</code> parameter.
- [`wp_privacy_exports_dir`](https://developer.wordpress.org/reference/hooks/wp_privacy_exports_dir/) - Exports now use relative paths, so changes to the directory via this filter should be reflected on the server.
- [`wp_privacy_exports_url`](https://developer.wordpress.org/reference/hooks/wp_privacy_exports_url/) - Exports now use relative paths, so changes to the directory URL via this filter should be reflected on the server.
- [`wp_update_comment_data`](https://developer.wordpress.org/reference/hooks/wp_update_comment_data/) - Returning a WP_Error value from the filter will short-circuit comment update and allow skipping further processing.
- [`wpmu_delete_user`](https://developer.wordpress.org/reference/hooks/wpmu_delete_user/) - Added the <code>$user</code> parameter.

## WordPress 5.4

### New Actions

- [`do_favicon`](https://developer.wordpress.org/reference/hooks/do_favicon/) - Fired when the template loader determines a favicon.ico request.
- [`do_faviconico`](https://developer.wordpress.org/reference/hooks/do_faviconico/) - Fires when serving the favicon.ico file.
- [`wp_nav_menu_item_custom_fields`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_item_custom_fields/) - Fires just before the move buttons of a nav menu item in the menu editor.
- [`wp_nav_menu_item_custom_fields_customize_template`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_item_custom_fields_customize_template/) - Fires at the end of the form field template for nav menu items in the customizer.

### New Filters

- [`add_trashed_suffix_to_trashed_posts`](https://developer.wordpress.org/reference/hooks/add_trashed_suffix_to_trashed_posts/) - Filters whether or not to add a `__trashed` suffix to the name of trashed posts that match the name of the updated post.
- [`rest_{$this->post_type}_item_schema`](https://developer.wordpress.org/reference/hooks/rest_this-post_type_item_schema/) - Filters the post's schema.
- [`set_screen_option_{$option}`](https://developer.wordpress.org/reference/hooks/set_screen_option_option/) (5.4.2) - Filters a screen option value before it is set.
- [`user_request_action_email_headers`](https://developer.wordpress.org/reference/hooks/user_request_action_email_headers/) - Filters the headers of the email sent when an account action is attempted.
- [`user_request_confirmed_email_headers`](https://developer.wordpress.org/reference/hooks/user_request_confirmed_email_headers/) - Filters the headers of the user request confirmation email.
- [`wp_privacy_additional_user_profile_data`](https://developer.wordpress.org/reference/hooks/wp_privacy_additional_user_profile_data/) - Filters the user's profile data for the privacy exporter.
- [`wp_privacy_personal_data_email_headers`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_email_headers/) - Filters the headers of the email sent with a personal data export file.

### Changes

- [`category_link`](https://developer.wordpress.org/reference/hooks/category_link/) (5.4.1) - Restored (un-deprecated).
- [`lostpassword_post`](https://developer.wordpress.org/reference/hooks/lostpassword_post/) - Added the <code>$user_data</code> parameter.
- [`newblog_notify_siteadmin`](https://developer.wordpress.org/reference/hooks/newblog_notify_siteadmin/) - The <code>$blog_id</code> parameter was added.
- [`post_locked_dialog`](https://developer.wordpress.org/reference/hooks/post_locked_dialog/) - The <code>$user</code> parameter was added.
- [`remove_user_from_blog`](https://developer.wordpress.org/reference/hooks/remove_user_from_blog/) - Added the <code>$reassign</code> parameter.
- [`set-screen-option`](https://developer.wordpress.org/reference/hooks/set-screen-option/) (5.4.2) - Only applied to options ending with '_page', or the 'layout_columns' option.
- [`switch_blog`](https://developer.wordpress.org/reference/hooks/switch_blog/) - The <code>$context</code> parameter was added.
- [`tag_link`](https://developer.wordpress.org/reference/hooks/tag_link/) (5.4.1) - Restored (un-deprecated).
- [`tag_row_actions`](https://developer.wordpress.org/reference/hooks/tag_row_actions/) (5.4.2) - Restored (un-deprecated).
- [`wp_insert_attachment_data`](https://developer.wordpress.org/reference/hooks/wp_insert_attachment_data/) (5.4.1) - The <code>$unsanitized_postarr</code> parameter was added.
- [`wp_insert_post_data`](https://developer.wordpress.org/reference/hooks/wp_insert_post_data/) (5.4.1) - The <code>$unsanitized_postarr</code> parameter was added.
- [`wp_login_failed`](https://developer.wordpress.org/reference/hooks/wp_login_failed/) - The <code>$error</code> parameter was added.
- [`wp_privacy_personal_data_export_file_created`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_export_file_created/) - Added the <code>$json_report_pathname</code> parameter.

## WordPress 5.3

### New Actions

- [`admin_email_confirm`](https://developer.wordpress.org/reference/hooks/admin_email_confirm/) - Fires before the admin email confirm form.
- [`admin_email_confirm_form`](https://developer.wordpress.org/reference/hooks/admin_email_confirm_form/) - Fires inside the admin-email-confirm-form form tags, before the hidden fields.
- [`manage_sites_extra_tablenav`](https://developer.wordpress.org/reference/hooks/manage_sites_extra_tablenav/) - Fires immediately following the closing "actions" div in the tablenav for the MS sites list table.
- [`restrict_manage_sites`](https://developer.wordpress.org/reference/hooks/restrict_manage_sites/) - Fires before the Filter button on the MS sites list table.

### New Filters

- [`admin_email_check_interval`](https://developer.wordpress.org/reference/hooks/admin_email_check_interval/) - Filters the interval for redirecting the user to the admin email confirmation screen.
- [`admin_email_remind_interval`](https://developer.wordpress.org/reference/hooks/admin_email_remind_interval/) (5.3.1) - Filters the interval for dismissing the admin email confirmation screen.
- [`big_image_size_threshold`](https://developer.wordpress.org/reference/hooks/big_image_size_threshold/) - Filters the "BIG image" threshold value.
- [`comments_pre_query`](https://developer.wordpress.org/reference/hooks/comments_pre_query/) - Filters the comments data before the query takes place.
- [`display_site_states`](https://developer.wordpress.org/reference/hooks/display_site_states/) - Filters the default site display states for items in the Sites list table.
- [`insert_with_markers_inline_instructions`](https://developer.wordpress.org/reference/hooks/insert_with_markers_inline_instructions/) - Filters the inline instructions inserted before the dynamically generated content.
- [`is_sticky`](https://developer.wordpress.org/reference/hooks/is_sticky/) - Filters whether a post is sticky.
- [`log_query_custom_data`](https://developer.wordpress.org/reference/hooks/log_query_custom_data/) - Filters the custom data to log alongside a query.
- [`make_clickable_rel`](https://developer.wordpress.org/reference/hooks/make_clickable_rel/) - Filters the rel value that is added to URL matches converted to links.
- [`recovery_email_debug_info`](https://developer.wordpress.org/reference/hooks/recovery_email_debug_info/) - Filters the debug information included in the fatal error protection email.
- [`register_sidebar_defaults`](https://developer.wordpress.org/reference/hooks/register_sidebar_defaults/) - Filters the sidebar default arguments.
- [`site_status_test_result`](https://developer.wordpress.org/reference/hooks/site_status_test_result/) - Filters the output of a finished Site Health test.
- [`terms_pre_query`](https://developer.wordpress.org/reference/hooks/terms_pre_query/) - Filters the terms array before the query takes place.
- [`wp_date`](https://developer.wordpress.org/reference/hooks/wp_date/) - Filters the date formatted based on the locale.
- [`wp_get_missing_image_subsizes`](https://developer.wordpress.org/reference/hooks/wp_get_missing_image_subsizes/) - Filters the array of missing image sub-sizes for an uploaded image.
- [`wp_get_original_image_path`](https://developer.wordpress.org/reference/hooks/wp_get_original_image_path/) - Filters the path to the original image.
- [`wp_get_original_image_url`](https://developer.wordpress.org/reference/hooks/wp_get_original_image_url/) - Filters the URL to the original attachment image.
- [`wp_image_maybe_exif_rotate`](https://developer.wordpress.org/reference/hooks/wp_image_maybe_exif_rotate/) - Filters the `$orientation` value to correct it before rotating or to prevent rotating the image.
- [`wp_image_resize_identical_dimensions`](https://developer.wordpress.org/reference/hooks/wp_image_resize_identical_dimensions/) - Filters whether to proceed with making an image sub-size with identical dimensions with the original/source image. Differences of 1px may be due to rounding and are ignored.
- [`wp_privacy_personal_data_email_subject`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_email_subject/) - Filters the subject of the email sent when an export request is completed.
- [`wp_privacy_personal_data_email_to`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_email_to/) - Filters the recipient of the personal data export email notification.

### Changes

- [`gallery_style`](https://developer.wordpress.org/reference/hooks/gallery_style/) - Removed the <code>type</code> attribute for <code>style</code> tags when the theme supports HTML5 style, and changed the quotes from single to double for other themes.
- [`intermediate_image_sizes_advanced`](https://developer.wordpress.org/reference/hooks/intermediate_image_sizes_advanced/) - Added the <code>$attachment_id</code> argument.
- [`mce_external_languages`](https://developer.wordpress.org/reference/hooks/mce_external_languages/) - The <code>$editor_id</code> parameter was added.
- [`mce_external_plugins`](https://developer.wordpress.org/reference/hooks/mce_external_plugins/) - The <code>$editor_id</code> parameter was added.
- [`random_password`](https://developer.wordpress.org/reference/hooks/random_password/) - Added the <code>$length</code>, <code>$special_chars</code>, and <code>$extra_special_chars</code> parameters.
- [`site_status_test_php_modules`](https://developer.wordpress.org/reference/hooks/site_status_test_php_modules/) - The <code>$constant</code> and <code>$class</code> parameters were added.
- [`tiny_mce_plugins`](https://developer.wordpress.org/reference/hooks/tiny_mce_plugins/) - The <code>$editor_id</code> parameter was added.
- [`wp_generate_attachment_metadata`](https://developer.wordpress.org/reference/hooks/wp_generate_attachment_metadata/) - The <code>$context</code> parameter was added.
- [`wp_privacy_personal_data_email_content`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_email_content/) - Introduced the <code>$email_data</code> array.

## WordPress 5.2

### New Actions

- [`generate_recovery_mode_key`](https://developer.wordpress.org/reference/hooks/generate_recovery_mode_key/) - Fires when a recovery mode key is generated.
- [`get_template_part`](https://developer.wordpress.org/reference/hooks/get_template_part/) - Fires before an attempt is made to locate and load a template part.
- [`wp_body_open`](https://developer.wordpress.org/reference/hooks/wp_body_open/) - Triggered after the opening body tag.

### New Filters

- [`category_list_link_attributes`](https://developer.wordpress.org/reference/hooks/category_list_link_attributes/) - Filters the HTML attributes applied to a category list item's anchor element.
- [`comment_duplicate_message`](https://developer.wordpress.org/reference/hooks/comment_duplicate_message/) - Filters duplicate comment error message.
- [`comment_flood_message`](https://developer.wordpress.org/reference/hooks/comment_flood_message/) - Filters the comment flood error message.
- [`debug_information`](https://developer.wordpress.org/reference/hooks/debug_information/) - Filters the debug information shown on the Tools -> Site Health -> Info screen.
- [`disable_formats_dropdown`](https://developer.wordpress.org/reference/hooks/disable_formats_dropdown/) - Filters whether to remove the 'Formats' drop-down from the post list table.
- [`get_feed_build_date`](https://developer.wordpress.org/reference/hooks/get_feed_build_date/) - Filters the date the last post or comment in the query was modified.
- [`is_protected_endpoint`](https://developer.wordpress.org/reference/hooks/is_protected_endpoint/) - Filters whether the current request is against a protected endpoint.
- [`login_headertext`](https://developer.wordpress.org/reference/hooks/login_headertext/) - Filters the link text of the header logo above the login form.
- [`ms_user_list_site_class`](https://developer.wordpress.org/reference/hooks/ms_user_list_site_class/) - Filters the span class for a site listing on the multisite user list table.
- [`networks_pre_query`](https://developer.wordpress.org/reference/hooks/networks_pre_query/) - Filters the network data before the query takes place.
- [`oembed_iframe_title_attribute`](https://developer.wordpress.org/reference/hooks/oembed_iframe_title_attribute/) - Filters the title attribute of the given oEmbed HTML iframe.
- [`populate_site_meta`](https://developer.wordpress.org/reference/hooks/populate_site_meta/) - Filters meta for a site on creation.
- [`post_column_taxonomy_links`](https://developer.wordpress.org/reference/hooks/post_column_taxonomy_links/) - Filters the links in `$taxonomy` column of edit.php.
- [`recovery_email_support_info`](https://developer.wordpress.org/reference/hooks/recovery_email_support_info/) - Filters the support message sent with the fatal error protection email.
- [`recovery_mode_begin_url`](https://developer.wordpress.org/reference/hooks/recovery_mode_begin_url/) - Filters the URL to begin recovery mode.
- [`recovery_mode_cookie_length`](https://developer.wordpress.org/reference/hooks/recovery_mode_cookie_length/) - Filters the length of time a Recovery Mode cookie is valid for.
- [`recovery_mode_email`](https://developer.wordpress.org/reference/hooks/recovery_mode_email/) - Filters the contents of the Recovery Mode email.
- [`recovery_mode_email_link_ttl`](https://developer.wordpress.org/reference/hooks/recovery_mode_email_link_ttl/) - Filters the amount of time the recovery mode email link is valid for.
- [`recovery_mode_email_rate_limit`](https://developer.wordpress.org/reference/hooks/recovery_mode_email_rate_limit/) - Filters the rate limit between sending new recovery mode email links.
- [`search_form_args`](https://developer.wordpress.org/reference/hooks/search_form_args/) - Filters the array of arguments used when generating the search form.
- [`site_status_test_php_modules`](https://developer.wordpress.org/reference/hooks/site_status_test_php_modules/) - Filters the array representing all the modules we wish to test for.
- [`site_status_tests`](https://developer.wordpress.org/reference/hooks/site_status_tests/) - Filters which site status tests are run on a site.
- [`sites_pre_query`](https://developer.wordpress.org/reference/hooks/sites_pre_query/) - Filters the site data before the get_sites query takes place.
- [`users_have_additional_content`](https://developer.wordpress.org/reference/hooks/users_have_additional_content/) - Filters whether the users being deleted have additional content associated with them outside of the `post_author` and `link_owner` relationships.
- [`wp_die_jsonp_handler`](https://developer.wordpress.org/reference/hooks/wp_die_jsonp_handler/) - Filters the callback for killing WordPress execution for JSONP REST requests.
- [`wp_die_xml_handler`](https://developer.wordpress.org/reference/hooks/wp_die_xml_handler/) - Filters the callback for killing WordPress execution for XML requests.
- [`wp_fatal_error_handler_enabled`](https://developer.wordpress.org/reference/hooks/wp_fatal_error_handler_enabled/) - Filters whether the fatal error handler is enabled.
- [`wp_php_error_args`](https://developer.wordpress.org/reference/hooks/wp_php_error_args/) - Filters the arguments passed to {@see wp_die()} for the default PHP error template.
- [`wp_php_error_message`](https://developer.wordpress.org/reference/hooks/wp_php_error_message/) - Filters the message that the default PHP error template displays.
- [`wp_protected_ajax_actions`](https://developer.wordpress.org/reference/hooks/wp_protected_ajax_actions/) - Filters the array of protected Ajax actions.
- [`wp_should_handle_php_error`](https://developer.wordpress.org/reference/hooks/wp_should_handle_php_error/) - Filters whether a given thrown error should be handled by the fatal error handler.
- [`wp_signature_hosts`](https://developer.wordpress.org/reference/hooks/wp_signature_hosts/) - Filters the list of hosts which should have Signature Verification attempted on.
- [`wp_signature_softfail`](https://developer.wordpress.org/reference/hooks/wp_signature_softfail/) - Filters whether Signature Verification failures should be allowed to soft fail.
- [`wp_signature_url`](https://developer.wordpress.org/reference/hooks/wp_signature_url/) - Filters the URL where the signature for a file is located.
- [`wp_trusted_keys`](https://developer.wordpress.org/reference/hooks/wp_trusted_keys/) - Filters the valid signing keys used to verify the contents of files.

### Changes

- [`get_archives_link`](https://developer.wordpress.org/reference/hooks/get_archives_link/) - Added the <code>$selected</code> parameter.
- [`get_pagenum_link`](https://developer.wordpress.org/reference/hooks/get_pagenum_link/) - Added the <code>$pagenum</code> argument.

## WordPress 5.1

### New Actions

- [`edit_post_{$post->post_type}`](https://developer.wordpress.org/reference/hooks/edit_post_post-post_type/) - Fires once an existing post has been updated.
- [`mu_plugin_loaded`](https://developer.wordpress.org/reference/hooks/mu_plugin_loaded/) - Fires once a single must-use plugin has loaded.
- [`network_plugin_loaded`](https://developer.wordpress.org/reference/hooks/network_plugin_loaded/) - Fires once a single network-activated plugin has loaded.
- [`plugin_loaded`](https://developer.wordpress.org/reference/hooks/plugin_loaded/) - Fires once a single activated plugin has loaded.
- [`registered_taxonomy_for_object_type`](https://developer.wordpress.org/reference/hooks/registered_taxonomy_for_object_type/) - Fires after a taxonomy is registered for an object type.
- [`unregistered_taxonomy_for_object_type`](https://developer.wordpress.org/reference/hooks/unregistered_taxonomy_for_object_type/) - Fires after a taxonomy is unregistered for an object type.
- [`wp_delete_site`](https://developer.wordpress.org/reference/hooks/wp_delete_site/) - Fires once a site has been deleted from the database.
- [`wp_initialize_site`](https://developer.wordpress.org/reference/hooks/wp_initialize_site/) - Fires when a site's initialization routine should be executed.
- [`wp_insert_site`](https://developer.wordpress.org/reference/hooks/wp_insert_site/) - Fires once a site has been inserted into the database.
- [`wp_uninitialize_site`](https://developer.wordpress.org/reference/hooks/wp_uninitialize_site/) - Fires when a site's uninitialization routine should be executed.
- [`wp_update_site`](https://developer.wordpress.org/reference/hooks/wp_update_site/) - Fires once a site has been updated in the database.
- [`wp_validate_site_data`](https://developer.wordpress.org/reference/hooks/wp_validate_site_data/) - Fires when data should be validated for a site prior to inserting or updating in the database.
- [`wp_validate_site_deletion`](https://developer.wordpress.org/reference/hooks/wp_validate_site_deletion/) - Fires before a site should be deleted from the database.

### New Filters

- [`allow_empty_comment`](https://developer.wordpress.org/reference/hooks/allow_empty_comment/) - Filters whether an empty comment should be allowed.
- [`comments_list_table_query_args`](https://developer.wordpress.org/reference/hooks/comments_list_table_query_args/) - Filters the arguments for the comment query in the comments list table.
- [`download_url_error_max_body_size`](https://developer.wordpress.org/reference/hooks/download_url_error_max_body_size/) - Filters the maximum error response body size in `download_url()`.
- [`get_schedule`](https://developer.wordpress.org/reference/hooks/get_schedule/) - Filters the schedule name for a hook.
- [`has_post_thumbnail`](https://developer.wordpress.org/reference/hooks/has_post_thumbnail/) - Filters whether a post has a post thumbnail.
- [`pre_clear_scheduled_hook`](https://developer.wordpress.org/reference/hooks/pre_clear_scheduled_hook/) - Filter to override clearing a scheduled hook.
- [`pre_count_users`](https://developer.wordpress.org/reference/hooks/pre_count_users/) - Filters the user count before queries are run.
- [`pre_get_ready_cron_jobs`](https://developer.wordpress.org/reference/hooks/pre_get_ready_cron_jobs/) - Filter to override retrieving ready cron jobs.
- [`pre_get_scheduled_event`](https://developer.wordpress.org/reference/hooks/pre_get_scheduled_event/) - Filter to override retrieving a scheduled event.
- [`pre_render_block`](https://developer.wordpress.org/reference/hooks/pre_render_block/) - Allows render_block() to be short-circuited, by returning a non-null value.
- [`pre_reschedule_event`](https://developer.wordpress.org/reference/hooks/pre_reschedule_event/) - Filter to override rescheduling of a recurring event.
- [`pre_schedule_event`](https://developer.wordpress.org/reference/hooks/pre_schedule_event/) - Filter to override scheduling an event.
- [`pre_unschedule_event`](https://developer.wordpress.org/reference/hooks/pre_unschedule_event/) - Filter to override unscheduling of events.
- [`pre_unschedule_hook`](https://developer.wordpress.org/reference/hooks/pre_unschedule_hook/) - Filter to override clearing all events attached to the hook.
- [`pre_wp_is_site_initialized`](https://developer.wordpress.org/reference/hooks/pre_wp_is_site_initialized/) - Filters the check for whether a site is initialized before the database is accessed.
- [`pre_wp_unique_post_slug`](https://developer.wordpress.org/reference/hooks/pre_wp_unique_post_slug/) - Filters the post slug before it is generated to be unique.
- [`render_block_data`](https://developer.wordpress.org/reference/hooks/render_block_data/) - Filters the block being rendered in render_block(), before it's processed.
- [`rest_post_search_query`](https://developer.wordpress.org/reference/hooks/rest_post_search_query/) - Filters the query arguments for a REST API post search request.
- [`users_pre_query`](https://developer.wordpress.org/reference/hooks/users_pre_query/) - Filters the users array before the query takes place.
- [`wp_die_json_handler`](https://developer.wordpress.org/reference/hooks/wp_die_json_handler/) - Filters the callback for killing WordPress execution for JSON requests.
- [`wp_direct_php_update_url`](https://developer.wordpress.org/reference/hooks/wp_direct_php_update_url/) (5.1.1) - Filters the URL for directly updating the PHP version the site is running on from the host.
- [`wp_initialize_site_args`](https://developer.wordpress.org/reference/hooks/wp_initialize_site_args/) - Filters the arguments for initializing a site.
- [`wp_insert_term_duplicate_term_check`](https://developer.wordpress.org/reference/hooks/wp_insert_term_duplicate_term_check/) - Filters the duplicate term check that takes place during term creation.
- [`wp_is_php_version_acceptable`](https://developer.wordpress.org/reference/hooks/wp_is_php_version_acceptable/) (5.1.1) - Filters whether the active PHP version is considered acceptable by WordPress.
- [`wp_normalize_site_data`](https://developer.wordpress.org/reference/hooks/wp_normalize_site_data/) - Filters passed site data in order to normalize it.
- [`wp_targeted_link_rel`](https://developer.wordpress.org/reference/hooks/wp_targeted_link_rel/) - Filters the rel values that are added to links with `target` attribute.
- [`wp_update_php_url`](https://developer.wordpress.org/reference/hooks/wp_update_php_url/) - Filters the URL to learn more about updating the PHP version the site is running on.
- [`wp_using_themes`](https://developer.wordpress.org/reference/hooks/wp_using_themes/) - Filters whether the current request should use themes.
- [`x_redirect_by`](https://developer.wordpress.org/reference/hooks/x_redirect_by/) - Filters the value of the `X-Redirect-By` HTTP header.

### Changes

- [`comment_status_links`](https://developer.wordpress.org/reference/hooks/comment_status_links/) - The 'Mine' link was added.
- [`doing_it_wrong_trigger_error`](https://developer.wordpress.org/reference/hooks/doing_it_wrong_trigger_error/) - Added the <code>$function_name</code>, <code>$message</code>, and <code>$version</code> parameters.
- [`found_users_query`](https://developer.wordpress.org/reference/hooks/found_users_query/) - Added the <code>$query</code> parameter.
- [`http_headers_useragent`](https://developer.wordpress.org/reference/hooks/http_headers_useragent/) - The <code>$url</code> parameter was added.
- [`http_request_redirection_count`](https://developer.wordpress.org/reference/hooks/http_request_redirection_count/) - The <code>$url</code> parameter was added.
- [`http_request_reject_unsafe_urls`](https://developer.wordpress.org/reference/hooks/http_request_reject_unsafe_urls/) - The <code>$url</code> parameter was added.
- [`http_request_timeout`](https://developer.wordpress.org/reference/hooks/http_request_timeout/) - The <code>$url</code> parameter was added.
- [`http_request_version`](https://developer.wordpress.org/reference/hooks/http_request_version/) - The <code>$url</code> parameter was added.
- [`https_local_ssl_verify`](https://developer.wordpress.org/reference/hooks/https_local_ssl_verify/) - The <code>$url</code> parameter was added.
- [`https_ssl_verify`](https://developer.wordpress.org/reference/hooks/https_ssl_verify/) - The <code>$url</code> parameter was added.
- [`lost_password`](https://developer.wordpress.org/reference/hooks/lost_password/) - Added the <code>$errors</code> parameter.
- [`wp_check_filetype_and_ext`](https://developer.wordpress.org/reference/hooks/wp_check_filetype_and_ext/) - The <code>$real_mime</code> parameter was added.
- [`wp_get_attachment_link`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_link/) - Added the <code>$attr</code> parameter.

## WordPress 5.0

### New Actions

- [`block_editor_meta_box_hidden_fields`](https://developer.wordpress.org/reference/hooks/block_editor_meta_box_hidden_fields/) - Adds hidden input fields to the meta box save form.
- [`enqueue_block_assets`](https://developer.wordpress.org/reference/hooks/enqueue_block_assets/) - Fires after enqueuing block assets for both editor and front-end.
- [`enqueue_block_editor_assets`](https://developer.wordpress.org/reference/hooks/enqueue_block_editor_assets/) - Fires after block assets have been enqueued for the editing interface.
- [`rest_after_insert_attachment`](https://developer.wordpress.org/reference/hooks/rest_after_insert_attachment/) - Fires after a single attachment is completely created or updated via the REST API.
- [`rest_after_insert_comment`](https://developer.wordpress.org/reference/hooks/rest_after_insert_comment/) - Fires completely after a comment is created or updated via the REST API.
- [`rest_after_insert_user`](https://developer.wordpress.org/reference/hooks/rest_after_insert_user/) - Fires after a user is completely created or updated via the REST API.
- [`rest_after_insert_{$this->post_type}`](https://developer.wordpress.org/reference/hooks/rest_after_insert_this-post_type/) - Fires after a single post is completely created or updated via the REST API.
- [`rest_after_insert_{$this->taxonomy}`](https://developer.wordpress.org/reference/hooks/rest_after_insert_this-taxonomy/) - Fires after a single term is completely created or updated via the REST API.

### New Filters

- [`block_editor_no_javascript_message`](https://developer.wordpress.org/reference/hooks/block_editor_no_javascript_message/) (5.0.3) - Filters the message displayed in the block editor interface when JavaScript is not enabled in the browser.
- [`block_parser_class`](https://developer.wordpress.org/reference/hooks/block_parser_class/) - Filter to allow plugins to replace the server-side block parser.
- [`delete_{$meta_type}_metadata_by_mid`](https://developer.wordpress.org/reference/hooks/delete_meta_type_metadata_by_mid/) - Short-circuits deleting metadata of a specific type by meta ID.
- [`determine_locale`](https://developer.wordpress.org/reference/hooks/determine_locale/) - Filters the locale for the current request.
- [`excerpt_allowed_blocks`](https://developer.wordpress.org/reference/hooks/excerpt_allowed_blocks/) - Filters the list of blocks that can contribute to the excerpt.
- [`filter_block_editor_meta_boxes`](https://developer.wordpress.org/reference/hooks/filter_block_editor_meta_boxes/) - Fires right before the meta boxes are rendered.
- [`get_{$meta_type}_metadata_by_mid`](https://developer.wordpress.org/reference/hooks/get_meta_type_metadata_by_mid/) - Short-circuits the return value when fetching a meta field by meta ID.
- [`load_script_textdomain_relative_path`](https://developer.wordpress.org/reference/hooks/load_script_textdomain_relative_path/) (5.0.2) - Filters the relative path of scripts used for finding translation files.
- [`load_script_translation_file`](https://developer.wordpress.org/reference/hooks/load_script_translation_file/) (5.0.2) - Filters the file path for loading script translations for the given script handle and text domain.
- [`load_script_translations`](https://developer.wordpress.org/reference/hooks/load_script_translations/) (5.0.2) - Filters script translations for the given file, script handle and text domain.
- [`pre_determine_locale`](https://developer.wordpress.org/reference/hooks/pre_determine_locale/) - Filters the locale for the current request prior to the default determination process.
- [`pre_load_script_translations`](https://developer.wordpress.org/reference/hooks/pre_load_script_translations/) (5.0.2) - Pre-filters script translations for the given file, script handle and text domain.
- [`render_block`](https://developer.wordpress.org/reference/hooks/render_block/) - Filters the content of a single block.
- [`rest_prepare_autosave`](https://developer.wordpress.org/reference/hooks/rest_prepare_autosave/) - Filters a revision returned from the REST API.
- [`rest_prepare_theme`](https://developer.wordpress.org/reference/hooks/rest_prepare_theme/) - Filters theme data returned from the REST API.
- [`rest_revision_query`](https://developer.wordpress.org/reference/hooks/rest_revision_query/) - Filters WP_Query arguments when querying revisions via the REST API.
- [`rest_themes_collection_params`](https://developer.wordpress.org/reference/hooks/rest_themes_collection_params/) - Filters REST API collection parameters for the themes controller.
- [`update_{$meta_type}_metadata_by_mid`](https://developer.wordpress.org/reference/hooks/update_meta_type_metadata_by_mid/) - Short-circuits updating metadata of a specific type by meta ID.
- [`update_{$meta_type}_metadata_cache`](https://developer.wordpress.org/reference/hooks/update_meta_type_metadata_cache/) - Short-circuits updating the metadata cache of a specific type.
- [`use_block_editor_for_post`](https://developer.wordpress.org/reference/hooks/use_block_editor_for_post/) - Filters whether a post is able to be edited in the block editor.
- [`use_block_editor_for_post_type`](https://developer.wordpress.org/reference/hooks/use_block_editor_for_post_type/) - Filters whether a post is able to be edited in the block editor.
- [`wp_kses_uri_attributes`](https://developer.wordpress.org/reference/hooks/wp_kses_uri_attributes/) (5.0.1) - Filters the list of attributes that are required to contain a URL.
- [`wp_rest_search_handlers`](https://developer.wordpress.org/reference/hooks/wp_rest_search_handlers/) - Filters the search handlers to use in the REST search controller.
- [`write_your_story`](https://developer.wordpress.org/reference/hooks/write_your_story/) - Filters the body placeholder text.

### Changes

- [`wp_read_image_metadata`](https://developer.wordpress.org/reference/hooks/wp_read_image_metadata/) - The <code>$exif</code> parameter was added.

## WordPress 4.9

### New Actions

- [`add_inline_data`](https://developer.wordpress.org/reference/hooks/add_inline_data/) (4.9.8) - Fires after outputting the fields for the inline editor for posts and pages.
- [`clean_taxonomy_cache`](https://developer.wordpress.org/reference/hooks/clean_taxonomy_cache/) - Fires after a taxonomy's caches have been cleaned.
- [`loop_no_results`](https://developer.wordpress.org/reference/hooks/loop_no_results/) - Fires if no results are found in a post query.
- [`manage_users_extra_tablenav`](https://developer.wordpress.org/reference/hooks/manage_users_extra_tablenav/) - Fires immediately following the closing "actions" div in the tablenav for the users list table.
- [`page_attributes_misc_attributes`](https://developer.wordpress.org/reference/hooks/page_attributes_misc_attributes/) - Fires before the help hint text in the 'Page Attributes' meta box.
- [`user_request_action_confirmed`](https://developer.wordpress.org/reference/hooks/user_request_action_confirmed/) (4.9.6) - Fires an action hook when the account action has been confirmed by the user.
- [`wp_enqueue_code_editor`](https://developer.wordpress.org/reference/hooks/wp_enqueue_code_editor/) - Fires when scripts and styles are enqueued for the code editor.
- [`wp_privacy_personal_data_erased`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_erased/) (4.9.6) - Fires immediately after a personal data erasure request has been marked completed.
- [`wp_privacy_personal_data_export_file`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_export_file/) (4.9.6) - Generate the export file from the collected, grouped personal data.
- [`wp_privacy_personal_data_export_file_created`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_export_file_created/) (4.9.6) - Fires right after all personal data has been written to the export file.

### New Filters

- [`admin_referrer_policy`](https://developer.wordpress.org/reference/hooks/admin_referrer_policy/) - Filters the admin referrer policy header value.
- [`alloptions`](https://developer.wordpress.org/reference/hooks/alloptions/) - Filters all options after retrieving them.
- [`auth_{$object_type}_meta_{$meta_key}_for_{$object_subtype}`](https://developer.wordpress.org/reference/hooks/auth_object_type_meta_meta_key_for_object_subtype/) (4.9.8) - Filters whether the user is allowed to edit a specific meta key of a specific object type and subtype.
- [`available_permalink_structure_tags`](https://developer.wordpress.org/reference/hooks/available_permalink_structure_tags/) - Filters the list of available permalink structure tags on the Permalinks settings page.
- [`can_add_user_to_blog`](https://developer.wordpress.org/reference/hooks/can_add_user_to_blog/) - Filters whether a user should be added to a site.
- [`core_version_check_query_args`](https://developer.wordpress.org/reference/hooks/core_version_check_query_args/) - Filters the query arguments sent as part of the core version check.
- [`customize_changeset_branching`](https://developer.wordpress.org/reference/hooks/customize_changeset_branching/) - Filters whether or not changeset branching is allowed.
- [`customize_load_themes`](https://developer.wordpress.org/reference/hooks/customize_load_themes/) - Filters the theme data loaded in the customizer.
- [`embed_thumbnail_id`](https://developer.wordpress.org/reference/hooks/embed_thumbnail_id/) - Filters the thumbnail image ID for use in the embed template.
- [`get_object_subtype_{$object_type}`](https://developer.wordpress.org/reference/hooks/get_object_subtype_object_type/) (4.9.8) - Filters the object subtype identifier.
- [`get_the_post_type_description`](https://developer.wordpress.org/reference/hooks/get_the_post_type_description/) - Filters the description for a post type archive.
- [`login_link_separator`](https://developer.wordpress.org/reference/hooks/login_link_separator/) - Filters the separator used between login form navigation links.
- [`login_title`](https://developer.wordpress.org/reference/hooks/login_title/) - Filters the title tag content for login page.
- [`network_admin_email_change_email`](https://developer.wordpress.org/reference/hooks/network_admin_email_change_email/) - Filters the contents of the email notification sent when the network admin email address is changed.
- [`new_network_admin_email_content`](https://developer.wordpress.org/reference/hooks/new_network_admin_email_content/) - Filters the text of the email sent when a change of network admin email address is attempted.
- [`old_slug_redirect_post_id`](https://developer.wordpress.org/reference/hooks/old_slug_redirect_post_id/) (4.9.3) - Filters the old slug redirect post ID.
- [`plugin_files_exclusions`](https://developer.wordpress.org/reference/hooks/plugin_files_exclusions/) - Filters the array of excluded directories and files while scanning the folder.
- [`pre_cache_alloptions`](https://developer.wordpress.org/reference/hooks/pre_cache_alloptions/) - Filters all options before caching them.
- [`pre_get_main_site_id`](https://developer.wordpress.org/reference/hooks/pre_get_main_site_id/) - Filters the main site ID.
- [`pre_move_uploaded_file`](https://developer.wordpress.org/reference/hooks/pre_move_uploaded_file/) - Filters whether to short-circuit moving the uploaded file after passing all checks.
- [`pre_term_link`](https://developer.wordpress.org/reference/hooks/pre_term_link/) - Filters the permalink structure for a term before token replacement occurs.
- [`pre_trash_post`](https://developer.wordpress.org/reference/hooks/pre_trash_post/) - Filters whether a post trashing should take place.
- [`pre_untrash_post`](https://developer.wordpress.org/reference/hooks/pre_untrash_post/) - Filters whether a post untrashing should take place.
- [`privacy_policy_url`](https://developer.wordpress.org/reference/hooks/privacy_policy_url/) (4.9.6) - Filters the URL of the privacy policy page.
- [`replace_editor`](https://developer.wordpress.org/reference/hooks/replace_editor/) - Allows replacement of the editor.
- [`sanitize_{$object_type}_meta_{$meta_key}_for_{$object_subtype}`](https://developer.wordpress.org/reference/hooks/sanitize_object_type_meta_meta_key_for_object_subtype/) (4.9.8) - Filters the sanitization of a specific meta key of a specific meta type and subtype.
- [`self_admin_url`](https://developer.wordpress.org/reference/hooks/self_admin_url/) - Filters the admin URL for the current site or network depending on context.
- [`send_network_admin_email_change_email`](https://developer.wordpress.org/reference/hooks/send_network_admin_email_change_email/) - Filters whether to send the network admin email change notification email.
- [`send_site_admin_email_change_email`](https://developer.wordpress.org/reference/hooks/send_site_admin_email_change_email/) - Filters whether to send the site admin email change notification email.
- [`site_admin_email_change_email`](https://developer.wordpress.org/reference/hooks/site_admin_email_change_email/) - Filters the contents of the email notification sent when the site admin email address is changed.
- [`the_privacy_policy_link`](https://developer.wordpress.org/reference/hooks/the_privacy_policy_link/) (4.9.6) - Filters the privacy policy link.
- [`theme_templates`](https://developer.wordpress.org/reference/hooks/theme_templates/) (4.9.6) - Filters list of page templates for a theme.
- [`user_erasure_fulfillment_email_to`](https://developer.wordpress.org/reference/hooks/user_erasure_fulfillment_email_to/) (4.9.6) - Filters the recipient of the data erasure fulfillment notification.
- [`user_request_action_confirmed_message`](https://developer.wordpress.org/reference/hooks/user_request_action_confirmed_message/) (4.9.6) - Filters the message displayed to a user when they confirm a data request.
- [`user_request_action_description`](https://developer.wordpress.org/reference/hooks/user_request_action_description/) (4.9.6) - Filters the user action description.
- [`user_request_action_email_content`](https://developer.wordpress.org/reference/hooks/user_request_action_email_content/) (4.9.6) - Filters the text of the email sent when an account action is attempted.
- [`user_request_action_email_subject`](https://developer.wordpress.org/reference/hooks/user_request_action_email_subject/) (4.9.6) - Filters the subject of the email sent when an account action is attempted.
- [`user_request_confirmed_email_subject`](https://developer.wordpress.org/reference/hooks/user_request_confirmed_email_subject/) (4.9.8) - Filters the subject of the user request confirmation email.
- [`user_request_confirmed_email_to`](https://developer.wordpress.org/reference/hooks/user_request_confirmed_email_to/) (4.9.6) - Filters the recipient of the data request confirmation notification.
- [`user_request_key_expiration`](https://developer.wordpress.org/reference/hooks/user_request_key_expiration/) (4.9.6) - Filters the expiration time of confirm keys.
- [`username_exists`](https://developer.wordpress.org/reference/hooks/username_exists/) - Filters whether the given username exists.
- [`widget_{$this->id_base}_instance_schema`](https://developer.wordpress.org/reference/hooks/widget_this-id_base_instance_schema/) - Filters the media widget instance schema to add additional properties.
- [`wp_anonymize_comment`](https://developer.wordpress.org/reference/hooks/wp_anonymize_comment/) (4.9.6) - Filters whether to anonymize the comment.
- [`wp_code_editor_settings`](https://developer.wordpress.org/reference/hooks/wp_code_editor_settings/) - Filters settings that are passed into the code editor.
- [`wp_get_nav_menu_name`](https://developer.wordpress.org/reference/hooks/wp_get_nav_menu_name/) - Filters the navigation menu name being returned.
- [`wp_get_object_terms_args`](https://developer.wordpress.org/reference/hooks/wp_get_object_terms_args/) - Filters arguments for retrieving object terms.
- [`wp_is_mobile`](https://developer.wordpress.org/reference/hooks/wp_is_mobile/) - Filters whether the request should be treated as coming from a mobile device or not.
- [`wp_new_user_notification_email`](https://developer.wordpress.org/reference/hooks/wp_new_user_notification_email/) - Filters the contents of the new user notification email sent to the new user.
- [`wp_new_user_notification_email_admin`](https://developer.wordpress.org/reference/hooks/wp_new_user_notification_email_admin/) - Filters the contents of the new user notification email sent to the site admin.
- [`wp_password_change_notification_email`](https://developer.wordpress.org/reference/hooks/wp_password_change_notification_email/) - Filters the contents of the password change notification email sent to the site admin.
- [`wp_pre_insert_user_data`](https://developer.wordpress.org/reference/hooks/wp_pre_insert_user_data/) - Filters user data before the record is created or updated.
- [`wp_privacy_anonymize_data`](https://developer.wordpress.org/reference/hooks/wp_privacy_anonymize_data/) (4.9.6) - Filters the anonymous data for each type.
- [`wp_privacy_export_expiration`](https://developer.wordpress.org/reference/hooks/wp_privacy_export_expiration/) (4.9.6) - Filters the lifetime, in seconds, of a personal data export file.
- [`wp_privacy_exports_dir`](https://developer.wordpress.org/reference/hooks/wp_privacy_exports_dir/) (4.9.6) - Filters the directory used to store personal data export files.
- [`wp_privacy_exports_url`](https://developer.wordpress.org/reference/hooks/wp_privacy_exports_url/) (4.9.6) - Filters the URL of the directory used to store personal data export files.
- [`wp_privacy_personal_data_email_content`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_email_content/) (4.9.6) - Filters the text of the email sent with a personal data export file.
- [`wp_privacy_personal_data_erasers`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_erasers/) (4.9.6) - Filters the array of personal data eraser callbacks.
- [`wp_privacy_personal_data_erasure_page`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_erasure_page/) (4.9.6) - Filters a page of personal data eraser data.
- [`wp_privacy_personal_data_export_page`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_export_page/) (4.9.6) - Filters a page of personal data exporter data. Used to build the export report.
- [`wp_privacy_personal_data_exporters`](https://developer.wordpress.org/reference/hooks/wp_privacy_personal_data_exporters/) (4.9.6) - Filters the array of exporter callbacks.
- [`wp_read_video_metadata`](https://developer.wordpress.org/reference/hooks/wp_read_video_metadata/) - Filters the array of metadata retrieved from a video.

### Changes

- [`admin_referrer_policy`](https://developer.wordpress.org/reference/hooks/admin_referrer_policy/) (4.9.5) - The default value was changed to 'strict-origin-when-cross-origin'.
- [`attachment_submitbox_misc_actions`](https://developer.wordpress.org/reference/hooks/attachment_submitbox_misc_actions/) - Added the <code>$post</code> parameter.
- [`audio_submitbox_misc_sections`](https://developer.wordpress.org/reference/hooks/audio_submitbox_misc_sections/) - Added the <code>$post</code> parameter.
- [`delete_comment`](https://developer.wordpress.org/reference/hooks/delete_comment/) - Added the <code>$comment</code> parameter.
- [`deleted_comment`](https://developer.wordpress.org/reference/hooks/deleted_comment/) - Added the <code>$comment</code> parameter.
- [`editable_extensions`](https://developer.wordpress.org/reference/hooks/editable_extensions/) - Added the <code>$plugin</code> parameter.
- [`get_{$adjacent}_post_sort`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_sort/) - Added the <code>$order</code> parameter.
- [`media_submitbox_misc_sections`](https://developer.wordpress.org/reference/hooks/media_submitbox_misc_sections/) - Added the <code>$post</code> parameter.
- [`nav_menu_items_{$post_type_name}_recent`](https://developer.wordpress.org/reference/hooks/nav_menu_items_post_type_name_recent/) - Added the <code>$recent_args</code> parameter.
- [`new_admin_email_content`](https://developer.wordpress.org/reference/hooks/new_admin_email_content/) - This filter is no longer Multisite specific.
- [`new_user_email_content`](https://developer.wordpress.org/reference/hooks/new_user_email_content/) - This filter is no longer Multisite specific.
- [`number_format_i18n`](https://developer.wordpress.org/reference/hooks/number_format_i18n/) - The <code>$number</code> and <code>$decimals</code> parameters were added.
- [`oembed_fetch_url`](https://developer.wordpress.org/reference/hooks/oembed_fetch_url/) - The <code>dnt</code> (Do Not Track) query parameter was added to all oEmbed provider URLs.
- [`plugin_action_links_{$plugin_file}`](https://developer.wordpress.org/reference/hooks/plugin_action_links_plugin_file/) - The 'Edit' link was removed from the list of action links.
- [`plugin_action_links`](https://developer.wordpress.org/reference/hooks/plugin_action_links/) - The 'Edit' link was removed from the list of action links.
- [`post_submitbox_start`](https://developer.wordpress.org/reference/hooks/post_submitbox_start/) - Added the <code>$post</code> parameter.
- [`post_thumbnail_size`](https://developer.wordpress.org/reference/hooks/post_thumbnail_size/) - Added the <code>$post_id</code> parameter.
- [`pre_comment_approved`](https://developer.wordpress.org/reference/hooks/pre_comment_approved/) - Returning a WP_Error value from the filter will short-circuit comment insertion and allow skipping further processing.
- [`pre_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_option_option/) - The <code>$default_value</code> parameter was added.
- [`pre_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_site_option_option/) - The <code>$default_value</code> parameter was added.
- [`set_auth_cookie`](https://developer.wordpress.org/reference/hooks/set_auth_cookie/) - The <code>$token</code> parameter was added.
- [`set_comment_cookies`](https://developer.wordpress.org/reference/hooks/set_comment_cookies/) (4.9.6) - The <code>$cookies_consent</code> parameter was added.
- [`set_logged_in_cookie`](https://developer.wordpress.org/reference/hooks/set_logged_in_cookie/) - The <code>$token</code> parameter was added.
- [`spam_comment`](https://developer.wordpress.org/reference/hooks/spam_comment/) - Added the <code>$comment</code> parameter.
- [`spammed_comment`](https://developer.wordpress.org/reference/hooks/spammed_comment/) - Added the <code>$comment</code> parameter.
- [`trash_comment`](https://developer.wordpress.org/reference/hooks/trash_comment/) - Added the <code>$comment</code> parameter.
- [`trashed_comment`](https://developer.wordpress.org/reference/hooks/trashed_comment/) - Added the <code>$comment</code> parameter.
- [`unspam_comment`](https://developer.wordpress.org/reference/hooks/unspam_comment/) - Added the <code>$comment</code> parameter.
- [`unspammed_comment`](https://developer.wordpress.org/reference/hooks/unspammed_comment/) - Added the <code>$comment</code> parameter.
- [`untrash_comment`](https://developer.wordpress.org/reference/hooks/untrash_comment/) - Added the <code>$comment</code> parameter.
- [`untrashed_comment`](https://developer.wordpress.org/reference/hooks/untrashed_comment/) - Added the <code>$comment</code> parameter.
- [`widget_archives_args`](https://developer.wordpress.org/reference/hooks/widget_archives_args/) - Added the <code>$instance</code> parameter.
- [`widget_archives_dropdown_args`](https://developer.wordpress.org/reference/hooks/widget_archives_dropdown_args/) - Added the <code>$instance</code> parameter.
- [`widget_categories_args`](https://developer.wordpress.org/reference/hooks/widget_categories_args/) - Added the <code>$instance</code> parameter.
- [`widget_categories_dropdown_args`](https://developer.wordpress.org/reference/hooks/widget_categories_dropdown_args/) - Added the <code>$instance</code> parameter.
- [`widget_comments_args`](https://developer.wordpress.org/reference/hooks/widget_comments_args/) - Added the <code>$instance</code> parameter.
- [`widget_meta_poweredby`](https://developer.wordpress.org/reference/hooks/widget_meta_poweredby/) - Added the <code>$instance</code> parameter.
- [`widget_pages_args`](https://developer.wordpress.org/reference/hooks/widget_pages_args/) - Added the <code>$instance</code> parameter.
- [`widget_posts_args`](https://developer.wordpress.org/reference/hooks/widget_posts_args/) - Added the <code>$instance</code> parameter.
- [`widget_tag_cloud_args`](https://developer.wordpress.org/reference/hooks/widget_tag_cloud_args/) - Added the <code>$instance</code> parameter.
- [`wp_audio_shortcode_class`](https://developer.wordpress.org/reference/hooks/wp_audio_shortcode_class/) - The <code>$atts</code> parameter was added.
- [`wp_video_shortcode_class`](https://developer.wordpress.org/reference/hooks/wp_video_shortcode_class/) - The <code>$atts</code> parameter was added.

## WordPress 4.8

### New Actions

- [`print_default_editor_scripts`](https://developer.wordpress.org/reference/hooks/print_default_editor_scripts/) - Fires when the editor scripts are loaded for later initialization, after all scripts and settings are printed.

### New Filters

- [`enable_login_autofocus`](https://developer.wordpress.org/reference/hooks/enable_login_autofocus/) - Filters whether to print the call to `wp_attempt_focus()` on the login screen.
- [`file_mod_allowed`](https://developer.wordpress.org/reference/hooks/file_mod_allowed/) - Filters whether file modifications are allowed.
- [`minimum_site_name_length`](https://developer.wordpress.org/reference/hooks/minimum_site_name_length/) - Filters the minimum site name length required when validating a site signup.
- [`nav_menu_submenu_css_class`](https://developer.wordpress.org/reference/hooks/nav_menu_submenu_css_class/) - Filters the CSS class(es) applied to a menu list element.
- [`page_menu_link_attributes`](https://developer.wordpress.org/reference/hooks/page_menu_link_attributes/) - Filters the HTML attributes applied to a page menu item's anchor element.
- [`post_date_column_status`](https://developer.wordpress.org/reference/hooks/post_date_column_status/) - Filters the status text of the post.
- [`rest_oembed_ttl`](https://developer.wordpress.org/reference/hooks/rest_oembed_ttl/) - Filters the oEmbed TTL value (time to live).
- [`rest_pre_echo_response`](https://developer.wordpress.org/reference/hooks/rest_pre_echo_response/) (4.8.1) - Filters the REST API response.
- [`signup_site_meta`](https://developer.wordpress.org/reference/hooks/signup_site_meta/) - Filters the metadata for a site signup.
- [`signup_user_meta`](https://developer.wordpress.org/reference/hooks/signup_user_meta/) - Filters the metadata for a user signup.
- [`widget_custom_html_content`](https://developer.wordpress.org/reference/hooks/widget_custom_html_content/) (4.8.1) - Filters the content of the Custom HTML widget.
- [`widget_text_content`](https://developer.wordpress.org/reference/hooks/widget_text_content/) - Filters the content of the Text widget to apply changes expected from the visual (TinyMCE) editor.
- [`widget_{$this->id_base}_instance`](https://developer.wordpress.org/reference/hooks/widget_this-id_base_instance/) - Filters the media widget instance prior to rendering the media.
- [`wp_doing_cron`](https://developer.wordpress.org/reference/hooks/wp_doing_cron/) - Filters whether the current request is a WordPress cron request.

### Changes

- [`{$type}_template`](https://developer.wordpress.org/reference/hooks/type_template/) - The <code>$type</code> and <code>$templates</code> parameters were added.
- [`display_media_states`](https://developer.wordpress.org/reference/hooks/display_media_states/) - Added the <code>$post</code> parameter.
- [`media_library_show_audio_playlist`](https://developer.wordpress.org/reference/hooks/media_library_show_audio_playlist/) - The filter's default value is <code>true</code> rather than <code>null</code>.
- [`media_library_show_video_playlist`](https://developer.wordpress.org/reference/hooks/media_library_show_video_playlist/) - The filter's default value is <code>true</code> rather than <code>null</code>.
- [`rest_pre_insert_comment`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_comment/) - <code>$prepared_comment</code> can now be a WP_Error to short-circuit insertion.
- [`widget_text`](https://developer.wordpress.org/reference/hooks/widget_text/) (4.8.1) - The <code>$widget</code> param may now be a <code>WP_Widget_Custom_HTML</code> object in addition to a <code>WP_Widget_Text</code> object.
- [`wp_is_large_network`](https://developer.wordpress.org/reference/hooks/wp_is_large_network/) - The <code>$network_id</code> parameter has been added.

## WordPress 4.7

### New Actions

- [`change_locale`](https://developer.wordpress.org/reference/hooks/change_locale/) - Fires when the locale is switched to or restored.
- [`pre_trackback_post`](https://developer.wordpress.org/reference/hooks/pre_trackback_post/) - Fires before the trackback is added to a post.
- [`requests-{$hook}`](https://developer.wordpress.org/reference/hooks/requests-hook/) - Transforms a native Request hook to a WordPress action.
- [`rest_delete_comment`](https://developer.wordpress.org/reference/hooks/rest_delete_comment/) - Fires after a comment is deleted via the REST API.
- [`rest_delete_revision`](https://developer.wordpress.org/reference/hooks/rest_delete_revision/) - Fires after a revision is deleted via the REST API.
- [`rest_delete_user`](https://developer.wordpress.org/reference/hooks/rest_delete_user/) - Fires immediately after a user is deleted via the REST API.
- [`rest_delete_{$this->post_type}`](https://developer.wordpress.org/reference/hooks/rest_delete_this-post_type/) - Fires immediately after a single post is deleted or trashed via the REST API.
- [`rest_delete_{$this->taxonomy}`](https://developer.wordpress.org/reference/hooks/rest_delete_this-taxonomy/) - Fires after a single term is deleted via the REST API.
- [`rest_insert_attachment`](https://developer.wordpress.org/reference/hooks/rest_insert_attachment/) - Fires after a single attachment is created or updated via the REST API.
- [`rest_insert_comment`](https://developer.wordpress.org/reference/hooks/rest_insert_comment/) - Fires after a comment is created or updated via the REST API.
- [`rest_insert_user`](https://developer.wordpress.org/reference/hooks/rest_insert_user/) - Fires immediately after a user is created or updated via the REST API.
- [`rest_insert_{$this->post_type}`](https://developer.wordpress.org/reference/hooks/rest_insert_this-post_type/) - Fires after a single post is created or updated via the REST API.
- [`rest_insert_{$this->taxonomy}`](https://developer.wordpress.org/reference/hooks/rest_insert_this-taxonomy/) - Fires after a single term is created or updated via the REST API.
- [`restore_previous_locale`](https://developer.wordpress.org/reference/hooks/restore_previous_locale/) - Fires when the locale is restored to the previous one.
- [`switch_locale`](https://developer.wordpress.org/reference/hooks/switch_locale/) - Fires when the locale is switched.
- [`wp_roles_init`](https://developer.wordpress.org/reference/hooks/wp_roles_init/) - Fires after the roles have been initialized, allowing plugins to add their own roles.

### New Filters

- [`customize_changeset_save_data`](https://developer.wordpress.org/reference/hooks/customize_changeset_save_data/) - Filters the settings' data that will be persisted into the changeset.
- [`do_shortcode_tag`](https://developer.wordpress.org/reference/hooks/do_shortcode_tag/) - Filters the output created by a shortcode callback.
- [`fallback_intermediate_image_sizes`](https://developer.wordpress.org/reference/hooks/fallback_intermediate_image_sizes/) - Filters the image sizes generated for non-image mime types.
- [`get_available_languages`](https://developer.wordpress.org/reference/hooks/get_available_languages/) - Filters the list of available language codes.
- [`get_header_video_url`](https://developer.wordpress.org/reference/hooks/get_header_video_url/) (4.7.3) - Filters the header video URL.
- [`get_theme_starter_content`](https://developer.wordpress.org/reference/hooks/get_theme_starter_content/) - Filters the expanded array of starter content.
- [`handle_bulk_actions-{$screen}`](https://developer.wordpress.org/reference/hooks/handle_bulk_actions-screen/) - Fires when a custom bulk action should be handled.
- [`handle_network_bulk_actions-{$screen}`](https://developer.wordpress.org/reference/hooks/handle_network_bulk_actions-screen/) - Fires when a custom bulk action should be handled.
- [`header_video_settings`](https://developer.wordpress.org/reference/hooks/header_video_settings/) - Filters header video settings.
- [`is_header_video_active`](https://developer.wordpress.org/reference/hooks/is_header_video_active/) - Filters whether the custom header video is eligible to show on the current page.
- [`media_library_months_with_files`](https://developer.wordpress.org/reference/hooks/media_library_months_with_files/) (4.7.4) - Allows overriding the list of months displayed in the media library.
- [`media_library_show_audio_playlist`](https://developer.wordpress.org/reference/hooks/media_library_show_audio_playlist/) (4.7.4) - Allows showing or hiding the "Create Audio Playlist" button in the media library.
- [`media_library_show_video_playlist`](https://developer.wordpress.org/reference/hooks/media_library_show_video_playlist/) (4.7.4) - Allows showing or hiding the "Create Video Playlist" button in the media library.
- [`parent_theme_file_path`](https://developer.wordpress.org/reference/hooks/parent_theme_file_path/) - Filters the path to a file in the parent theme.
- [`parent_theme_file_uri`](https://developer.wordpress.org/reference/hooks/parent_theme_file_uri/) - Filters the URL to a file in the parent theme.
- [`post_password_required`](https://developer.wordpress.org/reference/hooks/post_password_required/) - Filters whether a post requires the user to supply a password.
- [`pre_do_shortcode_tag`](https://developer.wordpress.org/reference/hooks/pre_do_shortcode_tag/) - Filters whether to call a shortcode callback.
- [`register_setting_args`](https://developer.wordpress.org/reference/hooks/register_setting_args/) - Filters the registration arguments when registering a setting.
- [`rest_allow_anonymous_comments`](https://developer.wordpress.org/reference/hooks/rest_allow_anonymous_comments/) - Filters whether comments can be created via the REST API without authentication.
- [`rest_comment_collection_params`](https://developer.wordpress.org/reference/hooks/rest_comment_collection_params/) - Filters REST API collection parameters for the comments controller.
- [`rest_comment_query`](https://developer.wordpress.org/reference/hooks/rest_comment_query/) - Filters WP_Comment_Query arguments when querying comments via the REST API.
- [`rest_comment_trashable`](https://developer.wordpress.org/reference/hooks/rest_comment_trashable/) - Filters whether a comment can be trashed via the REST API.
- [`rest_pre_get_setting`](https://developer.wordpress.org/reference/hooks/rest_pre_get_setting/) - Filters the value of a setting recognized by the REST API.
- [`rest_pre_insert_comment`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_comment/) - Filters a comment before it is inserted via the REST API.
- [`rest_pre_insert_user`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_user/) - Filters user data before insertion via the REST API.
- [`rest_pre_insert_{$this->post_type}`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_this-post_type/) - Filters a post before it is inserted via the REST API.
- [`rest_pre_insert_{$this->taxonomy}`](https://developer.wordpress.org/reference/hooks/rest_pre_insert_this-taxonomy/) - Filters term data before inserting term via the REST API.
- [`rest_pre_update_setting`](https://developer.wordpress.org/reference/hooks/rest_pre_update_setting/) - Filters whether to preempt a setting value update via the REST API.
- [`rest_prepare_attachment`](https://developer.wordpress.org/reference/hooks/rest_prepare_attachment/) - Filters an attachment returned from the REST API.
- [`rest_prepare_comment`](https://developer.wordpress.org/reference/hooks/rest_prepare_comment/) - Filters a comment returned from the REST API.
- [`rest_prepare_post_type`](https://developer.wordpress.org/reference/hooks/rest_prepare_post_type/) - Filters a post type returned from the REST API.
- [`rest_prepare_revision`](https://developer.wordpress.org/reference/hooks/rest_prepare_revision/) - Filters a revision returned from the REST API.
- [`rest_prepare_status`](https://developer.wordpress.org/reference/hooks/rest_prepare_status/) - Filters a post status returned from the REST API.
- [`rest_prepare_taxonomy`](https://developer.wordpress.org/reference/hooks/rest_prepare_taxonomy/) - Filters a taxonomy returned from the REST API.
- [`rest_prepare_user`](https://developer.wordpress.org/reference/hooks/rest_prepare_user/) - Filters user data returned from the REST API.
- [`rest_prepare_{$this->post_type}`](https://developer.wordpress.org/reference/hooks/rest_prepare_this-post_type/) - Filters the post data for a REST API response.
- [`rest_prepare_{$this->taxonomy}`](https://developer.wordpress.org/reference/hooks/rest_prepare_this-taxonomy/) - Filters the term data for a REST API response.
- [`rest_preprocess_comment`](https://developer.wordpress.org/reference/hooks/rest_preprocess_comment/) - Filters a comment added via the REST API after it is prepared for insertion into the database.
- [`rest_query_var-{$key}`](https://developer.wordpress.org/reference/hooks/rest_query_var-key/) - Filters the query_vars used in get_items() for the constructed query.
- [`rest_request_after_callbacks`](https://developer.wordpress.org/reference/hooks/rest_request_after_callbacks/) - Filters the response immediately after executing any REST API callbacks.
- [`rest_request_before_callbacks`](https://developer.wordpress.org/reference/hooks/rest_request_before_callbacks/) - Filters the response before executing any REST API callbacks.
- [`rest_user_collection_params`](https://developer.wordpress.org/reference/hooks/rest_user_collection_params/) - Filters REST API collection parameters for the users controller.
- [`rest_user_query`](https://developer.wordpress.org/reference/hooks/rest_user_query/) - Filters WP_User_Query arguments when querying users via the REST API.
- [`rest_{$this->post_type}_collection_params`](https://developer.wordpress.org/reference/hooks/rest_this-post_type_collection_params/) - Filters collection parameters for the posts controller.
- [`rest_{$this->post_type}_query`](https://developer.wordpress.org/reference/hooks/rest_this-post_type_query/) - Filters WP_Query arguments when querying posts via the REST API.
- [`rest_{$this->post_type}_trashable`](https://developer.wordpress.org/reference/hooks/rest_this-post_type_trashable/) - Filters whether a post is trashable.
- [`rest_{$this->taxonomy}_collection_params`](https://developer.wordpress.org/reference/hooks/rest_this-taxonomy_collection_params/) - Filters collection parameters for the terms controller.
- [`rest_{$this->taxonomy}_query`](https://developer.wordpress.org/reference/hooks/rest_this-taxonomy_query/) - Filters get_terms() arguments when querying terms via the REST API.
- [`sanitize_textarea_field`](https://developer.wordpress.org/reference/hooks/sanitize_textarea_field/) - Filters a sanitized textarea field string.
- [`send_auth_cookies`](https://developer.wordpress.org/reference/hooks/send_auth_cookies/) (4.7.4) - Allows preventing auth cookies from actually being sent to the client.
- [`smilies`](https://developer.wordpress.org/reference/hooks/smilies/) - Filters all the smilies.
- [`strip_shortcodes_tagnames`](https://developer.wordpress.org/reference/hooks/strip_shortcodes_tagnames/) - Filters the list of shortcode tags to remove from the content.
- [`theme_file_path`](https://developer.wordpress.org/reference/hooks/theme_file_path/) - Filters the path to a file in the theme.
- [`theme_file_uri`](https://developer.wordpress.org/reference/hooks/theme_file_uri/) - Filters the URL to a file in the theme.
- [`theme_scandir_exclusions`](https://developer.wordpress.org/reference/hooks/theme_scandir_exclusions/) (4.7.4) - Filters the array of excluded directories and files while scanning theme folder.
- [`update_custom_css_data`](https://developer.wordpress.org/reference/hooks/update_custom_css_data/) - Filters the `css` (`post_content`) and `preprocessed` (`post_content_filtered`) args for a `custom_css` post being updated.
- [`wp_doing_ajax`](https://developer.wordpress.org/reference/hooks/wp_doing_ajax/) - Filters whether the current request is a WordPress Ajax request.
- [`wp_get_custom_css`](https://developer.wordpress.org/reference/hooks/wp_get_custom_css/) - Filters the custom CSS output into the head element.
- [`wp_insert_term_data`](https://developer.wordpress.org/reference/hooks/wp_insert_term_data/) - Filters term data before it is inserted into the database.
- [`wp_is_comment_flood`](https://developer.wordpress.org/reference/hooks/wp_is_comment_flood/) - Filters whether a comment is part of a comment flood.
- [`wp_query_search_exclusion_prefix`](https://developer.wordpress.org/reference/hooks/wp_query_search_exclusion_prefix/) - Filters the prefix that indicates that a search term should be excluded from results.
- [`wp_update_comment_data`](https://developer.wordpress.org/reference/hooks/wp_update_comment_data/) - Filters the comment data immediately before it is updated in the database.
- [`wp_update_term_data`](https://developer.wordpress.org/reference/hooks/wp_update_term_data/) - Filters term data before it is updated in the database.
- [`{$type}_template_hierarchy`](https://developer.wordpress.org/reference/hooks/type_template_hierarchy/) - Filters the list of template filenames that are searched for when retrieving a template to use.

### Changes

- [`add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/add_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`add_site_option`](https://developer.wordpress.org/reference/hooks/add_site_option/) - The <code>$network_id</code> parameter was added.
- [`add_term_relationship`](https://developer.wordpress.org/reference/hooks/add_term_relationship/) - Added the <code>$taxonomy</code> parameter.
- [`added_term_relationship`](https://developer.wordpress.org/reference/hooks/added_term_relationship/) - Added the <code>$taxonomy</code> parameter.
- [`check_comment_flood`](https://developer.wordpress.org/reference/hooks/check_comment_flood/) - The <code>$avoid_die</code> parameter was added.
- [`comment_max_links_url`](https://developer.wordpress.org/reference/hooks/comment_max_links_url/) - Added the <code>$comment</code> parameter.
- [`customize_nav_menu_available_item_types`](https://developer.wordpress.org/reference/hooks/customize_nav_menu_available_item_types/) - Each array item now includes a <code>$type_label</code> in addition to <code>$title</code>, <code>$type</code>, and <code>$object</code>.
- [`default_option_{$option}`](https://developer.wordpress.org/reference/hooks/default_option_option/) - The <code>$passed_default</code> parameter was added to distinguish between a <code>false</code> value and the default parameter value.
- [`default_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/default_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`delete_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/delete_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`delete_site_option`](https://developer.wordpress.org/reference/hooks/delete_site_option/) - The <code>$network_id</code> parameter was added.
- [`delete_term_relationships`](https://developer.wordpress.org/reference/hooks/delete_term_relationships/) - Added the <code>$taxonomy</code> parameter.
- [`deleted_term_relationships`](https://developer.wordpress.org/reference/hooks/deleted_term_relationships/) - Added the <code>$taxonomy</code> parameter.
- [`get_page_of_comment`](https://developer.wordpress.org/reference/hooks/get_page_of_comment/) - Introduced the <code>$comment_id</code> parameter.
- [`pre_add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_add_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`pre_delete_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_delete_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`pre_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`pre_update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_update_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`site_option_{$option}`](https://developer.wordpress.org/reference/hooks/site_option_option/) - The <code>$network_id</code> parameter was added.
- [`theme_{$post_type}_templates`](https://developer.wordpress.org/reference/hooks/theme_post_type_templates/) - Added the <code>$post_type</code> parameter.
- [`update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/update_site_option_option/) - The <code>$network_id</code> parameter was added.
- [`update_site_option`](https://developer.wordpress.org/reference/hooks/update_site_option/) - The <code>$network_id</code> parameter was added.
- [`user_profile_picture_description`](https://developer.wordpress.org/reference/hooks/user_profile_picture_description/) - Added the <code>$profile_user</code> parameter.
- [`wp_resource_hints`](https://developer.wordpress.org/reference/hooks/wp_resource_hints/) - The <code>$urls</code> parameter accepts arrays of specific HTML attributes as its child elements.

## WordPress 4.6

### New Actions

- [`admin_print_footer_scripts-{$hook_suffix}`](https://developer.wordpress.org/reference/hooks/admin_print_footer_scripts-hook_suffix/) - Prints scripts and data queued for the footer.
- [`clean_network_cache`](https://developer.wordpress.org/reference/hooks/clean_network_cache/) - Fires immediately after a network has been removed from the object cache.
- [`clean_site_cache`](https://developer.wordpress.org/reference/hooks/clean_site_cache/) - Fires immediately after a site has been removed from the object cache.
- [`customize_save_validation_before`](https://developer.wordpress.org/reference/hooks/customize_save_validation_before/) - Fires before save validation happens.
- [`deprecated_hook_run`](https://developer.wordpress.org/reference/hooks/deprecated_hook_run/) - Fires when a deprecated hook is called.
- [`login_header`](https://developer.wordpress.org/reference/hooks/login_header/) - Fires in the login page header after the body tag is opened.
- [`ms_loaded`](https://developer.wordpress.org/reference/hooks/ms_loaded/) - Fires after the current site and network have been detected and loaded in multisite's bootstrap.
- [`parse_network_query`](https://developer.wordpress.org/reference/hooks/parse_network_query/) - Fires after the network query vars have been parsed.
- [`parse_site_query`](https://developer.wordpress.org/reference/hooks/parse_site_query/) - Fires after the site query vars have been parsed.
- [`parse_term_query`](https://developer.wordpress.org/reference/hooks/parse_term_query/) - Fires after term query vars have been parsed.
- [`post_action_{$action}`](https://developer.wordpress.org/reference/hooks/post_action_action/) - Fires for a given custom post action request.
- [`post_stuck`](https://developer.wordpress.org/reference/hooks/post_stuck/) - Fires once a post has been added to the sticky list.
- [`post_unstuck`](https://developer.wordpress.org/reference/hooks/post_unstuck/) - Fires once a post has been removed from the sticky list.
- [`pre_get_networks`](https://developer.wordpress.org/reference/hooks/pre_get_networks/) - Fires before networks are retrieved.
- [`pre_get_sites`](https://developer.wordpress.org/reference/hooks/pre_get_sites/) - Fires before sites are retrieved.
- [`pre_get_terms`](https://developer.wordpress.org/reference/hooks/pre_get_terms/) - Fires before terms are retrieved.
- [`wp_edit_form_attachment_display`](https://developer.wordpress.org/reference/hooks/wp_edit_form_attachment_display/) - Fires when an attachment type can't be rendered in the edit form.

### New Filters

- [`customize_validate_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_validate_this-id/) - Validates a Customize setting value.
- [`deprecated_hook_trigger_error`](https://developer.wordpress.org/reference/hooks/deprecated_hook_trigger_error/) - Filters whether to trigger deprecated hook errors.
- [`disable_categories_dropdown`](https://developer.wordpress.org/reference/hooks/disable_categories_dropdown/) - Filters whether to remove the 'Categories' drop-down from the post list table.
- [`emoji_svg_ext`](https://developer.wordpress.org/reference/hooks/emoji_svg_ext/) - Filters the extension of the emoji SVG files.
- [`emoji_svg_url`](https://developer.wordpress.org/reference/hooks/emoji_svg_url/) - Filters the URL where emoji SVG images are hosted.
- [`enable_loading_advanced_cache_dropin`](https://developer.wordpress.org/reference/hooks/enable_loading_advanced_cache_dropin/) - Filters whether to enable loading of the advanced-cache.php drop-in.
- [`enable_maintenance_mode`](https://developer.wordpress.org/reference/hooks/enable_maintenance_mode/) - Filters whether to enable maintenance mode.
- [`enable_wp_debug_mode_checks`](https://developer.wordpress.org/reference/hooks/enable_wp_debug_mode_checks/) - Filters whether to allow the debug mode check to occur.
- [`found_networks_query`](https://developer.wordpress.org/reference/hooks/found_networks_query/) - Filters the query used to retrieve found network count.
- [`found_sites_query`](https://developer.wordpress.org/reference/hooks/found_sites_query/) - Filters the query used to retrieve found site count.
- [`get_canonical_url`](https://developer.wordpress.org/reference/hooks/get_canonical_url/) - Filters the canonical URL for a post.
- [`get_network`](https://developer.wordpress.org/reference/hooks/get_network/) - Fires after a network is retrieved.
- [`get_site`](https://developer.wordpress.org/reference/hooks/get_site/) - Fires after a site is retrieved.
- [`ms_sites_list_table_query_args`](https://developer.wordpress.org/reference/hooks/ms_sites_list_table_query_args/) - Filters the arguments for the site query in the sites list table.
- [`network_edit_site_nav_links`](https://developer.wordpress.org/reference/hooks/network_edit_site_nav_links/) - Filters the links that appear on site-editing network pages.
- [`networks_clauses`](https://developer.wordpress.org/reference/hooks/networks_clauses/) - Filters the network query clauses.
- [`posts_pre_query`](https://developer.wordpress.org/reference/hooks/posts_pre_query/) - Filters the posts array before the query takes place.
- [`pre_get_blogs_of_user`](https://developer.wordpress.org/reference/hooks/pre_get_blogs_of_user/) - Filters the list of a user's sites before it is populated.
- [`redirect_term_location`](https://developer.wordpress.org/reference/hooks/redirect_term_location/) - Filters the taxonomy redirect destination URL.
- [`register_meta_args`](https://developer.wordpress.org/reference/hooks/register_meta_args/) - Filters the registration arguments when registering meta.
- [`site_details`](https://developer.wordpress.org/reference/hooks/site_details/) - Filters a site's extended properties.
- [`site_search_columns`](https://developer.wordpress.org/reference/hooks/site_search_columns/) - Filters the columns to search in a WP_Site_Query search.
- [`sites_clauses`](https://developer.wordpress.org/reference/hooks/sites_clauses/) - Filters the site query clauses.
- [`the_networks`](https://developer.wordpress.org/reference/hooks/the_networks/) - Filters the network query results.
- [`the_post_thumbnail_caption`](https://developer.wordpress.org/reference/hooks/the_post_thumbnail_caption/) - Filters the displayed post thumbnail caption.
- [`the_sites`](https://developer.wordpress.org/reference/hooks/the_sites/) - Filters the site query results.
- [`wp_get_attachment_caption`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_caption/) - Filters the attachment caption.
- [`wp_resource_hints`](https://developer.wordpress.org/reference/hooks/wp_resource_hints/) - Filters domains and URLs for resource hints of the given relation type.
- [`wxr_export_skip_termmeta`](https://developer.wordpress.org/reference/hooks/wxr_export_skip_termmeta/) - Filters whether to selectively skip term meta used for WXR exports.
- [`{$context}_memory_limit`](https://developer.wordpress.org/reference/hooks/context_memory_limit/) - Filters the memory limit allocated for an arbitrary context.

### Changes

- [`admin_memory_limit`](https://developer.wordpress.org/reference/hooks/admin_memory_limit/) - The default now takes the original <code>memory_limit</code> into account.
- [`admin_post_thumbnail_html`](https://developer.wordpress.org/reference/hooks/admin_post_thumbnail_html/) - Added the <code>$thumbnail_id</code> parameter.
- [`customize_value_{$id_base}`](https://developer.wordpress.org/reference/hooks/customize_value_id_base/) - Added the <code>$setting</code> instance as the second parameter.
- [`date_query_valid_columns`](https://developer.wordpress.org/reference/hooks/date_query_valid_columns/) - Added 'registered' and 'last_updated' to the default recognized columns.
- [`edit_comment`](https://developer.wordpress.org/reference/hooks/edit_comment/) - Added the <code>$data</code> parameter.
- [`fs_ftp_connection_types`](https://developer.wordpress.org/reference/hooks/fs_ftp_connection_types/) - The <code>$context</code> parameter default changed from <code>false</code> to an empty string.
- [`get_custom_logo`](https://developer.wordpress.org/reference/hooks/get_custom_logo/) - Added the <code>$blog_id</code> parameter.
- [`get_terms`](https://developer.wordpress.org/reference/hooks/get_terms/) - Added the <code>$term_query</code> parameter.
- [`get_the_modified_date`](https://developer.wordpress.org/reference/hooks/get_the_modified_date/) - Added the <code>$post</code> parameter.
- [`get_the_modified_time`](https://developer.wordpress.org/reference/hooks/get_the_modified_time/) - Added the <code>$post</code> parameter.
- [`image_memory_limit`](https://developer.wordpress.org/reference/hooks/image_memory_limit/) - The default now takes the original <code>memory_limit</code> into account.
- [`nav_menu_items_{$post_type_name}`](https://developer.wordpress.org/reference/hooks/nav_menu_items_post_type_name/) - Converted the <code>$post_type</code> parameter to accept a WP_Post_Type object.
- [`registered_post_type`](https://developer.wordpress.org/reference/hooks/registered_post_type/) - Converted the <code>$post_type</code> parameter to accept a WP_Post_Type object.
- [`request_filesystem_credentials`](https://developer.wordpress.org/reference/hooks/request_filesystem_credentials/) - The <code>$context</code> parameter default changed from <code>false</code> to an empty string.
- [`restrict_manage_posts`](https://developer.wordpress.org/reference/hooks/restrict_manage_posts/) - The <code>$which</code> parameter was added.
- [`restrict_manage_users`](https://developer.wordpress.org/reference/hooks/restrict_manage_users/) - The <code>$which</code> parameter was added.
- [`upgrader_process_complete`](https://developer.wordpress.org/reference/hooks/upgrader_process_complete/) - <code>$translations</code> was added as a possible argument to <code>$hook_extra</code>.
- [`xmlrpc_prepare_post_type`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_post_type/) - Converted the <code>$post_type</code> parameter to accept a WP_Post_Type object.

## WordPress 4.5

### New Actions

- [`clean_comment_cache`](https://developer.wordpress.org/reference/hooks/clean_comment_cache/) - Fires immediately after a comment has been removed from the object cache.
- [`customize_render_partials_after`](https://developer.wordpress.org/reference/hooks/customize_render_partials_after/) - Fires immediately after partials are rendered.
- [`customize_render_partials_before`](https://developer.wordpress.org/reference/hooks/customize_render_partials_before/) - Fires immediately before partials are rendered.
- [`metadata_lazyloader_queued_objects`](https://developer.wordpress.org/reference/hooks/metadata_lazyloader_queued_objects/) - Fires after objects are added to the metadata lazy-load queue.
- [`network_site_new_form`](https://developer.wordpress.org/reference/hooks/network_site_new_form/) - Fires at the end of the new site form in network admin.
- [`network_user_new_form`](https://developer.wordpress.org/reference/hooks/network_user_new_form/) - Fires at the end of the new user form in network admin.
- [`pre_network_site_new_created_user`](https://developer.wordpress.org/reference/hooks/pre_network_site_new_created_user/) - Fires immediately before a new user is created via the network site-new.php page.
- [`pre_uninstall_plugin`](https://developer.wordpress.org/reference/hooks/pre_uninstall_plugin/) - Fires in uninstall_plugin() immediately before the plugin is uninstalled.
- [`unregistered_post_type`](https://developer.wordpress.org/reference/hooks/unregistered_post_type/) - Fires after a post type was unregistered.
- [`unregistered_taxonomy`](https://developer.wordpress.org/reference/hooks/unregistered_taxonomy/) - Fires after a taxonomy is unregistered.
- [`{$taxonomy}_term_edit_form_top`](https://developer.wordpress.org/reference/hooks/taxonomy_term_edit_form_top/) - Fires at the beginning of the Edit Term form.

### New Filters

- [`comments_template_query_args`](https://developer.wordpress.org/reference/hooks/comments_template_query_args/) - Filters the arguments used to query comments in comments_template().
- [`customize_dynamic_partial_args`](https://developer.wordpress.org/reference/hooks/customize_dynamic_partial_args/) - Filters a dynamic partial's constructor arguments.
- [`customize_dynamic_partial_class`](https://developer.wordpress.org/reference/hooks/customize_dynamic_partial_class/) - Filters the class used to construct partials.
- [`customize_nav_menu_searched_items`](https://developer.wordpress.org/reference/hooks/customize_nav_menu_searched_items/) - Filters the available menu items during a search request.
- [`customize_partial_render`](https://developer.wordpress.org/reference/hooks/customize_partial_render/) - Filters partial rendering.
- [`customize_partial_render_{$partial->id}`](https://developer.wordpress.org/reference/hooks/customize_partial_render_partial-id/) - Filters partial rendering for a specific partial.
- [`customize_previewable_devices`](https://developer.wordpress.org/reference/hooks/customize_previewable_devices/) - Filters the available devices to allow previewing in the Customizer.
- [`customize_render_partials_response`](https://developer.wordpress.org/reference/hooks/customize_render_partials_response/) - Filters the response from rendering the partials.
- [`get_custom_logo`](https://developer.wordpress.org/reference/hooks/get_custom_logo/) - Filters the custom logo output.
- [`image_strip_meta`](https://developer.wordpress.org/reference/hooks/image_strip_meta/) - Filters whether to strip metadata from images when they're resized.
- [`network_allowed_themes`](https://developer.wordpress.org/reference/hooks/network_allowed_themes/) - Filters the array of themes allowed on the network.
- [`pre_handle_404`](https://developer.wordpress.org/reference/hooks/pre_handle_404/) - Filters whether to short-circuit default header status handling.
- [`pre_oembed_result`](https://developer.wordpress.org/reference/hooks/pre_oembed_result/) (4.5.3) - Filters the oEmbed result before any HTTP requests are made.
- [`pre_wp_update_comment_count_now`](https://developer.wordpress.org/reference/hooks/pre_wp_update_comment_count_now/) - Filters a post's comment count before it is updated in the database.
- [`rest_request_from_url`](https://developer.wordpress.org/reference/hooks/rest_request_from_url/) - Filters the REST API request generated from a URL.
- [`rest_response_link_curies`](https://developer.wordpress.org/reference/hooks/rest_response_link_curies/) - Filters extra CURIEs available on REST API responses.
- [`site_allowed_themes`](https://developer.wordpress.org/reference/hooks/site_allowed_themes/) - Filters the array of themes allowed on the site.
- [`wp_calculate_image_srcset_meta`](https://developer.wordpress.org/reference/hooks/wp_calculate_image_srcset_meta/) - Pre-filters the image meta to be able to fix inconsistencies in the stored data.
- [`wp_get_comment_fields_max_lengths`](https://developer.wordpress.org/reference/hooks/wp_get_comment_fields_max_lengths/) - Filters the lengths for the comment form fields.
- [`wp_unique_filename`](https://developer.wordpress.org/reference/hooks/wp_unique_filename/) - Filters the result when generating a unique file name.

### Changes

- [`_wp_post_revision_fields`](https://developer.wordpress.org/reference/hooks/_wp_post_revision_fields/) - The <code>$post</code> parameter was added.
- [`authenticate`](https://developer.wordpress.org/reference/hooks/authenticate/) - <code>$username</code> now accepts an email address.
- [`clean_term_cache`](https://developer.wordpress.org/reference/hooks/clean_term_cache/) - Added the <code>$clean_taxonomy</code> parameter.
- [`comment_post`](https://developer.wordpress.org/reference/hooks/comment_post/) - The <code>$commentdata</code> parameter was added.
- [`cron_request`](https://developer.wordpress.org/reference/hooks/cron_request/) - The <code>$doing_wp_cron</code> parameter was added.
- [`delete_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/delete_taxonomy/) - Introduced the <code>$object_ids</code> argument.
- [`delete_term`](https://developer.wordpress.org/reference/hooks/delete_term/) - Introduced the <code>$object_ids</code> argument.
- [`delete_user_form`](https://developer.wordpress.org/reference/hooks/delete_user_form/) - The <code>$user_ids</code> parameter was added.
- [`deprecated_constructor_run`](https://developer.wordpress.org/reference/hooks/deprecated_constructor_run/) - Added the <code>$parent_class</code> parameter.
- [`embed_thumbnail_image_shape`](https://developer.wordpress.org/reference/hooks/embed_thumbnail_image_shape/) - Added <code>$thumbnail_id</code> parameter.
- [`embed_thumbnail_image_size`](https://developer.wordpress.org/reference/hooks/embed_thumbnail_image_size/) - Added <code>$thumbnail_id</code> parameter.
- [`get_archives_link`](https://developer.wordpress.org/reference/hooks/get_archives_link/) - Added the <code>$url</code>, <code>$text</code>, <code>$format</code>, <code>$before</code>, and <code>$after</code> parameters.
- [`get_the_excerpt`](https://developer.wordpress.org/reference/hooks/get_the_excerpt/) - Introduced the <code>$post</code> parameter.
- [`plugins_update_check_locales`](https://developer.wordpress.org/reference/hooks/plugins_update_check_locales/) - The default value of the <code>$locales</code> parameter changed to include all locales.
- [`privacy_on_link_title`](https://developer.wordpress.org/reference/hooks/privacy_on_link_title/) - The default for <code>$title</code> was updated to an empty string.
- [`rest_dispatch_request`](https://developer.wordpress.org/reference/hooks/rest_dispatch_request/) - Added <code>$route</code> and <code>$handler</code> parameters.
- [`rest_post_dispatch`](https://developer.wordpress.org/reference/hooks/rest_post_dispatch/) - Applied to embedded responses.
- [`style_loader_tag`](https://developer.wordpress.org/reference/hooks/style_loader_tag/) - Introduced the <code>$media</code> parameter.
- [`switch_theme`](https://developer.wordpress.org/reference/hooks/switch_theme/) - Introduced the <code>$old_theme</code> parameter.
- [`themes_update_check_locales`](https://developer.wordpress.org/reference/hooks/themes_update_check_locales/) - The default value of the <code>$locales</code> parameter changed to include all locales.
- [`wp_login_failed`](https://developer.wordpress.org/reference/hooks/wp_login_failed/) - The value of <code>$username</code> can now be an email address.

## WordPress 4.4

### New Actions

- [`after_password_reset`](https://developer.wordpress.org/reference/hooks/after_password_reset/) - Fires after the user's password is reset.
- [`after_signup_site`](https://developer.wordpress.org/reference/hooks/after_signup_site/) - Fires after site signup information has been written to the database.
- [`after_signup_user`](https://developer.wordpress.org/reference/hooks/after_signup_user/) - Fires after a user's signup information has been written to the database.
- [`attachment_updated`](https://developer.wordpress.org/reference/hooks/attachment_updated/) - Fires once an existing attachment has been updated.
- [`before_signup_header`](https://developer.wordpress.org/reference/hooks/before_signup_header/) - Fires before the Site Sign-up page is loaded.
- [`clean_user_cache`](https://developer.wordpress.org/reference/hooks/clean_user_cache/) - Fires immediately after the given user's cache is cleaned.
- [`customize_post_value_set`](https://developer.wordpress.org/reference/hooks/customize_post_value_set/) - Announces when any setting's unsanitized post value has been set.
- [`customize_post_value_set_{$setting_id}`](https://developer.wordpress.org/reference/hooks/customize_post_value_set_setting_id/) - Announces when a specific setting's unsanitized post value has been set.
- [`delete_plugin`](https://developer.wordpress.org/reference/hooks/delete_plugin/) - Fires immediately before a plugin deletion attempt.
- [`delete_widget`](https://developer.wordpress.org/reference/hooks/delete_widget/) - Fires immediately after a widget has been marked for deletion.
- [`deleted_plugin`](https://developer.wordpress.org/reference/hooks/deleted_plugin/) - Fires immediately after a plugin deletion attempt.
- [`edit_user_created_user`](https://developer.wordpress.org/reference/hooks/edit_user_created_user/) - Fires after a new user has been created.
- [`embed_content`](https://developer.wordpress.org/reference/hooks/embed_content/) - Prints additional content after the embed excerpt.
- [`embed_content_meta`](https://developer.wordpress.org/reference/hooks/embed_content_meta/) - Prints additional meta content in the embed template.
- [`embed_footer`](https://developer.wordpress.org/reference/hooks/embed_footer/) - Prints scripts or data before the closing body tag in the embed template.
- [`embed_head`](https://developer.wordpress.org/reference/hooks/embed_head/) - Prints scripts or data in the embed template head tag.
- [`enqueue_embed_scripts`](https://developer.wordpress.org/reference/hooks/enqueue_embed_scripts/) - Fires when scripts and styles are enqueued for the embed iframe.
- [`invite_user`](https://developer.wordpress.org/reference/hooks/invite_user/) - Fires immediately after an existing user is invited to join the site, but before the notification is sent.
- [`manage_posts_extra_tablenav`](https://developer.wordpress.org/reference/hooks/manage_posts_extra_tablenav/) - Fires immediately following the closing "actions" div in the tablenav for the posts list table.
- [`ms_network_not_found`](https://developer.wordpress.org/reference/hooks/ms_network_not_found/) - Fires when a network cannot be found based on the requested domain and path.
- [`network_site_new_created_user`](https://developer.wordpress.org/reference/hooks/network_site_new_created_user/) - Fires after a new user has been created via the network site-new.php page.
- [`network_site_users_created_user`](https://developer.wordpress.org/reference/hooks/network_site_users_created_user/) - Fires after a user has been created via the network site-users.php page.
- [`network_user_new_created_user`](https://developer.wordpress.org/reference/hooks/network_user_new_created_user/) - Fires after a new user has been created via the network user-new.php page.
- [`page_attributes_meta_box_template`](https://developer.wordpress.org/reference/hooks/page_attributes_meta_box_template/) - Fires immediately after the label inside the 'Template' section of the 'Page Attributes' meta box.
- [`post_submitbox_minor_actions`](https://developer.wordpress.org/reference/hooks/post_submitbox_minor_actions/) - Fires after the Save Draft (or Save as Pending) and Preview (or Preview Changes) buttons in the Publish meta box.
- [`pre_auto_update`](https://developer.wordpress.org/reference/hooks/pre_auto_update/) - Fires immediately prior to an auto-update.
- [`register_new_user`](https://developer.wordpress.org/reference/hooks/register_new_user/) - Fires after a new user registration has been recorded.
- [`rest_api_init`](https://developer.wordpress.org/reference/hooks/rest_api_init/) - Fires when preparing to serve a REST API request.
- [`wp_add_nav_menu_item`](https://developer.wordpress.org/reference/hooks/wp_add_nav_menu_item/) - Fires immediately after a new navigation menu item has been added.
- [`wp_mail_failed`](https://developer.wordpress.org/reference/hooks/wp_mail_failed/) - Fires after a PHPMailer exception is caught.
- [`wp_verify_nonce_failed`](https://developer.wordpress.org/reference/hooks/wp_verify_nonce_failed/) - Fires when nonce verification fails.

### New Filters

- [`admin_post_thumbnail_size`](https://developer.wordpress.org/reference/hooks/admin_post_thumbnail_size/) - Filters the size used to display the post thumbnail image in the 'Featured image' meta box.
- [`comment_excerpt_length`](https://developer.wordpress.org/reference/hooks/comment_excerpt_length/) - Filters the maximum number of words used in the comment excerpt.
- [`comment_form_fields`](https://developer.wordpress.org/reference/hooks/comment_form_fields/) - Filters the comment form fields, including the textarea.
- [`content_pagination`](https://developer.wordpress.org/reference/hooks/content_pagination/) - Filters the "pages" derived from splitting the post content.
- [`customize_loaded_components`](https://developer.wordpress.org/reference/hooks/customize_loaded_components/) - Filters the core Customizer components to load.
- [`dashboard_recent_drafts_query_args`](https://developer.wordpress.org/reference/hooks/dashboard_recent_drafts_query_args/) - Filters the post query arguments for the 'Recent Drafts' dashboard widget.
- [`dashboard_secondary_items`](https://developer.wordpress.org/reference/hooks/dashboard_secondary_items/) - Filters the number of secondary link items for the 'WordPress Events and News' dashboard widget.
- [`default_hidden_columns`](https://developer.wordpress.org/reference/hooks/default_hidden_columns/) - Filters the default list of hidden columns.
- [`document_title_parts`](https://developer.wordpress.org/reference/hooks/document_title_parts/) - Filters the parts of the document title.
- [`document_title_separator`](https://developer.wordpress.org/reference/hooks/document_title_separator/) - Filters the separator for the document title.
- [`duplicate_comment_id`](https://developer.wordpress.org/reference/hooks/duplicate_comment_id/) - Filters the ID, if any, of the duplicate comment found when creating a new comment.
- [`embed_html`](https://developer.wordpress.org/reference/hooks/embed_html/) - Filters the embed HTML output for a given post.
- [`embed_site_title_html`](https://developer.wordpress.org/reference/hooks/embed_site_title_html/) - Filters the site title HTML in the embed footer.
- [`embed_thumbnail_image_shape`](https://developer.wordpress.org/reference/hooks/embed_thumbnail_image_shape/) - Filters the thumbnail shape for use in the embed template.
- [`embed_thumbnail_image_size`](https://developer.wordpress.org/reference/hooks/embed_thumbnail_image_size/) - Filters the thumbnail image size for use in the embed template.
- [`enclosure_links`](https://developer.wordpress.org/reference/hooks/enclosure_links/) - Filters the list of enclosure links before querying the database.
- [`expiration_of_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/expiration_of_site_transient_transient/) - Filters the expiration for a site transient before its value is set.
- [`expiration_of_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/expiration_of_transient_transient/) - Filters the expiration for a transient before its value is set.
- [`export_wp_filename`](https://developer.wordpress.org/reference/hooks/export_wp_filename/) - Filters the export filename.
- [`feed_links_show_comments_feed`](https://developer.wordpress.org/reference/hooks/feed_links_show_comments_feed/) - Filters whether to display the comments feed link.
- [`feed_links_show_posts_feed`](https://developer.wordpress.org/reference/hooks/feed_links_show_posts_feed/) - Filters whether to display the posts feed link.
- [`found_comments_query`](https://developer.wordpress.org/reference/hooks/found_comments_query/) - Filters the query used to retrieve found comment count.
- [`get_header_image_tag`](https://developer.wordpress.org/reference/hooks/get_header_image_tag/) - Filters the markup of header images.
- [`get_page_of_comment`](https://developer.wordpress.org/reference/hooks/get_page_of_comment/) - Filters the calculated page on which a comment appears.
- [`get_page_uri`](https://developer.wordpress.org/reference/hooks/get_page_uri/) - Filters the URI for a page.
- [`get_post_status`](https://developer.wordpress.org/reference/hooks/get_post_status/) - Filters the post status.
- [`get_role_list`](https://developer.wordpress.org/reference/hooks/get_role_list/) - Filters the returned array of translated role names for a user.
- [`get_sample_permalink`](https://developer.wordpress.org/reference/hooks/get_sample_permalink/) - Filters the sample permalink.
- [`get_site_icon_url`](https://developer.wordpress.org/reference/hooks/get_site_icon_url/) - Filters the site icon URL.
- [`get_terms_defaults`](https://developer.wordpress.org/reference/hooks/get_terms_defaults/) - Filters the terms query default arguments.
- [`get_{$adjacent}_post_excluded_terms`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_excluded_terms/) - Filters the IDs of terms excluded from adjacent post queries.
- [`hidden_columns`](https://developer.wordpress.org/reference/hooks/hidden_columns/) - Filters the list of hidden columns.
- [`illegal_user_logins`](https://developer.wordpress.org/reference/hooks/illegal_user_logins/) - Filters the list of disallowed usernames.
- [`image_get_intermediate_size`](https://developer.wordpress.org/reference/hooks/image_get_intermediate_size/) - Filters the output of image_get_intermediate_size()
- [`insert_user_meta`](https://developer.wordpress.org/reference/hooks/insert_user_meta/) - Filters a user's meta values and keys immediately after the user is created or updated and before any user meta is inserted or updated.
- [`max_srcset_image_width`](https://developer.wordpress.org/reference/hooks/max_srcset_image_width/) - Filters the maximum image width to be included in a 'srcset' attribute.
- [`mejs_settings`](https://developer.wordpress.org/reference/hooks/mejs_settings/) - Filters the MediaElement configuration settings.
- [`nav_menu_item_args`](https://developer.wordpress.org/reference/hooks/nav_menu_item_args/) - Filters the arguments for a single nav menu item.
- [`nav_menu_item_title`](https://developer.wordpress.org/reference/hooks/nav_menu_item_title/) - Filters a menu item's title.
- [`navigation_markup_template`](https://developer.wordpress.org/reference/hooks/navigation_markup_template/) - Filters the navigation markup template.
- [`notify_moderator`](https://developer.wordpress.org/reference/hooks/notify_moderator/) - Filters whether to send the site moderator email notifications, overriding the site setting.
- [`notify_post_author`](https://developer.wordpress.org/reference/hooks/notify_post_author/) - Filters whether to send the post author new comment and note notification emails, overriding the site settings and defaults. By default, notifications are sent for all notes and for approved comments.
- [`oembed_default_width`](https://developer.wordpress.org/reference/hooks/oembed_default_width/) - Filters the maxwidth oEmbed parameter.
- [`oembed_discovery_links`](https://developer.wordpress.org/reference/hooks/oembed_discovery_links/) - Filters the oEmbed discovery links HTML.
- [`oembed_endpoint_url`](https://developer.wordpress.org/reference/hooks/oembed_endpoint_url/) - Filters the oEmbed endpoint URL.
- [`oembed_min_max_width`](https://developer.wordpress.org/reference/hooks/oembed_min_max_width/) - Filters the allowed minimum and maximum widths for the oEmbed response.
- [`oembed_request_post_id`](https://developer.wordpress.org/reference/hooks/oembed_request_post_id/) - Filters the determined post ID.
- [`oembed_response_data`](https://developer.wordpress.org/reference/hooks/oembed_response_data/) - Filters the oEmbed response data.
- [`old_slug_redirect_url`](https://developer.wordpress.org/reference/hooks/old_slug_redirect_url/) - Filters the old slug redirect URL.
- [`post_edit_category_parent_dropdown_args`](https://developer.wordpress.org/reference/hooks/post_edit_category_parent_dropdown_args/) - Filters the arguments for the taxonomy parent dropdown on the Post Edit page.
- [`post_embed_url`](https://developer.wordpress.org/reference/hooks/post_embed_url/) - Filters the URL to embed a specific post.
- [`postmeta_form_keys`](https://developer.wordpress.org/reference/hooks/postmeta_form_keys/) - Filters values for the meta key dropdown in the Custom Fields meta box.
- [`pre_delete_post`](https://developer.wordpress.org/reference/hooks/pre_delete_post/) - Filters whether a post deletion should take place.
- [`pre_get_document_title`](https://developer.wordpress.org/reference/hooks/pre_get_document_title/) - Filters the document title before it is generated.
- [`pre_get_lastpostmodified`](https://developer.wordpress.org/reference/hooks/pre_get_lastpostmodified/) - Pre-filter the return value of get_lastpostmodified() before the query is run.
- [`register_post_type_args`](https://developer.wordpress.org/reference/hooks/register_post_type_args/) - Filters the arguments for registering a post type.
- [`register_taxonomy_args`](https://developer.wordpress.org/reference/hooks/register_taxonomy_args/) - Filters the arguments for registering a taxonomy.
- [`respond_link`](https://developer.wordpress.org/reference/hooks/respond_link/) - Filters the respond link when a post has no comments.
- [`rest_authentication_errors`](https://developer.wordpress.org/reference/hooks/rest_authentication_errors/) - Filters REST API authentication errors.
- [`rest_avatar_sizes`](https://developer.wordpress.org/reference/hooks/rest_avatar_sizes/) - Filters the REST avatar sizes.
- [`rest_dispatch_request`](https://developer.wordpress.org/reference/hooks/rest_dispatch_request/) - Filters the REST API dispatch request result.
- [`rest_endpoints`](https://developer.wordpress.org/reference/hooks/rest_endpoints/) - Filters the array of available REST API endpoints.
- [`rest_endpoints_description`](https://developer.wordpress.org/reference/hooks/rest_endpoints_description/) - Filters the publicly-visible data for a single REST API route.
- [`rest_envelope_response`](https://developer.wordpress.org/reference/hooks/rest_envelope_response/) - Filters the enveloped form of a REST API response.
- [`rest_index`](https://developer.wordpress.org/reference/hooks/rest_index/) - Filters the REST API root index data.
- [`rest_jsonp_enabled`](https://developer.wordpress.org/reference/hooks/rest_jsonp_enabled/) - Filters whether JSONP is enabled for the REST API.
- [`rest_namespace_index`](https://developer.wordpress.org/reference/hooks/rest_namespace_index/) - Filters the REST API namespace index data.
- [`rest_post_dispatch`](https://developer.wordpress.org/reference/hooks/rest_post_dispatch/) - Filters the REST API response.
- [`rest_pre_dispatch`](https://developer.wordpress.org/reference/hooks/rest_pre_dispatch/) - Filters the pre-calculated result of a REST API dispatch request.
- [`rest_pre_serve_request`](https://developer.wordpress.org/reference/hooks/rest_pre_serve_request/) - Filters whether the REST API request has already been served.
- [`rest_request_parameter_order`](https://developer.wordpress.org/reference/hooks/rest_request_parameter_order/) - Filters the parameter priority order for a REST API request.
- [`rest_route_data`](https://developer.wordpress.org/reference/hooks/rest_route_data/) - Filters the publicly-visible data for REST API routes.
- [`rest_send_nocache_headers`](https://developer.wordpress.org/reference/hooks/rest_send_nocache_headers/) - Filters whether to send no-cache headers on a REST API request.
- [`rest_url`](https://developer.wordpress.org/reference/hooks/rest_url/) - Filters the REST URL.
- [`rest_url_prefix`](https://developer.wordpress.org/reference/hooks/rest_url_prefix/) - Filters the REST URL prefix.
- [`screen_options_show_submit`](https://developer.wordpress.org/reference/hooks/screen_options_show_submit/) - Filters whether to show the Screen Options submit button.
- [`show_network_active_plugins`](https://developer.wordpress.org/reference/hooks/show_network_active_plugins/) - Filters whether to display network-active plugins alongside plugins active for the current site.
- [`signup_get_available_languages`](https://developer.wordpress.org/reference/hooks/signup_get_available_languages/) - Filters the list of available languages for front-end site sign-ups.
- [`submenu_file`](https://developer.wordpress.org/reference/hooks/submenu_file/) - Filters the file of an admin menu sub-menu item.
- [`taxonomy_labels_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/taxonomy_labels_taxonomy/) - Filters the labels of a specific taxonomy.
- [`the_category_list`](https://developer.wordpress.org/reference/hooks/the_category_list/) - Filters the categories before building the category list.
- [`the_excerpt_embed`](https://developer.wordpress.org/reference/hooks/the_excerpt_embed/) - Filters the post excerpt for the embed template.
- [`update_right_now_text`](https://developer.wordpress.org/reference/hooks/update_right_now_text/) - Filters the text displayed in the 'At a Glance' dashboard widget.
- [`user_profile_picture_description`](https://developer.wordpress.org/reference/hooks/user_profile_picture_description/) - Filters the user profile picture description displayed under the Gravatar.
- [`users_list_table_query_args`](https://developer.wordpress.org/reference/hooks/users_list_table_query_args/) - Filters the query arguments used to retrieve users for the current users list table.
- [`view_mode_post_types`](https://developer.wordpress.org/reference/hooks/view_mode_post_types/) - Filters the post types that have different view mode options.
- [`wp_calculate_image_sizes`](https://developer.wordpress.org/reference/hooks/wp_calculate_image_sizes/) - Filters the output of wp_calculate_image_sizes().
- [`wp_calculate_image_srcset`](https://developer.wordpress.org/reference/hooks/wp_calculate_image_srcset/) - Filters an image's 'srcset' sources.
- [`wp_dropdown_users_args`](https://developer.wordpress.org/reference/hooks/wp_dropdown_users_args/) - Filters the query arguments for the list of users in the dropdown.
- [`wp_http_ixr_client_headers`](https://developer.wordpress.org/reference/hooks/wp_http_ixr_client_headers/) - Filters the headers collection to be sent to the XML-RPC server.
- [`wp_post_revision_title_expanded`](https://developer.wordpress.org/reference/hooks/wp_post_revision_title_expanded/) - Filters the formatted author and date for a revision.
- [`wp_prepare_revision_for_js`](https://developer.wordpress.org/reference/hooks/wp_prepare_revision_for_js/) - Filters the array of revisions used on the revisions screen.
- [`wp_rest_server_class`](https://developer.wordpress.org/reference/hooks/wp_rest_server_class/) - Filters the REST Server Class.
- [`wp_theme_editor_filetypes`](https://developer.wordpress.org/reference/hooks/wp_theme_editor_filetypes/) - Filters the list of file types allowed for editing in the theme file editor.
- [`xmlrpc_chunk_parsing_size`](https://developer.wordpress.org/reference/hooks/xmlrpc_chunk_parsing_size/) - Filters the chunk size that can be used to parse an XML-RPC response message.

### Changes

- [`default_option_{$option}`](https://developer.wordpress.org/reference/hooks/default_option_option/) - The <code>$option</code> parameter was added.
- [`default_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/default_site_option_option/) - The <code>$option</code> parameter was added.
- [`do_feed_{$feed}`](https://developer.wordpress.org/reference/hooks/do_feed_feed/) - The <code>$feed</code> parameter was added.
- [`editable_slug`](https://developer.wordpress.org/reference/hooks/editable_slug/) - The <code>$tag</code> parameter was added.
- [`embed_oembed_discover`](https://developer.wordpress.org/reference/hooks/embed_oembed_discover/) - The default value changed to true.
- [`get_{$adjacent}_post_join`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_join/) - Added the <code>$taxonomy</code> and <code>$post</code> parameters.
- [`get_{$adjacent}_post_sort`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_sort/) - Added the <code>$post</code> parameter.
- [`get_{$adjacent}_post_where`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_where/) - Added the <code>$taxonomy</code> and <code>$post</code> parameters.
- [`get_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/get_taxonomy/) - <code>$_term</code> is now a WP_Term object.
- [`get_comment_link`](https://developer.wordpress.org/reference/hooks/get_comment_link/) - Added the <code>$cpage</code> parameter.
- [`get_sample_permalink_html`](https://developer.wordpress.org/reference/hooks/get_sample_permalink_html/) - Added <code>$post</code> parameter.
- [`get_term`](https://developer.wordpress.org/reference/hooks/get_term/) - <code>$_term</code> is now a WP_Term object.
- [`get_the_categories`](https://developer.wordpress.org/reference/hooks/get_the_categories/) - Added the <code>$post_id</code> parameter.
- [`get_wp_title_rss`](https://developer.wordpress.org/reference/hooks/get_wp_title_rss/) - The <code>$sep</code> parameter was deprecated and renamed to <code>$deprecated</code>.
- [`hidden_columns`](https://developer.wordpress.org/reference/hooks/hidden_columns/) (4.4.1) - Added the <code>use_defaults</code> parameter.
- [`intermediate_image_sizes_advanced`](https://developer.wordpress.org/reference/hooks/intermediate_image_sizes_advanced/) - Added the <code>$image_meta</code> argument.
- [`lostpassword_post`](https://developer.wordpress.org/reference/hooks/lostpassword_post/) - Added the <code>$errors</code> parameter.
- [`option_{$option}`](https://developer.wordpress.org/reference/hooks/option_option/) - The <code>$option</code> parameter was added.
- [`post_submitbox_misc_actions`](https://developer.wordpress.org/reference/hooks/post_submitbox_misc_actions/) - Added the <code>$post</code> parameter.
- [`pre_add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_add_site_option_option/) - The <code>$option</code> parameter was added.
- [`pre_delete_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_delete_site_option_option/) - The <code>$option</code> parameter was added.
- [`pre_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_option_option/) - The <code>$option</code> parameter was added.
- [`pre_set_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_set_site_transient_transient/) - The <code>$transient</code> parameter was added.
- [`pre_set_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_set_transient_transient/) - The <code>$transient</code> parameter was added.
- [`pre_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_site_option_option/) - The <code>$option</code> parameter was added.
- [`pre_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_site_transient_transient/) - The <code>$transient</code> parameter was added.
- [`pre_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_transient_transient/) - The <code>$transient</code> parameter was added
- [`pre_update_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_update_option_option/) - The <code>$option</code> parameter was added.
- [`pre_update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_update_site_option_option/) - The <code>$option</code> parameter was added.
- [`restrict_manage_posts`](https://developer.wordpress.org/reference/hooks/restrict_manage_posts/) - The <code>$post_type</code> parameter was added.
- [`retrieve_password_title`](https://developer.wordpress.org/reference/hooks/retrieve_password_title/) - Added the <code>$user_login</code> and <code>$user_data</code> parameters.
- [`set_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/set_site_transient_transient/) - The <code>$transient</code> parameter was added
- [`set_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/set_transient_transient/) - The <code>$transient</code> parameter was added.
- [`shortcode_atts_{$shortcode}`](https://developer.wordpress.org/reference/hooks/shortcode_atts_shortcode/) - Added the <code>$shortcode</code> parameter.
- [`show_password_fields`](https://developer.wordpress.org/reference/hooks/show_password_fields/) - Now evaluated only in user-edit.php.
- [`site_option_{$option}`](https://developer.wordpress.org/reference/hooks/site_option_option/) - The <code>$option</code> parameter was added.
- [`site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/site_transient_transient/) - The <code>$transient</code> parameter was added.
- [`subdirectory_reserved_names`](https://developer.wordpress.org/reference/hooks/subdirectory_reserved_names/) - 'wp-admin', 'wp-content', 'wp-includes', 'wp-json', and 'embed' were added to the reserved names list.
- [`the_permalink`](https://developer.wordpress.org/reference/hooks/the_permalink/) - Added the <code>$post</code> parameter.
- [`theme_{$post_type}_templates`](https://developer.wordpress.org/reference/hooks/theme_post_type_templates/) - Converted to allow complete control over the <code>$page_templates</code> array.
- [`transient_{$transient}`](https://developer.wordpress.org/reference/hooks/transient_transient/) - The <code>$transient</code> parameter was added
- [`update_option_{$option}`](https://developer.wordpress.org/reference/hooks/update_option_option/) - The <code>$option</code> parameter was added.
- [`upgrader_source_selection`](https://developer.wordpress.org/reference/hooks/upgrader_source_selection/) - The <code>$hook_extra</code> parameter became available.
- [`widget_links_args`](https://developer.wordpress.org/reference/hooks/widget_links_args/) - Added the <code>$instance</code> parameter.
- [`widget_nav_menu_args`](https://developer.wordpress.org/reference/hooks/widget_nav_menu_args/) - Added the <code>$instance</code> parameter.
- [`widget_text`](https://developer.wordpress.org/reference/hooks/widget_text/) - Added the <code>$widget</code> parameter.
- [`wp_dropdown_pages`](https://developer.wordpress.org/reference/hooks/wp_dropdown_pages/) - <code>$parsed_args</code> and <code>$pages</code> added as arguments.
- [`wp_list_pages`](https://developer.wordpress.org/reference/hooks/wp_list_pages/) - <code>$pages</code> added as arguments.
- [`wp_read_image_metadata`](https://developer.wordpress.org/reference/hooks/wp_read_image_metadata/) - The <code>$iptc</code> parameter was added.
- [`wp_title_rss`](https://developer.wordpress.org/reference/hooks/wp_title_rss/) - The <code>$sep</code> parameter was deprecated and renamed to <code>$deprecated</code>.
- [`wpmu_update_blog_options`](https://developer.wordpress.org/reference/hooks/wpmu_update_blog_options/) - Added <code>$id</code> parameter.

## WordPress 4.3

### New Actions

- [`add_user_role`](https://developer.wordpress.org/reference/hooks/add_user_role/) - Fires immediately after the user has been given a new role.
- [`deprecated_constructor_run`](https://developer.wordpress.org/reference/hooks/deprecated_constructor_run/) - Fires when a deprecated constructor is called.
- [`remove_user_role`](https://developer.wordpress.org/reference/hooks/remove_user_role/) - Fires immediately after a role as been removed from a user.
- [`wp_ajax_crop_image_pre_save`](https://developer.wordpress.org/reference/hooks/wp_ajax_crop_image_pre_save/) - Fires before a cropped image is saved.

### New Filters

- [`customize_nav_menu_available_item_types`](https://developer.wordpress.org/reference/hooks/customize_nav_menu_available_item_types/) - Filters the available menu item types.
- [`customize_nav_menu_available_items`](https://developer.wordpress.org/reference/hooks/customize_nav_menu_available_items/) - Filters the available menu items.
- [`deprecated_constructor_trigger_error`](https://developer.wordpress.org/reference/hooks/deprecated_constructor_trigger_error/) - Filters whether to trigger an error for deprecated functions.
- [`edit_comment_misc_actions`](https://developer.wordpress.org/reference/hooks/edit_comment_misc_actions/) - Filters miscellaneous actions for the edit comment form sidebar.
- [`editor_stylesheets`](https://developer.wordpress.org/reference/hooks/editor_stylesheets/) - Filters the array of URLs of stylesheets applied to the editor.
- [`email_change_email`](https://developer.wordpress.org/reference/hooks/email_change_email/) - Filters the contents of the email sent when the user's email is changed.
- [`format_for_editor`](https://developer.wordpress.org/reference/hooks/format_for_editor/) - Filters the text after it is formatted for the editor.
- [`get_default_comment_status`](https://developer.wordpress.org/reference/hooks/get_default_comment_status/) - Filters the default comment status for the given post type.
- [`get_main_network_id`](https://developer.wordpress.org/reference/hooks/get_main_network_id/) - Filters the main network ID.
- [`has_nav_menu`](https://developer.wordpress.org/reference/hooks/has_nav_menu/) - Filters whether a nav menu is assigned to the specified location.
- [`list_table_primary_column`](https://developer.wordpress.org/reference/hooks/list_table_primary_column/) - Filters the name of the primary column for the current list table.
- [`nav_menu_items_{$post_type_name}_recent`](https://developer.wordpress.org/reference/hooks/nav_menu_items_post_type_name_recent/) - Filters the posts displayed in the 'Most Recent' tab of the current post type's menu items meta box.
- [`password_change_email`](https://developer.wordpress.org/reference/hooks/password_change_email/) - Filters the contents of the email sent when the user's password is changed.
- [`password_reset_expiration`](https://developer.wordpress.org/reference/hooks/password_reset_expiration/) - Filters the expiration time of password reset keys.
- [`send_email_change_email`](https://developer.wordpress.org/reference/hooks/send_email_change_email/) - Filters whether to send the email change email.
- [`send_password_change_email`](https://developer.wordpress.org/reference/hooks/send_password_change_email/) - Filters whether to send the password change email.
- [`site_icon_attachment_metadata`](https://developer.wordpress.org/reference/hooks/site_icon_attachment_metadata/) - Filters the site icon attachment metadata.
- [`site_icon_image_sizes`](https://developer.wordpress.org/reference/hooks/site_icon_image_sizes/) - Filters the different dimensions that a site icon is saved in.
- [`site_icon_meta_tags`](https://developer.wordpress.org/reference/hooks/site_icon_meta_tags/) - Filters the site icon meta tags, so plugins can add their own.
- [`upgrader_package_options`](https://developer.wordpress.org/reference/hooks/upgrader_package_options/) - Filters the package options before running an update.
- [`wp_ajax_cropped_attachment_id`](https://developer.wordpress.org/reference/hooks/wp_ajax_cropped_attachment_id/) - Filters the attachment ID for a cropped image.
- [`wp_ajax_cropped_attachment_metadata`](https://developer.wordpress.org/reference/hooks/wp_ajax_cropped_attachment_metadata/) - Filters the cropped image attachment metadata.
- [`wp_generate_tag_cloud_data`](https://developer.wordpress.org/reference/hooks/wp_generate_tag_cloud_data/) - Filters the data used to generate the tag cloud.
- [`wp_get_attachment_image_src`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_image_src/) - Filters the attachment image source result.
- [`wp_get_nav_menu_object`](https://developer.wordpress.org/reference/hooks/wp_get_nav_menu_object/) - Filters the nav_menu term retrieved for wp_get_nav_menu_object().
- [`wp_refresh_nonces`](https://developer.wordpress.org/reference/hooks/wp_refresh_nonces/) - Filters the nonces to send to the New/Edit Post screen.
- [`wp_safe_redirect_fallback`](https://developer.wordpress.org/reference/hooks/wp_safe_redirect_fallback/) - Filters the redirect fallback URL for when the provided redirect is not safe (local).
- [`wp_should_upgrade_global_tables`](https://developer.wordpress.org/reference/hooks/wp_should_upgrade_global_tables/) - Filters if upgrade routines should be run on global tables.
- [`wp_unique_term_slug`](https://developer.wordpress.org/reference/hooks/wp_unique_term_slug/) - Filters the unique term slug.
- [`wp_unique_term_slug_is_bad_slug`](https://developer.wordpress.org/reference/hooks/wp_unique_term_slug_is_bad_slug/) - Filters whether the proposed unique term slug is bad.

### Changes

- [`get_the_author_{$field}`](https://developer.wordpress.org/reference/hooks/get_the_author_field/) - The <code>$original_user_id</code> parameter was added.
- [`get_usernumposts`](https://developer.wordpress.org/reference/hooks/get_usernumposts/) (4.3.1) - Added <code>$public_only</code> argument.
- [`language_attributes`](https://developer.wordpress.org/reference/hooks/language_attributes/) - Added the <code>$doctype</code> parameter.
- [`password_reset_key_expired`](https://developer.wordpress.org/reference/hooks/password_reset_key_expired/) - Previously key hashes were stored without an expiration time.
- [`sanitize_option_{$option}`](https://developer.wordpress.org/reference/hooks/sanitize_option_option/) - Added the <code>$original_value</code> parameter.
- [`style_loader_tag`](https://developer.wordpress.org/reference/hooks/style_loader_tag/) - Introduced the <code>$href</code> parameter.

## WordPress 4.2

### New Actions

- [`parse_comment_query`](https://developer.wordpress.org/reference/hooks/parse_comment_query/) - Fires after the comment query vars have been parsed.
- [`split_shared_term`](https://developer.wordpress.org/reference/hooks/split_shared_term/) - Fires after a previously shared taxonomy term is split into two separate terms.

### New Filters

- [`attachment_url_to_postid`](https://developer.wordpress.org/reference/hooks/attachment_url_to_postid/) - Filters an attachment ID found by URL.
- [`category_css_class`](https://developer.wordpress.org/reference/hooks/category_css_class/) - Filters the list of CSS classes to include with each category in the list.
- [`comment_form_submit_button`](https://developer.wordpress.org/reference/hooks/comment_form_submit_button/) - Filters the submit button for the comment form to display.
- [`comment_form_submit_field`](https://developer.wordpress.org/reference/hooks/comment_form_submit_field/) - Filters the submit field for the comment form to display.
- [`customize_dynamic_setting_args`](https://developer.wordpress.org/reference/hooks/customize_dynamic_setting_args/) - Filters a dynamic setting's constructor args.
- [`customize_dynamic_setting_class`](https://developer.wordpress.org/reference/hooks/customize_dynamic_setting_class/) - Allow non-statically created settings to be constructed with custom WP_Customize_Setting subclass.
- [`customize_refresh_nonces`](https://developer.wordpress.org/reference/hooks/customize_refresh_nonces/) - Filters nonces for Customizer.
- [`customize_save_response`](https://developer.wordpress.org/reference/hooks/customize_save_response/) - Filters response data for a successful customize_save Ajax request.
- [`dashboard_recent_posts_query_args`](https://developer.wordpress.org/reference/hooks/dashboard_recent_posts_query_args/) - Filters the query arguments used for the Recent Posts widget.
- [`disable_months_dropdown`](https://developer.wordpress.org/reference/hooks/disable_months_dropdown/) - Filters whether to remove the 'Months' drop-down from the post list table.
- [`emoji_ext`](https://developer.wordpress.org/reference/hooks/emoji_ext/) - Filters the extension of the emoji png files.
- [`emoji_url`](https://developer.wordpress.org/reference/hooks/emoji_url/) - Filters the URL where emoji png images are hosted.
- [`get_avatar_data`](https://developer.wordpress.org/reference/hooks/get_avatar_data/) - Filters the avatar data.
- [`get_avatar_url`](https://developer.wordpress.org/reference/hooks/get_avatar_url/) - Filters the avatar URL.
- [`get_object_terms`](https://developer.wordpress.org/reference/hooks/get_object_terms/) - Filters the terms for a given object or objects.
- [`logout_redirect`](https://developer.wordpress.org/reference/hooks/logout_redirect/) - Filters the log out redirect URL.
- [`media_embedded_in_content_allowed_types`](https://developer.wordpress.org/reference/hooks/media_embedded_in_content_allowed_types/) - Filters the embedded media types that are allowed to be returned from the content blob.
- [`pre_get_avatar`](https://developer.wordpress.org/reference/hooks/pre_get_avatar/) - Allows the HTML for a user's avatar to be returned early.
- [`pre_get_avatar_data`](https://developer.wordpress.org/reference/hooks/pre_get_avatar_data/) - Filters whether to retrieve the avatar URL early.
- [`pre_get_col_charset`](https://developer.wordpress.org/reference/hooks/pre_get_col_charset/) - Filters the column charset value before the DB is checked.
- [`pre_get_table_charset`](https://developer.wordpress.org/reference/hooks/pre_get_table_charset/) - Filters the table charset value before the DB is checked.
- [`pre_prepare_themes_for_js`](https://developer.wordpress.org/reference/hooks/pre_prepare_themes_for_js/) - Filters theme data before it is prepared for JavaScript.
- [`quick_edit_show_taxonomy`](https://developer.wordpress.org/reference/hooks/quick_edit_show_taxonomy/) - Filters whether the current taxonomy should be shown in the Quick Edit panel.
- [`removable_query_args`](https://developer.wordpress.org/reference/hooks/removable_query_args/) - Filters the list of query variable names to remove.
- [`the_guid`](https://developer.wordpress.org/reference/hooks/the_guid/) - Filters the escaped Global Unique Identifier (guid) of the post.
- [`widget_nav_menu_args`](https://developer.wordpress.org/reference/hooks/widget_nav_menu_args/) - Filters the arguments for the Navigation Menu widget.

### Changes

- [`{$adjacent}_post_link`](https://developer.wordpress.org/reference/hooks/adjacent_post_link/) - Added the <code>$adjacent</code> parameter.
- [`get_avatar`](https://developer.wordpress.org/reference/hooks/get_avatar/) - Added the <code>$args</code> parameter.
- [`login_url`](https://developer.wordpress.org/reference/hooks/login_url/) - The <code>$force_reauth</code> parameter was added.
- [`post_gallery`](https://developer.wordpress.org/reference/hooks/post_gallery/) - The <code>$instance</code> parameter was added.
- [`post_playlist`](https://developer.wordpress.org/reference/hooks/post_playlist/) - The <code>$instance</code> parameter was added.
- [`pre_set_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_set_transient_transient/) - The <code>$expiration</code> parameter was added.
- [`taxonomy_parent_dropdown_args`](https://developer.wordpress.org/reference/hooks/taxonomy_parent_dropdown_args/) - Added <code>$context</code> parameter.

## WordPress 4.1

### New Actions

- [`customize_preview_{$this->type}`](https://developer.wordpress.org/reference/hooks/customize_preview_this-type/) - Fires when the WP_Customize_Setting::preview() method is called for settings not handled as theme_mods or options.
- [`edit_form_before_permalink`](https://developer.wordpress.org/reference/hooks/edit_form_before_permalink/) - Fires before the permalink field in the edit form.
- [`pre_delete_term`](https://developer.wordpress.org/reference/hooks/pre_delete_term/) - Fires when deleting a term, before any modifications are made to posts or terms.
- [`wp_creating_autosave`](https://developer.wordpress.org/reference/hooks/wp_creating_autosave/) - Fires before an autosave is stored.

### New Filters

- [`comment_reply_link_args`](https://developer.wordpress.org/reference/hooks/comment_reply_link_args/) - Filters the comment reply link arguments.
- [`customize_panel_active`](https://developer.wordpress.org/reference/hooks/customize_panel_active/) - Filters response of WP_Customize_Panel::active().
- [`customize_section_active`](https://developer.wordpress.org/reference/hooks/customize_section_active/) - Filters response of WP_Customize_Section::active().
- [`default_page_template_title`](https://developer.wordpress.org/reference/hooks/default_page_template_title/) - Filters the title of the default page template displayed in the drop-down.
- [`get_the_archive_description`](https://developer.wordpress.org/reference/hooks/get_the_archive_description/) - Filters the archive description.
- [`get_the_archive_title`](https://developer.wordpress.org/reference/hooks/get_the_archive_title/) - Filters the archive title.
- [`image_add_caption_text`](https://developer.wordpress.org/reference/hooks/image_add_caption_text/) - Filters the caption text.
- [`meta_query_find_compatible_table_alias`](https://developer.wordpress.org/reference/hooks/meta_query_find_compatible_table_alias/) - Filters the table alias identified as compatible with the current clause.
- [`password_hint`](https://developer.wordpress.org/reference/hooks/password_hint/) - Filters the text describing the site's password complexity policy.
- [`process_text_diff_html`](https://developer.wordpress.org/reference/hooks/process_text_diff_html/) - Contextually filters a diffed line.
- [`revision_text_diff_options`](https://developer.wordpress.org/reference/hooks/revision_text_diff_options/) - Filters revisions text diff options.
- [`script_loader_tag`](https://developer.wordpress.org/reference/hooks/script_loader_tag/) - Filters the HTML script tag of an enqueued script.
- [`wp_constrain_dimensions`](https://developer.wordpress.org/reference/hooks/wp_constrain_dimensions/) - Filters dimensions to constrain down-sampled images to.
- [`wp_get_revision_ui_diff`](https://developer.wordpress.org/reference/hooks/wp_get_revision_ui_diff/) - Filters the fields displayed in the post revision diff UI.
- [`wp_save_post_revision_post_has_changed`](https://developer.wordpress.org/reference/hooks/wp_save_post_revision_post_has_changed/) - Filters whether a post has changed.

### Changes

- [`author_email`](https://developer.wordpress.org/reference/hooks/author_email/) - The <code>$comment_id</code> parameter was added.
- [`comment_author`](https://developer.wordpress.org/reference/hooks/comment_author/) - The <code>$comment_id</code> parameter was added.
- [`comment_email`](https://developer.wordpress.org/reference/hooks/comment_email/) - The <code>$comment</code> parameter was added.
- [`comment_excerpt`](https://developer.wordpress.org/reference/hooks/comment_excerpt/) - The <code>$comment_id</code> parameter was added.
- [`comment_url`](https://developer.wordpress.org/reference/hooks/comment_url/) - The <code>$comment_id</code> parameter was added.
- [`date_query_valid_columns`](https://developer.wordpress.org/reference/hooks/date_query_valid_columns/) - Added 'user_registered' to the default recognized columns.
- [`get_ancestors`](https://developer.wordpress.org/reference/hooks/get_ancestors/) (4.1.1) - Introduced the <code>$resource_type</code> parameter.
- [`get_comment_author_email`](https://developer.wordpress.org/reference/hooks/get_comment_author_email/) - The <code>$comment_id</code> and <code>$comment</code> parameters were added.
- [`get_comment_author_IP`](https://developer.wordpress.org/reference/hooks/get_comment_author_IP/) - The <code>$comment_id</code> and <code>$comment</code> parameters were added.
- [`get_comment_author_link`](https://developer.wordpress.org/reference/hooks/get_comment_author_link/) - The <code>$comment_author</code> and <code>$comment_id</code> parameters were added.
- [`get_comment_author_url`](https://developer.wordpress.org/reference/hooks/get_comment_author_url/) - The <code>$comment_id</code> and <code>$comment</code> parameters were added.
- [`get_comment_author`](https://developer.wordpress.org/reference/hooks/get_comment_author/) - The <code>$comment_id</code> and <code>$comment</code> parameters were added.
- [`get_comment_excerpt`](https://developer.wordpress.org/reference/hooks/get_comment_excerpt/) - The <code>$comment_id</code> and <code>$comment</code> parameters were added.
- [`get_comment_ID`](https://developer.wordpress.org/reference/hooks/get_comment_ID/) - The <code>$comment</code> parameter was added.
- [`get_comment_type`](https://developer.wordpress.org/reference/hooks/get_comment_type/) - The <code>$comment_id</code> and <code>$comment</code> parameters were added.
- [`get_usernumposts`](https://developer.wordpress.org/reference/hooks/get_usernumposts/) - Added <code>$post_type</code> argument.
- [`nav_menu_css_class`](https://developer.wordpress.org/reference/hooks/nav_menu_css_class/) - The <code>$depth</code> parameter was added.
- [`nav_menu_item_id`](https://developer.wordpress.org/reference/hooks/nav_menu_item_id/) - The <code>$depth</code> parameter was added.
- [`nav_menu_link_attributes`](https://developer.wordpress.org/reference/hooks/nav_menu_link_attributes/) - The <code>$depth</code> parameter was added.
- [`retrieve_password_message`](https://developer.wordpress.org/reference/hooks/retrieve_password_message/) - Added <code>$user_login</code> and <code>$user_data</code> parameters.
- [`the_post`](https://developer.wordpress.org/reference/hooks/the_post/) - Introduced <code>$query</code> parameter.
- [`wp_editor_expand`](https://developer.wordpress.org/reference/hooks/wp_editor_expand/) - Added the <code>$post_type</code> parameter.

## WordPress 4.0

### New Actions

- [`auth_cookie_bad_session_token`](https://developer.wordpress.org/reference/hooks/auth_cookie_bad_session_token/) - Fires if a bad session token is encountered.
- [`customize_render_panel`](https://developer.wordpress.org/reference/hooks/customize_render_panel/) - Fires before rendering a Customizer panel.
- [`customize_render_panel_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_render_panel_this-id/) - Fires before rendering a specific Customizer panel.
- [`delete_user_form`](https://developer.wordpress.org/reference/hooks/delete_user_form/) - Fires at the end of the delete users form prior to the confirm button.
- [`pre_get_users`](https://developer.wordpress.org/reference/hooks/pre_get_users/) - Fires before the WP_User_Query has been parsed.
- [`rss_tag_pre`](https://developer.wordpress.org/reference/hooks/rss_tag_pre/) - Fires between the xml and rss tags in a feed.

### New Filters

- [`async_update_translation`](https://developer.wordpress.org/reference/hooks/async_update_translation/) - Filters whether to asynchronously update translation for core, a plugin, or a theme.
- [`attach_session_information`](https://developer.wordpress.org/reference/hooks/attach_session_information/) - Filters the information attached to the newly created session.
- [`customize_control_active`](https://developer.wordpress.org/reference/hooks/customize_control_active/) - Filters response of WP_Customize_Control::active().
- [`human_time_diff`](https://developer.wordpress.org/reference/hooks/human_time_diff/) - Filters the human-readable difference between two timestamps.
- [`oembed_remote_get_args`](https://developer.wordpress.org/reference/hooks/oembed_remote_get_args/) - Filters oEmbed remote get arguments.
- [`oembed_ttl`](https://developer.wordpress.org/reference/hooks/oembed_ttl/) - Filters the oEmbed TTL value (time to live).
- [`run_wptexturize`](https://developer.wordpress.org/reference/hooks/run_wptexturize/) - Filters whether to skip running wptexturize().
- [`session_token_manager`](https://developer.wordpress.org/reference/hooks/session_token_manager/) - Filters the class name for the session token manager.
- [`term_search_min_chars`](https://developer.wordpress.org/reference/hooks/term_search_min_chars/) - Filters the minimum number of characters required to fire a tag search via Ajax.
- [`translations_api`](https://developer.wordpress.org/reference/hooks/translations_api/) - Allows a plugin to override the WordPress.org Translation Installation API entirely.
- [`translations_api_result`](https://developer.wordpress.org/reference/hooks/translations_api_result/) - Filters the Translation Installation API response results.
- [`wp_editor_expand`](https://developer.wordpress.org/reference/hooks/wp_editor_expand/) - Filters whether to enable the 'expand' functionality in the post editor.
- [`wp_editor_settings`](https://developer.wordpress.org/reference/hooks/wp_editor_settings/) - Filters the wp_editor() settings.
- [`wp_embed_handler_youtube`](https://developer.wordpress.org/reference/hooks/wp_embed_handler_youtube/) - Filters the YouTube embed output.
- [`wp_list_comments_args`](https://developer.wordpress.org/reference/hooks/wp_list_comments_args/) - Filters the arguments used in retrieving the comment list.
- [`wp_spaces_regexp`](https://developer.wordpress.org/reference/hooks/wp_spaces_regexp/) - Filters the regexp for common whitespace characters.
- [`wp_title_parts`](https://developer.wordpress.org/reference/hooks/wp_title_parts/) - Filters the parts of the page title.
- [`wxr_export_skip_commentmeta`](https://developer.wordpress.org/reference/hooks/wxr_export_skip_commentmeta/) - Filters whether to selectively skip comment meta used for WXR exports.
- [`xmlrpc_element_limit`](https://developer.wordpress.org/reference/hooks/xmlrpc_element_limit/) - Filters the number of elements to parse in an XML-RPC response.

### Changes

- [`{$action}_prefilter`](https://developer.wordpress.org/reference/hooks/action_prefilter/) - Converted to a dynamic hook with <code>$action</code>.
- [`auth_cookie`](https://developer.wordpress.org/reference/hooks/auth_cookie/) - The <code>$token</code> parameter was added.
- [`date_formats`](https://developer.wordpress.org/reference/hooks/date_formats/) - Replaced the <code>Y/m/d</code> format with <code>Y-m-d</code> (ISO date standard YYYY-MM-DD).
- [`preview_post_link`](https://developer.wordpress.org/reference/hooks/preview_post_link/) - Added the <code>$post</code> parameter.

## WordPress 3.9

### New Actions

- [`dynamic_sidebar_after`](https://developer.wordpress.org/reference/hooks/dynamic_sidebar_after/) - Fires after widgets are rendered in a dynamic sidebar.
- [`dynamic_sidebar_before`](https://developer.wordpress.org/reference/hooks/dynamic_sidebar_before/) - Fires before widgets are rendered in a dynamic sidebar.
- [`ms_site_not_found`](https://developer.wordpress.org/reference/hooks/ms_site_not_found/) - Fires when a network can be determined but a site cannot.
- [`resetpass_form`](https://developer.wordpress.org/reference/hooks/resetpass_form/) - Fires following the 'Strength indicator' meter in the user password reset form.
- [`wp_enqueue_editor`](https://developer.wordpress.org/reference/hooks/wp_enqueue_editor/) - Fires when scripts and styles are enqueued for the editor.
- [`wp_install`](https://developer.wordpress.org/reference/hooks/wp_install/) - Fires after a site is fully installed.
- [`wp_maybe_auto_update`](https://developer.wordpress.org/reference/hooks/wp_maybe_auto_update/) - Fires during wp_cron, starting the auto-update process.
- [`wp_playlist_scripts`](https://developer.wordpress.org/reference/hooks/wp_playlist_scripts/) - Prints and enqueues playlist scripts, styles, and JavaScript templates.
- [`wp_tiny_mce_init`](https://developer.wordpress.org/reference/hooks/wp_tiny_mce_init/) - Fires after tinymce.js is loaded, but before any TinyMCE editor instances are created.
- [`wp_upgrade`](https://developer.wordpress.org/reference/hooks/wp_upgrade/) - Fires after a site is fully upgraded.

### New Filters

- [`attachment_thumbnail_args`](https://developer.wordpress.org/reference/hooks/attachment_thumbnail_args/) - Filters the parameters for the attachment thumbnail creation.
- [`customizer_widgets_section_args`](https://developer.wordpress.org/reference/hooks/customizer_widgets_section_args/) - Filters Customizer widget section arguments for a given sidebar.
- [`determine_current_user`](https://developer.wordpress.org/reference/hooks/determine_current_user/) - Filters the current user.
- [`dynamic_sidebar_has_widgets`](https://developer.wordpress.org/reference/hooks/dynamic_sidebar_has_widgets/) - Filters whether a sidebar has widgets.
- [`incompatible_sql_modes`](https://developer.wordpress.org/reference/hooks/incompatible_sql_modes/) - Filters the list of incompatible SQL modes to exclude.
- [`is_active_sidebar`](https://developer.wordpress.org/reference/hooks/is_active_sidebar/) - Filters whether a dynamic sidebar is considered "active".
- [`is_wide_widget_in_customizer`](https://developer.wordpress.org/reference/hooks/is_wide_widget_in_customizer/) - Filters whether the given widget is considered "wide".
- [`network_by_path_segments_count`](https://developer.wordpress.org/reference/hooks/network_by_path_segments_count/) - Filters the number of path segments to consider when searching for a site.
- [`post_playlist`](https://developer.wordpress.org/reference/hooks/post_playlist/) - Filters the playlist output.
- [`pre_get_network_by_path`](https://developer.wordpress.org/reference/hooks/pre_get_network_by_path/) - Determines a network by its domain and path.
- [`pre_get_site_by_path`](https://developer.wordpress.org/reference/hooks/pre_get_site_by_path/) - Determines a site by its domain and path.
- [`pre_set_theme_mod_{$name}`](https://developer.wordpress.org/reference/hooks/pre_set_theme_mod_name/) - Filters the theme modification, or 'theme_mod', value on save.
- [`pre_update_option`](https://developer.wordpress.org/reference/hooks/pre_update_option/) - Filters an option before its value is (maybe) serialized and updated.
- [`pre_wp_nav_menu`](https://developer.wordpress.org/reference/hooks/pre_wp_nav_menu/) - Filters whether to short-circuit the wp_nav_menu() output.
- [`site_by_path_segments_count`](https://developer.wordpress.org/reference/hooks/site_by_path_segments_count/) - Filters the number of path segments to consider when searching for a site.
- [`theme_{$post_type}_templates`](https://developer.wordpress.org/reference/hooks/theme_post_type_templates/) - Filters list of page templates for a theme.
- [`widget_customizer_setting_args`](https://developer.wordpress.org/reference/hooks/widget_customizer_setting_args/) - Filters the common arguments supplied when constructing a Customizer setting.
- [`wp_get_attachment_id3_keys`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_id3_keys/) - Filters the editable list of keys to look up data from an attachment's metadata.
- [`wp_header_image_attachment_metadata`](https://developer.wordpress.org/reference/hooks/wp_header_image_attachment_metadata/) - Filters the header image attachment metadata.
- [`wp_insert_attachment_data`](https://developer.wordpress.org/reference/hooks/wp_insert_attachment_data/) - Filters attachment post data before it is updated in or added to the database.
- [`wp_mce_translation`](https://developer.wordpress.org/reference/hooks/wp_mce_translation/) - Filters translated strings prepared for TinyMCE.

### Changes

- [`use_default_gallery_style`](https://developer.wordpress.org/reference/hooks/use_default_gallery_style/) - Set the default to false when the theme supports HTML5 galleries.

## WordPress 3.8

### New Actions

- [`automatic_updates_complete`](https://developer.wordpress.org/reference/hooks/automatic_updates_complete/) - Fires after all automatic updates have run.

### New Filters

- [`automatic_updates_debug_email`](https://developer.wordpress.org/reference/hooks/automatic_updates_debug_email/) - Filters the debug email that can be sent following an automatic background core update.
- [`comment_notification_notify_author`](https://developer.wordpress.org/reference/hooks/comment_notification_notify_author/) - Filters whether to notify comment authors of their comments on their own posts.
- [`dashboard_glance_items`](https://developer.wordpress.org/reference/hooks/dashboard_glance_items/) - Filters the array of extra elements to list in the 'At a Glance' dashboard widget.
- [`wp_prepare_themes_for_js`](https://developer.wordpress.org/reference/hooks/wp_prepare_themes_for_js/) - Filters the themes prepared for JavaScript, for themes.php.

### Changes

- [`admin_color_scheme_picker`](https://developer.wordpress.org/reference/hooks/admin_color_scheme_picker/) (3.8.1) - Added <code>$user_id</code> parameter.

## WordPress 3.7

### New Actions

- [`edit_form_top`](https://developer.wordpress.org/reference/hooks/edit_form_top/) - Fires at the beginning of the edit form.
- [`parse_tax_query`](https://developer.wordpress.org/reference/hooks/parse_tax_query/) - Fires after taxonomy-related query vars have been parsed.
- [`save_post_{$post->post_type}`](https://developer.wordpress.org/reference/hooks/save_post_post-post_type/) - Fires once a post has been saved.
- [`user_new_form`](https://developer.wordpress.org/reference/hooks/user_new_form/) - Fires at the end of the new user form.
- [`{$taxonomy}_term_edit_form_tag`](https://developer.wordpress.org/reference/hooks/taxonomy_term_edit_form_tag/) - Fires inside the Edit Term form tag.
- [`{$taxonomy}_term_new_form_tag`](https://developer.wordpress.org/reference/hooks/taxonomy_term_new_form_tag/) - Fires inside the Add Tag form tag.

### New Filters

- [`ajax_query_attachments_args`](https://developer.wordpress.org/reference/hooks/ajax_query_attachments_args/) - Filters the arguments passed to WP_Query during an Ajax call for querying attachments.
- [`allow_dev_auto_core_updates`](https://developer.wordpress.org/reference/hooks/allow_dev_auto_core_updates/) - Filters whether to enable automatic core updates for development versions.
- [`allow_major_auto_core_updates`](https://developer.wordpress.org/reference/hooks/allow_major_auto_core_updates/) - Filters whether to enable major automatic core updates.
- [`allow_minor_auto_core_updates`](https://developer.wordpress.org/reference/hooks/allow_minor_auto_core_updates/) - Filters whether to enable minor automatic core updates.
- [`audio_submitbox_misc_sections`](https://developer.wordpress.org/reference/hooks/audio_submitbox_misc_sections/) - Filters the audio attachment metadata fields to be shown in the publish meta box.
- [`auto_core_update_email`](https://developer.wordpress.org/reference/hooks/auto_core_update_email/) - Filters the email sent following an automatic background core update.
- [`auto_core_update_send_email`](https://developer.wordpress.org/reference/hooks/auto_core_update_send_email/) - Filters whether to send an email following an automatic background core update.
- [`auto_update_{$type}`](https://developer.wordpress.org/reference/hooks/auto_update_type/) - Filters whether to automatically update core, a plugin, a theme, or a language.
- [`automatic_updater_disabled`](https://developer.wordpress.org/reference/hooks/automatic_updater_disabled/) - Filters whether to entirely disable background updates.
- [`automatic_updates_is_vcs_checkout`](https://developer.wordpress.org/reference/hooks/automatic_updates_is_vcs_checkout/) - Filters whether the automatic updater should consider a filesystem location to be potentially managed by a version control system.
- [`automatic_updates_send_debug_email`](https://developer.wordpress.org/reference/hooks/automatic_updates_send_debug_email/) - Filters whether to send a debugging email for each automatic background update.
- [`bulk_post_updated_messages`](https://developer.wordpress.org/reference/hooks/bulk_post_updated_messages/) - Filters the bulk action updated messages.
- [`check_is_user_spammed`](https://developer.wordpress.org/reference/hooks/check_is_user_spammed/) - Filters whether the user has been marked as a spammer.
- [`comment_moderation_recipients`](https://developer.wordpress.org/reference/hooks/comment_moderation_recipients/) - Filters the list of recipients for comment moderation emails.
- [`comment_notification_recipients`](https://developer.wordpress.org/reference/hooks/comment_notification_recipients/) - Filters the list of email addresses to receive a comment notification.
- [`date_query_valid_columns`](https://developer.wordpress.org/reference/hooks/date_query_valid_columns/) - Filters the list of valid date query columns.
- [`enable_live_network_counts`](https://developer.wordpress.org/reference/hooks/enable_live_network_counts/) - Filters whether to update network site or user counts when a new site is created.
- [`flush_rewrite_rules_hard`](https://developer.wordpress.org/reference/hooks/flush_rewrite_rules_hard/) - Filters whether a "hard" rewrite rule flush should be performed when requested.
- [`get_date_sql`](https://developer.wordpress.org/reference/hooks/get_date_sql/) - Filters the date query WHERE clause.
- [`get_space_allowed`](https://developer.wordpress.org/reference/hooks/get_space_allowed/) - Filters the upload quota for the current site.
- [`got_url_rewrite`](https://developer.wordpress.org/reference/hooks/got_url_rewrite/) - Filters whether URL rewriting is available.
- [`img_caption_shortcode_width`](https://developer.wordpress.org/reference/hooks/img_caption_shortcode_width/) - Filters the width of an image's caption.
- [`install_plugins_table_api_args_{$tab}`](https://developer.wordpress.org/reference/hooks/install_plugins_table_api_args_tab/) - Filters API request arguments for each Add Plugins screen tab.
- [`install_themes_table_api_args_{$tab}`](https://developer.wordpress.org/reference/hooks/install_themes_table_api_args_tab/) - Filters API request arguments for each Install Themes screen tab.
- [`media_submitbox_misc_sections`](https://developer.wordpress.org/reference/hooks/media_submitbox_misc_sections/) - Filters the audio and video metadata fields to be shown in the publish meta box.
- [`months_dropdown_results`](https://developer.wordpress.org/reference/hooks/months_dropdown_results/) - Filters the 'Months' drop-down results.
- [`password_reset_key_expired`](https://developer.wordpress.org/reference/hooks/password_reset_key_expired/) - Filters the return value of check_password_reset_key() when an old-style key or an expired key is used.
- [`plugins_update_check_locales`](https://developer.wordpress.org/reference/hooks/plugins_update_check_locales/) - Filters the locales requested for plugin translations.
- [`populate_network_meta`](https://developer.wordpress.org/reference/hooks/populate_network_meta/) - Filters meta for a network on creation.
- [`post_password_expires`](https://developer.wordpress.org/reference/hooks/post_password_expires/) - Filters the life span of the post password cookie.
- [`posts_search_orderby`](https://developer.wordpress.org/reference/hooks/posts_search_orderby/) - Filters the ORDER BY used when ordering search results.
- [`send_core_update_notification_email`](https://developer.wordpress.org/reference/hooks/send_core_update_notification_email/) - Filters whether to notify the site administrator of a new core update.
- [`taxonomy_parent_dropdown_args`](https://developer.wordpress.org/reference/hooks/taxonomy_parent_dropdown_args/) - Filters the taxonomy parent drop-down on the Edit Term page.
- [`term_updated_messages`](https://developer.wordpress.org/reference/hooks/term_updated_messages/) - Filters the messages displayed when a tag is updated.
- [`themes_update_check_locales`](https://developer.wordpress.org/reference/hooks/themes_update_check_locales/) - Filters the locales requested for theme translations.
- [`update_translations_complete_actions`](https://developer.wordpress.org/reference/hooks/update_translations_complete_actions/) - Filters the list of action links available following a translations update.
- [`upgrader_pre_download`](https://developer.wordpress.org/reference/hooks/upgrader_pre_download/) - Filters whether to download a package for a WordPress core, plugin, theme, or translation upgrade.
- [`wp_count_attachments`](https://developer.wordpress.org/reference/hooks/wp_count_attachments/) - Filters the attachment counts by mime type.
- [`wp_count_posts`](https://developer.wordpress.org/reference/hooks/wp_count_posts/) - Filters the post counts by status for the current post type.
- [`wp_link_query`](https://developer.wordpress.org/reference/hooks/wp_link_query/) - Filters the link query results.
- [`wp_link_query_args`](https://developer.wordpress.org/reference/hooks/wp_link_query_args/) - Filters the link query arguments.
- [`wp_search_stopwords`](https://developer.wordpress.org/reference/hooks/wp_search_stopwords/) - Filters stopwords used when parsing search terms.

### Changes

- [`upgrader_process_complete`](https://developer.wordpress.org/reference/hooks/upgrader_process_complete/) - Added to WP_Upgrader::run().
- [`user_has_cap`](https://developer.wordpress.org/reference/hooks/user_has_cap/) - Added the <code>$user</code> parameter.

## WordPress 3.6

### New Actions

- [`after_menu_locations_table`](https://developer.wordpress.org/reference/hooks/after_menu_locations_table/) - Fires after the menu locations table is displayed.
- [`customize_save_after`](https://developer.wordpress.org/reference/hooks/customize_save_after/) - Fires after Customize settings have been saved.
- [`heartbeat_nopriv_tick`](https://developer.wordpress.org/reference/hooks/heartbeat_nopriv_tick/) - Fires when Heartbeat ticks in no-privilege environments.
- [`heartbeat_tick`](https://developer.wordpress.org/reference/hooks/heartbeat_tick/) - Fires when Heartbeat ticks in logged-in environments.
- [`post_lock_lost_dialog`](https://developer.wordpress.org/reference/hooks/post_lock_lost_dialog/) - Fires inside the dialog displayed when a user has lost the post lock.
- [`post_locked_dialog`](https://developer.wordpress.org/reference/hooks/post_locked_dialog/) - Fires inside the post locked dialog before the buttons are displayed.
- [`upgrader_process_complete`](https://developer.wordpress.org/reference/hooks/upgrader_process_complete/) - Fires when the upgrader process is complete.

### New Filters

- [`_wp_post_revision_field_{$field}`](https://developer.wordpress.org/reference/hooks/_wp_post_revision_field_field/) - Contextually filter a post revision field.
- [`comment_link`](https://developer.wordpress.org/reference/hooks/comment_link/) - Filters the current comment's permalink.
- [`comments_link_feed`](https://developer.wordpress.org/reference/hooks/comments_link_feed/) - Filters the comments permalink for the current post.
- [`get_attached_media`](https://developer.wordpress.org/reference/hooks/get_attached_media/) - Filters the list of media attached to the given post.
- [`get_attached_media_args`](https://developer.wordpress.org/reference/hooks/get_attached_media_args/) - Filters arguments used to retrieve media attached to the given post.
- [`get_comments_link`](https://developer.wordpress.org/reference/hooks/get_comments_link/) - Filters the returned post comments permalink.
- [`get_post_galleries`](https://developer.wordpress.org/reference/hooks/get_post_galleries/) - Filters the list of all found galleries in the given post.
- [`get_post_gallery`](https://developer.wordpress.org/reference/hooks/get_post_gallery/) - Filters the first-found post gallery.
- [`heartbeat_nopriv_received`](https://developer.wordpress.org/reference/hooks/heartbeat_nopriv_received/) - Filters Heartbeat Ajax response in no-privilege environments.
- [`heartbeat_nopriv_send`](https://developer.wordpress.org/reference/hooks/heartbeat_nopriv_send/) - Filters Heartbeat Ajax response in no-privilege environments when no data is passed.
- [`heartbeat_received`](https://developer.wordpress.org/reference/hooks/heartbeat_received/) - Filters the Heartbeat response received.
- [`heartbeat_send`](https://developer.wordpress.org/reference/hooks/heartbeat_send/) - Filters the Heartbeat response sent.
- [`heartbeat_settings`](https://developer.wordpress.org/reference/hooks/heartbeat_settings/) - Filters the Heartbeat settings.
- [`http_request_host_is_external`](https://developer.wordpress.org/reference/hooks/http_request_host_is_external/) - Checks if HTTP request is external or not.
- [`http_request_reject_unsafe_urls`](https://developer.wordpress.org/reference/hooks/http_request_reject_unsafe_urls/) - Filters whether to pass URLs through wp_http_validate_url() in an HTTP request.
- [`nav_menu_link_attributes`](https://developer.wordpress.org/reference/hooks/nav_menu_link_attributes/) - Filters the HTML attributes applied to a menu item's anchor element.
- [`override_post_lock`](https://developer.wordpress.org/reference/hooks/override_post_lock/) - Filters whether to allow the post lock to be overridden.
- [`pingback_ping_source_uri`](https://developer.wordpress.org/reference/hooks/pingback_ping_source_uri/) - Filters the pingback source URI.
- [`register_url`](https://developer.wordpress.org/reference/hooks/register_url/) - Filters the user registration URL.
- [`search_form_format`](https://developer.wordpress.org/reference/hooks/search_form_format/) - Filters the HTML format of the search form.
- [`self_link`](https://developer.wordpress.org/reference/hooks/self_link/) - Filters the current feed URL.
- [`shortcode_atts_{$shortcode}`](https://developer.wordpress.org/reference/hooks/shortcode_atts_shortcode/) - Filters shortcode attributes.
- [`show_post_locked_dialog`](https://developer.wordpress.org/reference/hooks/show_post_locked_dialog/) - Filters whether to show the post locked dialog.
- [`user_search_columns`](https://developer.wordpress.org/reference/hooks/user_search_columns/) - Filters the columns to search in a WP_User_Query search.
- [`widget_meta_poweredby`](https://developer.wordpress.org/reference/hooks/widget_meta_poweredby/) - Filters the "WordPress.org" list item HTML in the Meta widget.
- [`wp_audio_embed_handler`](https://developer.wordpress.org/reference/hooks/wp_audio_embed_handler/) - Filters the audio embed handler callback.
- [`wp_audio_extensions`](https://developer.wordpress.org/reference/hooks/wp_audio_extensions/) - Filters the list of supported audio formats.
- [`wp_audio_shortcode`](https://developer.wordpress.org/reference/hooks/wp_audio_shortcode/) - Filters the audio shortcode output.
- [`wp_audio_shortcode_class`](https://developer.wordpress.org/reference/hooks/wp_audio_shortcode_class/) - Filters the class attribute for the audio shortcode output container.
- [`wp_audio_shortcode_library`](https://developer.wordpress.org/reference/hooks/wp_audio_shortcode_library/) - Filters the media library used for the audio shortcode.
- [`wp_audio_shortcode_override`](https://developer.wordpress.org/reference/hooks/wp_audio_shortcode_override/) - Filters the default audio shortcode output.
- [`wp_auth_check_load`](https://developer.wordpress.org/reference/hooks/wp_auth_check_load/) - Filters whether to load the authentication check.
- [`wp_auth_check_same_domain`](https://developer.wordpress.org/reference/hooks/wp_auth_check_same_domain/) - Filters whether the authentication check originated at the same domain.
- [`wp_embed_handler_audio`](https://developer.wordpress.org/reference/hooks/wp_embed_handler_audio/) - Filters the audio embed output.
- [`wp_embed_handler_video`](https://developer.wordpress.org/reference/hooks/wp_embed_handler_video/) - Filters the video embed output.
- [`wp_http_accept_encoding`](https://developer.wordpress.org/reference/hooks/wp_http_accept_encoding/) - Filters the allowed encoding types.
- [`wp_link_pages`](https://developer.wordpress.org/reference/hooks/wp_link_pages/) - Filters the HTML output of page links for paginated posts.
- [`wp_link_pages_link`](https://developer.wordpress.org/reference/hooks/wp_link_pages_link/) - Filters the HTML output of individual page number links.
- [`wp_login_errors`](https://developer.wordpress.org/reference/hooks/wp_login_errors/) - Filters the login page errors.
- [`wp_mediaelement_fallback`](https://developer.wordpress.org/reference/hooks/wp_mediaelement_fallback/) - Filters the MediaElement fallback output for no-JS.
- [`wp_nav_locations_listed_per_menu`](https://developer.wordpress.org/reference/hooks/wp_nav_locations_listed_per_menu/) - Filters the number of locations listed per menu in the drop-down select.
- [`wp_revisions_to_keep`](https://developer.wordpress.org/reference/hooks/wp_revisions_to_keep/) - Filters the number of revisions to save for the given post.
- [`wp_save_post_revision_check_for_changes`](https://developer.wordpress.org/reference/hooks/wp_save_post_revision_check_for_changes/) - Filters whether the post has changed since the latest revision.
- [`wp_video_embed_handler`](https://developer.wordpress.org/reference/hooks/wp_video_embed_handler/) - Filters the video embed handler callback.
- [`wp_video_extensions`](https://developer.wordpress.org/reference/hooks/wp_video_extensions/) - Filters the list of supported video formats.
- [`wp_video_shortcode`](https://developer.wordpress.org/reference/hooks/wp_video_shortcode/) - Filters the output of the video shortcode.
- [`wp_video_shortcode_class`](https://developer.wordpress.org/reference/hooks/wp_video_shortcode_class/) - Filters the class attribute for the video shortcode output container.
- [`wp_video_shortcode_library`](https://developer.wordpress.org/reference/hooks/wp_video_shortcode_library/) - Filters the media library used for the video shortcode.
- [`wp_video_shortcode_override`](https://developer.wordpress.org/reference/hooks/wp_video_shortcode_override/) - Filters the default video shortcode output.

### Changes

- [`display_post_states`](https://developer.wordpress.org/reference/hooks/display_post_states/) - Added the <code>$post</code> parameter.
- [`set_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/set_transient_transient/) - The <code>$value</code> and <code>$expiration</code> parameters were added.
- [`set_user_role`](https://developer.wordpress.org/reference/hooks/set_user_role/) - Added <code>$old_roles</code> to include an array of the user's previous roles.

## WordPress 3.5

### New Actions

- [`after_theme_row_{$stylesheet}`](https://developer.wordpress.org/reference/hooks/after_theme_row_stylesheet/) - Fires after each specific row in the Multisite themes list table.
- [`attachment_submitbox_misc_actions`](https://developer.wordpress.org/reference/hooks/attachment_submitbox_misc_actions/) - Fires after the 'Uploaded on' section of the Save meta box in the attachment editing screen.
- [`edit_form_after_editor`](https://developer.wordpress.org/reference/hooks/edit_form_after_editor/) - Fires after the content editor.
- [`edit_form_after_title`](https://developer.wordpress.org/reference/hooks/edit_form_after_title/) - Fires after the title field.
- [`export_filters`](https://developer.wordpress.org/reference/hooks/export_filters/) - Fires at the end of the export filters form.
- [`load-importer-{$importer}`](https://developer.wordpress.org/reference/hooks/load-importer-importer/) - Fires before an importer screen is loaded.
- [`make_delete_blog`](https://developer.wordpress.org/reference/hooks/make_delete_blog/) - Fires when the 'flagged for deletion' status is added to a site.
- [`make_undelete_blog`](https://developer.wordpress.org/reference/hooks/make_undelete_blog/) - Fires when the 'flagged for deletion' status is removed from a site.
- [`print_media_templates`](https://developer.wordpress.org/reference/hooks/print_media_templates/) - Fires when the custom Backbone media templates are printed.
- [`restrict_manage_comments`](https://developer.wordpress.org/reference/hooks/restrict_manage_comments/) - Fires just before the Filter submit button for comment types.
- [`restrict_manage_users`](https://developer.wordpress.org/reference/hooks/restrict_manage_users/) - Fires just before the closing div containing the bulk role-change controls in the Users list table.
- [`upload_ui_over_quota`](https://developer.wordpress.org/reference/hooks/upload_ui_over_quota/) - Fires when an upload will exceed the defined upload space quota for a network site.
- [`validate_password_reset`](https://developer.wordpress.org/reference/hooks/validate_password_reset/) - Fires before the password reset procedure is validated.
- [`welcome_panel`](https://developer.wordpress.org/reference/hooks/welcome_panel/) - Fires when adding content to the welcome panel on the admin dashboard.
- [`wp_enqueue_media`](https://developer.wordpress.org/reference/hooks/wp_enqueue_media/) - Fires at the conclusion of wp_enqueue_media().
- [`xmlrpc_rsd_apis`](https://developer.wordpress.org/reference/hooks/xmlrpc_rsd_apis/) - Fires when adding APIs to the Really Simple Discovery (RSD) endpoint.

### New Filters

- [`blog_option_{$option}`](https://developer.wordpress.org/reference/hooks/blog_option_option/) - Filters a blog option value.
- [`cron_request`](https://developer.wordpress.org/reference/hooks/cron_request/) - Filters the cron request arguments.
- [`do_parse_request`](https://developer.wordpress.org/reference/hooks/do_parse_request/) - Filters whether to parse the request.
- [`domain_exists`](https://developer.wordpress.org/reference/hooks/domain_exists/) - Filters whether a site name is taken.
- [`exit_on_http_head`](https://developer.wordpress.org/reference/hooks/exit_on_http_head/) - Filters whether to allow 'HEAD' requests to generate content.
- [`export_args`](https://developer.wordpress.org/reference/hooks/export_args/) - Filters the export args.
- [`get_edit_user_link`](https://developer.wordpress.org/reference/hooks/get_edit_user_link/) - Filters the user edit link.
- [`image_editor_default_mime_type`](https://developer.wordpress.org/reference/hooks/image_editor_default_mime_type/) - Filters default mime type prior to getting the file extension.
- [`image_editor_save_pre`](https://developer.wordpress.org/reference/hooks/image_editor_save_pre/) - Filters the WP_Image_Editor instance for the image to be streamed to the browser.
- [`image_memory_limit`](https://developer.wordpress.org/reference/hooks/image_memory_limit/) - Filters the memory limit allocated for image manipulation.
- [`is_email_address_unsafe`](https://developer.wordpress.org/reference/hooks/is_email_address_unsafe/) - Filters whether an email address is unsafe.
- [`login_body_class`](https://developer.wordpress.org/reference/hooks/login_body_class/) - Filters the login page body classes.
- [`manage_taxonomies_for_attachment_columns`](https://developer.wordpress.org/reference/hooks/manage_taxonomies_for_attachment_columns/) - Filters the taxonomy columns for attachments in the Media list table.
- [`manage_taxonomies_for_{$post_type}_columns`](https://developer.wordpress.org/reference/hooks/manage_taxonomies_for_post_type_columns/) - Filters the taxonomy columns in the Posts list table.
- [`media_view_settings`](https://developer.wordpress.org/reference/hooks/media_view_settings/) - Filters the media view settings.
- [`media_view_strings`](https://developer.wordpress.org/reference/hooks/media_view_strings/) - Filters the media view strings.
- [`mime_types`](https://developer.wordpress.org/reference/hooks/mime_types/) - Filters the list of mime types and file extensions.
- [`nonce_user_logged_out`](https://developer.wordpress.org/reference/hooks/nonce_user_logged_out/) - Filters whether the user who generated the nonce is logged out.
- [`post_link_category`](https://developer.wordpress.org/reference/hooks/post_link_category/) - Filters the category that gets used in the %category% permalink token.
- [`post_type_labels_{$post_type}`](https://developer.wordpress.org/reference/hooks/post_type_labels_post_type/) - Filters the labels of a specific post type.
- [`pre_get_space_used`](https://developer.wordpress.org/reference/hooks/pre_get_space_used/) - Filters the amount of storage space used by the current site, in megabytes.
- [`pre_http_send_through_proxy`](https://developer.wordpress.org/reference/hooks/pre_http_send_through_proxy/) - Filters whether to preempt sending the request through the proxy.
- [`wp_checkdate`](https://developer.wordpress.org/reference/hooks/wp_checkdate/) - Filters whether the given date is valid for the Gregorian calendar.
- [`wp_editor_set_quality`](https://developer.wordpress.org/reference/hooks/wp_editor_set_quality/) - Filters the default image compression quality setting.
- [`wp_get_update_data`](https://developer.wordpress.org/reference/hooks/wp_get_update_data/) - Filters the returned array of update data for plugins, themes, and WordPress core.
- [`wp_image_editor_before_change`](https://developer.wordpress.org/reference/hooks/wp_image_editor_before_change/) - Filters the WP_Image_Editor instance before applying changes to the image.
- [`wp_image_editors`](https://developer.wordpress.org/reference/hooks/wp_image_editors/) - Filters the list of image editing library classes.
- [`wp_kses_allowed_html`](https://developer.wordpress.org/reference/hooks/wp_kses_allowed_html/) - Filters the HTML tags that are allowed for a given context.
- [`wp_prepare_attachment_for_js`](https://developer.wordpress.org/reference/hooks/wp_prepare_attachment_for_js/) - Filters the attachment data prepared for JavaScript.
- [`wp_save_image_editor_file`](https://developer.wordpress.org/reference/hooks/wp_save_image_editor_file/) - Filters whether to skip saving the image file.
- [`xmlrpc_default_revision_fields`](https://developer.wordpress.org/reference/hooks/xmlrpc_default_revision_fields/) - Filters the default revision query fields used by the given XML-RPC method.
- [`xmlrpc_default_user_fields`](https://developer.wordpress.org/reference/hooks/xmlrpc_default_user_fields/) - Filters the default user query fields used by the given XML-RPC method.
- [`xmlrpc_enabled`](https://developer.wordpress.org/reference/hooks/xmlrpc_enabled/) - Filters whether XML-RPC methods requiring authentication are enabled.
- [`xmlrpc_login_error`](https://developer.wordpress.org/reference/hooks/xmlrpc_login_error/) - Filters the XML-RPC user login error message.
- [`xmlrpc_pingback_error`](https://developer.wordpress.org/reference/hooks/xmlrpc_pingback_error/) (3.5.1) - Filters the XML-RPC pingback error return.
- [`xmlrpc_prepare_user`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_user/) - Filters XML-RPC-prepared data for the given user.
- [`{$adjacent}_image_link`](https://developer.wordpress.org/reference/hooks/adjacent_image_link/) - Filters the adjacent image link.

### Changes

- [`admin_post_thumbnail_html`](https://developer.wordpress.org/reference/hooks/admin_post_thumbnail_html/) - Added the <code>$post_id</code> parameter.

## WordPress 3.4

### New Actions

- [`customize_controls_enqueue_scripts`](https://developer.wordpress.org/reference/hooks/customize_controls_enqueue_scripts/) - Fires when enqueuing Customizer control scripts.
- [`customize_controls_init`](https://developer.wordpress.org/reference/hooks/customize_controls_init/) - Fires when Customizer controls are initialized, before scripts are enqueued.
- [`customize_controls_print_footer_scripts`](https://developer.wordpress.org/reference/hooks/customize_controls_print_footer_scripts/) - Prints templates, control scripts, and settings in the footer.
- [`customize_controls_print_scripts`](https://developer.wordpress.org/reference/hooks/customize_controls_print_scripts/) - Fires when Customizer control scripts are printed.
- [`customize_controls_print_styles`](https://developer.wordpress.org/reference/hooks/customize_controls_print_styles/) - Fires when Customizer control styles are printed.
- [`customize_preview_init`](https://developer.wordpress.org/reference/hooks/customize_preview_init/) - Fires once the Customizer preview has initialized and JavaScript settings have been printed.
- [`customize_preview_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_preview_this-id/) - Fires when the WP_Customize_Setting::preview() method is called for settings not handled as theme_mods or options.
- [`customize_register`](https://developer.wordpress.org/reference/hooks/customize_register/) - Fires once WordPress has loaded, allowing scripts and styles to be initialized.
- [`customize_render_control`](https://developer.wordpress.org/reference/hooks/customize_render_control/) - Fires just before the current Customizer control is rendered.
- [`customize_render_control_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_render_control_this-id/) - Fires just before a specific Customizer control is rendered.
- [`customize_render_section`](https://developer.wordpress.org/reference/hooks/customize_render_section/) - Fires before rendering a Customizer section.
- [`customize_render_section_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_render_section_this-id/) - Fires before rendering a specific Customizer section.
- [`customize_save`](https://developer.wordpress.org/reference/hooks/customize_save/) - Fires once the theme has switched in the Customizer, but before settings have been saved.
- [`customize_save_{$id_base}`](https://developer.wordpress.org/reference/hooks/customize_save_id_base/) - Fires when the WP_Customize_Setting::save() method is called.
- [`customize_update_{$this->type}`](https://developer.wordpress.org/reference/hooks/customize_update_this-type/) - Fires when the WP_Customize_Setting::update() method is called for settings not handled as theme_mods or options.
- [`delete_{$meta_type}meta`](https://developer.wordpress.org/reference/hooks/delete_meta_typemeta/) - Fires immediately before deleting post or comment metadata of a specific type.
- [`deleted_{$meta_type}meta`](https://developer.wordpress.org/reference/hooks/deleted_meta_typemeta/) - Fires immediately after deleting post or comment metadata of a specific type.
- [`set_comment_cookies`](https://developer.wordpress.org/reference/hooks/set_comment_cookies/) - Fires after comment cookies are set.
- [`start_previewing_theme`](https://developer.wordpress.org/reference/hooks/start_previewing_theme/) - Fires once the Customizer theme preview has started.
- [`stop_previewing_theme`](https://developer.wordpress.org/reference/hooks/stop_previewing_theme/) - Fires once the Customizer theme preview has stopped.
- [`xmlrpc_call_success_blogger_deletePost`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_blogger_deletePost/) - Fires after a post has been successfully deleted via the XML-RPC Blogger API.
- [`xmlrpc_call_success_blogger_editPost`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_blogger_editPost/) - Fires after a post has been successfully updated via the XML-RPC Blogger API.
- [`xmlrpc_call_success_blogger_newPost`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_blogger_newPost/) - Fires after a new post has been successfully created via the XML-RPC Blogger API.
- [`xmlrpc_call_success_mw_editPost`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_mw_editPost/) - Fires after a post has been successfully updated via the XML-RPC MovableType API.
- [`xmlrpc_call_success_mw_newMediaObject`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_mw_newMediaObject/) - Fires after a new attachment has been added via the XML-RPC MovableType API.
- [`xmlrpc_call_success_mw_newPost`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_mw_newPost/) - Fires after a new post has been successfully created via the XML-RPC MovableType API.
- [`xmlrpc_call_success_wp_deleteCategory`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_wp_deleteCategory/) - Fires after a category has been successfully deleted via XML-RPC.
- [`xmlrpc_call_success_wp_deleteComment`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_wp_deleteComment/) - Fires after a comment has been successfully deleted via XML-RPC.
- [`xmlrpc_call_success_wp_deletePage`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_wp_deletePage/) - Fires after a page has been successfully deleted via XML-RPC.
- [`xmlrpc_call_success_wp_editComment`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_wp_editComment/) - Fires after a comment has been successfully updated via XML-RPC.
- [`xmlrpc_call_success_wp_newCategory`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_wp_newCategory/) - Fires after a new category has been successfully created via XML-RPC.
- [`xmlrpc_call_success_wp_newComment`](https://developer.wordpress.org/reference/hooks/xmlrpc_call_success_wp_newComment/) - Fires after a new comment has been successfully created via XML-RPC.

### New Filters

- [`allowed_http_origin`](https://developer.wordpress.org/reference/hooks/allowed_http_origin/) - Changes the allowed HTTP origin result.
- [`allowed_http_origins`](https://developer.wordpress.org/reference/hooks/allowed_http_origins/) - Changes the origin types allowed for HTTP requests.
- [`autocomplete_users_for_site_admins`](https://developer.wordpress.org/reference/hooks/autocomplete_users_for_site_admins/) - Filters whether to enable user auto-complete for non-super admins in Multisite.
- [`current_theme_supports-{$feature}`](https://developer.wordpress.org/reference/hooks/current_theme_supports-feature/) - Filters whether the active theme supports a specific feature.
- [`customize_allowed_urls`](https://developer.wordpress.org/reference/hooks/customize_allowed_urls/) - Filters the list of URLs allowed to be clicked and followed in the Customizer preview.
- [`customize_sanitize_js_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_sanitize_js_this-id/) - Filters a Customize setting value for use in JavaScript.
- [`customize_sanitize_{$this->id}`](https://developer.wordpress.org/reference/hooks/customize_sanitize_this-id/) - Filters a Customize setting value in un-slashed form.
- [`customize_value_{$id_base}`](https://developer.wordpress.org/reference/hooks/customize_value_id_base/) - Filters a Customize setting value not handled as a theme_mod or option.
- [`default_option_{$option}`](https://developer.wordpress.org/reference/hooks/default_option_option/) - Filters the default value for an option.
- [`default_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/default_site_option_option/) - Filters the value of a specific default network option.
- [`http_origin`](https://developer.wordpress.org/reference/hooks/http_origin/) - Changes the origin of an HTTP request.
- [`image_resize_dimensions`](https://developer.wordpress.org/reference/hooks/image_resize_dimensions/) - Filters whether to preempt calculating the image resize dimensions.
- [`plupload_default_params`](https://developer.wordpress.org/reference/hooks/plupload_default_params/) - Filters the Plupload default parameters.
- [`plupload_default_settings`](https://developer.wordpress.org/reference/hooks/plupload_default_settings/) - Filters the Plupload default settings.
- [`post_types_to_delete_with_user`](https://developer.wordpress.org/reference/hooks/post_types_to_delete_with_user/) - Filters the list of post types to delete with a user.
- [`posts_request_ids`](https://developer.wordpress.org/reference/hooks/posts_request_ids/) - Filters the Post IDs SQL request before sending.
- [`sanitize_trackback_urls`](https://developer.wordpress.org/reference/hooks/sanitize_trackback_urls/) - Filters a list of trackback URLs following sanitization.
- [`set_url_scheme`](https://developer.wordpress.org/reference/hooks/set_url_scheme/) - Filters the resulting URL after setting the scheme.
- [`split_the_query`](https://developer.wordpress.org/reference/hooks/split_the_query/) - Filters whether to split the query.
- [`theme_install_actions`](https://developer.wordpress.org/reference/hooks/theme_install_actions/) - Filters the install action links for a theme in the Install Themes list table.
- [`widget_comments_args`](https://developer.wordpress.org/reference/hooks/widget_comments_args/) - Filters the arguments for the Recent Comments widget.
- [`widget_posts_args`](https://developer.wordpress.org/reference/hooks/widget_posts_args/) - Filters the arguments for the Recent Posts widget.
- [`wp_cache_themes_persistently`](https://developer.wordpress.org/reference/hooks/wp_cache_themes_persistently/) - Filters whether to get the cache of the registered theme directories.
- [`wp_die_ajax_handler`](https://developer.wordpress.org/reference/hooks/wp_die_ajax_handler/) - Filters the callback for killing WordPress execution for Ajax requests.
- [`wp_die_xmlrpc_handler`](https://developer.wordpress.org/reference/hooks/wp_die_xmlrpc_handler/) - Filters the callback for killing WordPress execution for XML-RPC requests.
- [`wp_http_cookie_value`](https://developer.wordpress.org/reference/hooks/wp_http_cookie_value/) - Filters the header-encoded cookie value.
- [`wp_terms_checklist_args`](https://developer.wordpress.org/reference/hooks/wp_terms_checklist_args/) - Filters the taxonomy terms checklist arguments.
- [`xmlrpc_default_post_fields`](https://developer.wordpress.org/reference/hooks/xmlrpc_default_post_fields/) - Filters the default post query fields used by the given XML-RPC method.
- [`xmlrpc_default_posttype_fields`](https://developer.wordpress.org/reference/hooks/xmlrpc_default_posttype_fields/) - Filters the default post type query fields used by the given XML-RPC method.
- [`xmlrpc_default_taxonomy_fields`](https://developer.wordpress.org/reference/hooks/xmlrpc_default_taxonomy_fields/) - Filters the default taxonomy query fields used by the given XML-RPC method.
- [`xmlrpc_prepare_comment`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_comment/) - Filters XML-RPC-prepared data for the given comment.
- [`xmlrpc_prepare_media_item`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_media_item/) - Filters XML-RPC-prepared data for the given media item.
- [`xmlrpc_prepare_page`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_page/) - Filters XML-RPC-prepared data for the given page.
- [`xmlrpc_prepare_post`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_post/) - Filters XML-RPC-prepared date for the given post.
- [`xmlrpc_prepare_post_type`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_post_type/) - Filters XML-RPC-prepared date for the given post type.
- [`xmlrpc_prepare_taxonomy`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_taxonomy/) - Filters XML-RPC-prepared data for the given taxonomy.
- [`xmlrpc_prepare_term`](https://developer.wordpress.org/reference/hooks/xmlrpc_prepare_term/) - Filters XML-RPC-prepared data for the given term.
- [`xmlrpc_wp_insert_post_data`](https://developer.wordpress.org/reference/hooks/xmlrpc_wp_insert_post_data/) - Filters post data array to be inserted via XML-RPC.

### Changes

_No changes in this version._

## WordPress 3.3

### New Actions

- [`_core_updated_successfully`](https://developer.wordpress.org/reference/hooks/_core_updated_successfully/) - Fires after WordPress core has been successfully updated.
- [`after_switch_theme`](https://developer.wordpress.org/reference/hooks/after_switch_theme/) - Fires on the next WP load after the theme has been switched.
- [`registered_post_type`](https://developer.wordpress.org/reference/hooks/registered_post_type/) - Fires after a post type is registered.
- [`registered_taxonomy`](https://developer.wordpress.org/reference/hooks/registered_taxonomy/) - Fires after a taxonomy is registered.
- [`wp_trash_post`](https://developer.wordpress.org/reference/hooks/wp_trash_post/) - Fires before a post is sent to the Trash.

### New Filters

- [`auth_{$object_type}_meta_{$meta_key}`](https://developer.wordpress.org/reference/hooks/auth_object_type_meta_meta_key/) - Filters whether the user is allowed to edit a specific meta key of a specific object type.
- [`dbdelta_create_queries`](https://developer.wordpress.org/reference/hooks/dbdelta_create_queries/) - Filters the dbDelta SQL queries for creating tables and/or databases.
- [`dbdelta_insert_queries`](https://developer.wordpress.org/reference/hooks/dbdelta_insert_queries/) - Filters the dbDelta SQL queries for inserting or updating.
- [`dbdelta_queries`](https://developer.wordpress.org/reference/hooks/dbdelta_queries/) - Filters the dbDelta SQL queries.
- [`hidden_meta_boxes`](https://developer.wordpress.org/reference/hooks/hidden_meta_boxes/) - Filters the list of hidden meta boxes.
- [`image_size_names_choose`](https://developer.wordpress.org/reference/hooks/image_size_names_choose/) - Filters the names and labels of the default image sizes.
- [`page_attributes_dropdown_pages_args`](https://developer.wordpress.org/reference/hooks/page_attributes_dropdown_pages_args/) - Filters the arguments used to generate a Pages drop-down element.
- [`plupload_init`](https://developer.wordpress.org/reference/hooks/plupload_init/) - Filters the default Plupload settings.
- [`pre_ent2ncr`](https://developer.wordpress.org/reference/hooks/pre_ent2ncr/) - Filters text before named entities are converted into numbered entities.
- [`print_late_styles`](https://developer.wordpress.org/reference/hooks/print_late_styles/) - Filters whether to print the styles queued too late for the HTML head.
- [`quicktags_settings`](https://developer.wordpress.org/reference/hooks/quicktags_settings/) - Filters the Quicktags settings.
- [`sanitize_{$object_type}_meta_{$meta_key}`](https://developer.wordpress.org/reference/hooks/sanitize_object_type_meta_meta_key/) - Filters the sanitization of a specific meta key of a specific meta type.
- [`tiny_mce_plugins`](https://developer.wordpress.org/reference/hooks/tiny_mce_plugins/) - Filters the list of default TinyMCE plugins.
- [`type_url_form_media`](https://developer.wordpress.org/reference/hooks/type_url_form_media/) - Filters the insert media from URL form HTML.
- [`wp_check_post_lock_window`](https://developer.wordpress.org/reference/hooks/wp_check_post_lock_window/) - Filters the post lock window duration.
- [`wp_insert_post_empty_content`](https://developer.wordpress.org/reference/hooks/wp_insert_post_empty_content/) - Filters whether the post should be considered "empty".
- [`wp_is_large_network`](https://developer.wordpress.org/reference/hooks/wp_is_large_network/) - Filters whether the network is considered large.
- [`wp_trim_words`](https://developer.wordpress.org/reference/hooks/wp_trim_words/) - Filters the text content after words have been trimmed.
- [`wp_unique_post_slug`](https://developer.wordpress.org/reference/hooks/wp_unique_post_slug/) - Filters the unique post slug.
- [`wxr_export_skip_postmeta`](https://developer.wordpress.org/reference/hooks/wxr_export_skip_postmeta/) - Filters whether to selectively skip post meta used for WXR exports.
- [`{$type}_send_to_editor_url`](https://developer.wordpress.org/reference/hooks/type_send_to_editor_url/) - Filters the URL sent to the editor for a specific media type.

### Changes

- [`auth_{$object_type}_meta_{$meta_key}`](https://developer.wordpress.org/reference/hooks/auth_object_type_meta_meta_key/) - As <code>auth_post_meta_{$meta_key}</code>.
- [`mce_buttons_2`](https://developer.wordpress.org/reference/hooks/mce_buttons_2/) - The <code>$editor_id</code> parameter was added.
- [`mce_buttons_3`](https://developer.wordpress.org/reference/hooks/mce_buttons_3/) - The <code>$editor_id</code> parameter was added.
- [`mce_buttons_4`](https://developer.wordpress.org/reference/hooks/mce_buttons_4/) - The <code>$editor_id</code> parameter was added.
- [`mce_buttons`](https://developer.wordpress.org/reference/hooks/mce_buttons/) - The <code>$editor_id</code> parameter was added.
- [`teeny_mce_before_init`](https://developer.wordpress.org/reference/hooks/teeny_mce_before_init/) - The <code>$editor_id</code> parameter was added.
- [`teeny_mce_buttons`](https://developer.wordpress.org/reference/hooks/teeny_mce_buttons/) - The <code>$editor_id</code> parameter was added.
- [`teeny_mce_plugins`](https://developer.wordpress.org/reference/hooks/teeny_mce_plugins/) - The <code>$editor_id</code> parameter was added.
- [`tiny_mce_before_init`](https://developer.wordpress.org/reference/hooks/tiny_mce_before_init/) - The <code>$editor_id</code> parameter was added.

## WordPress 3.2

### New Actions

- [`after_delete_post`](https://developer.wordpress.org/reference/hooks/after_delete_post/) - Fires after a post is deleted, at the conclusion of wp_delete_post().
- [`after_wp_tiny_mce`](https://developer.wordpress.org/reference/hooks/after_wp_tiny_mce/) - Fires after any core TinyMCE editor instances are created.
- [`atom_author`](https://developer.wordpress.org/reference/hooks/atom_author/) - Fires at the end of each Atom feed author entry.
- [`before_delete_post`](https://developer.wordpress.org/reference/hooks/before_delete_post/) - Fires before a post is deleted, at the start of wp_delete_post().
- [`before_wp_tiny_mce`](https://developer.wordpress.org/reference/hooks/before_wp_tiny_mce/) - Fires immediately before the TinyMCE settings are printed.
- [`login_init`](https://developer.wordpress.org/reference/hooks/login_init/) - Fires when the login form is initialized.
- [`update-core-custom_{$action}`](https://developer.wordpress.org/reference/hooks/update-core-custom_action/) - Fires for each custom update action on the WordPress Updates screen.

### New Filters

- [`browse-happy-notice`](https://developer.wordpress.org/reference/hooks/browse-happy-notice/) - Filters the notice output for the 'Browse Happy' nag meta box.
- [`close_comments_for_post_types`](https://developer.wordpress.org/reference/hooks/close_comments_for_post_types/) - Filters the list of post types to automatically close comments for.
- [`display_media_states`](https://developer.wordpress.org/reference/hooks/display_media_states/) - Filters the default media display states for items in the Media list table.
- [`found_users_query`](https://developer.wordpress.org/reference/hooks/found_users_query/) - Filters SELECT FOUND_ROWS() query for the current WP_User_Query instance.
- [`is_multi_author`](https://developer.wordpress.org/reference/hooks/is_multi_author/) - Filters whether the site has more than one author with published posts.
- [`is_protected_meta`](https://developer.wordpress.org/reference/hooks/is_protected_meta/) - Filters whether a meta key is considered protected.
- [`ms_user_row_actions`](https://developer.wordpress.org/reference/hooks/ms_user_row_actions/) - Filters the action links displayed under each user in the Network Admin Users list table.
- [`nav_menu_items_{$post_type_name}`](https://developer.wordpress.org/reference/hooks/nav_menu_items_post_type_name/) - Filters the posts displayed in the 'View All' tab of the current post type's menu items meta box.
- [`option_page_capability_{$option_page}`](https://developer.wordpress.org/reference/hooks/option_page_capability_option_page/) - Filters the capability required when using the Settings API.
- [`postbox_classes_{$screen_id}_{$box_id}`](https://developer.wordpress.org/reference/hooks/postbox_classes_screen_id_box_id/) - Filters the postbox classes for a specific screen and box ID combo.
- [`redirect_network_admin_request`](https://developer.wordpress.org/reference/hooks/redirect_network_admin_request/) - Filters whether to redirect the request to the Network Admin.
- [`redirect_user_admin_request`](https://developer.wordpress.org/reference/hooks/redirect_user_admin_request/) - Filters whether to redirect the request to the User Admin in Multisite.
- [`screen_options_show_screen`](https://developer.wordpress.org/reference/hooks/screen_options_show_screen/) - Filters whether to show the Screen Options tab.
- [`use_google_chrome_frame`](https://developer.wordpress.org/reference/hooks/use_google_chrome_frame/) - Filters whether Google Chrome Frame should be used, if available.

### Changes

_No changes in this version._

## WordPress 3.1

### New Actions

- [`_network_admin_menu`](https://developer.wordpress.org/reference/hooks/_network_admin_menu/) - Fires before the administration menu loads in the Network Admin.
- [`_user_admin_menu`](https://developer.wordpress.org/reference/hooks/_user_admin_menu/) - Fires before the administration menu loads in the User Admin.
- [`add_admin_bar_menus`](https://developer.wordpress.org/reference/hooks/add_admin_bar_menus/) - Fires after menus are added to the menu bar.
- [`add_{$meta_type}_meta`](https://developer.wordpress.org/reference/hooks/add_meta_type_meta/) - Fires immediately before meta of a specific type is added.
- [`admin_bar_init`](https://developer.wordpress.org/reference/hooks/admin_bar_init/) - Fires after WP_Admin_Bar is initialized.
- [`admin_bar_menu`](https://developer.wordpress.org/reference/hooks/admin_bar_menu/) - Loads all necessary admin bar items.
- [`admin_notices`](https://developer.wordpress.org/reference/hooks/admin_notices/) - Prints admin screen notices.
- [`after_theme_row`](https://developer.wordpress.org/reference/hooks/after_theme_row/) - Fires after each row in the Multisite themes list table.
- [`all_admin_notices`](https://developer.wordpress.org/reference/hooks/all_admin_notices/) - Prints generic admin screen notices.
- [`custom_header_options`](https://developer.wordpress.org/reference/hooks/custom_header_options/) - Fires just before the submit button in the custom header options form.
- [`delete_{$meta_type}_meta`](https://developer.wordpress.org/reference/hooks/delete_meta_type_meta/) - Fires immediately before deleting metadata of a specific type.
- [`doing_it_wrong_run`](https://developer.wordpress.org/reference/hooks/doing_it_wrong_run/) - Fires when the given function is being used incorrectly.
- [`in_theme_update_message-{$theme_key}`](https://developer.wordpress.org/reference/hooks/in_theme_update_message-theme_key/) - Fires at the end of the update message container in each row of the themes list table.
- [`login_enqueue_scripts`](https://developer.wordpress.org/reference/hooks/login_enqueue_scripts/) - Enqueues scripts and styles for the login page.
- [`login_footer`](https://developer.wordpress.org/reference/hooks/login_footer/) - Fires in the login page footer.
- [`manage_plugins_custom_column`](https://developer.wordpress.org/reference/hooks/manage_plugins_custom_column/) - Fires inside each custom column of the Plugins list table.
- [`manage_sites_custom_column`](https://developer.wordpress.org/reference/hooks/manage_sites_custom_column/) - Fires for each registered custom column in the Sites list table.
- [`manage_themes_custom_column`](https://developer.wordpress.org/reference/hooks/manage_themes_custom_column/) - Fires inside each custom column of the Multisite themes list table.
- [`manage_{$post->post_type}_posts_custom_column`](https://developer.wordpress.org/reference/hooks/manage_post-post_type_posts_custom_column/) - Fires for each custom column of a specific post type in the Posts list table.
- [`mature_blog`](https://developer.wordpress.org/reference/hooks/mature_blog/) - Fires when the 'mature' status is added to a site.
- [`network_admin_edit_{$action}`](https://developer.wordpress.org/reference/hooks/network_admin_edit_action/) - Fires the requested handler action.
- [`network_admin_menu`](https://developer.wordpress.org/reference/hooks/network_admin_menu/) - Fires before the administration menu loads in the Network Admin.
- [`network_admin_notices`](https://developer.wordpress.org/reference/hooks/network_admin_notices/) - Prints network admin screen notices.
- [`network_site_users_after_list_table`](https://developer.wordpress.org/reference/hooks/network_site_users_after_list_table/) - Fires after the list table on the Users screen in the Multisite Network Admin.
- [`post_comment_status_meta_box-options`](https://developer.wordpress.org/reference/hooks/post_comment_status_meta_box-options/) - Fires at the end of the Discussion meta box on the post editing screen.
- [`pre_get_comments`](https://developer.wordpress.org/reference/hooks/pre_get_comments/) - Fires before comments are retrieved.
- [`pre_user_query`](https://developer.wordpress.org/reference/hooks/pre_user_query/) - Fires after the WP_User_Query has been parsed, and before the query is executed.
- [`unmature_blog`](https://developer.wordpress.org/reference/hooks/unmature_blog/) - Fires when the 'mature' status is removed from a site.
- [`user_admin_menu`](https://developer.wordpress.org/reference/hooks/user_admin_menu/) - Fires before the administration menu loads in the User Admin.
- [`user_admin_notices`](https://developer.wordpress.org/reference/hooks/user_admin_notices/) - Prints user admin screen notices.
- [`wp_after_admin_bar_render`](https://developer.wordpress.org/reference/hooks/wp_after_admin_bar_render/) - Fires after the admin bar is rendered.
- [`wp_before_admin_bar_render`](https://developer.wordpress.org/reference/hooks/wp_before_admin_bar_render/) - Fires before the admin bar is rendered.
- [`wp_network_dashboard_setup`](https://developer.wordpress.org/reference/hooks/wp_network_dashboard_setup/) - Fires after core widgets for the Network Admin dashboard have been registered.
- [`wp_user_dashboard_setup`](https://developer.wordpress.org/reference/hooks/wp_user_dashboard_setup/) - Fires after core widgets for the User Admin dashboard have been registered.

### New Filters

- [`add_{$meta_type}_metadata`](https://developer.wordpress.org/reference/hooks/add_meta_type_metadata/) - Short-circuits adding metadata of a specific type.
- [`admin_title`](https://developer.wordpress.org/reference/hooks/admin_title/) - Filters the title tag content for an admin page.
- [`all_themes`](https://developer.wordpress.org/reference/hooks/all_themes/) - Filters the full array of WP_Theme objects to list in the Multisite themes list table.
- [`bulk_actions-{$this->screen->id}`](https://developer.wordpress.org/reference/hooks/bulk_actions-this-screen-id/) - Filters the items in the bulk actions menu of the list table.
- [`can_edit_network`](https://developer.wordpress.org/reference/hooks/can_edit_network/) - Filters whether this network can be edited from this page.
- [`comments_clauses`](https://developer.wordpress.org/reference/hooks/comments_clauses/) - Filters the comment query clauses.
- [`default_hidden_meta_boxes`](https://developer.wordpress.org/reference/hooks/default_hidden_meta_boxes/) - Filters the default list of hidden meta boxes.
- [`delete_{$meta_type}_metadata`](https://developer.wordpress.org/reference/hooks/delete_meta_type_metadata/) - Short-circuits deleting metadata of a specific type.
- [`doing_it_wrong_trigger_error`](https://developer.wordpress.org/reference/hooks/doing_it_wrong_trigger_error/) - Filters whether to trigger an error for _doing_it_wrong() calls.
- [`edit_profile_url`](https://developer.wordpress.org/reference/hooks/edit_profile_url/) - Filters the URL for a user's profile editor.
- [`edit_term_link`](https://developer.wordpress.org/reference/hooks/edit_term_link/) - Filters the anchor tag for the edit link of a term.
- [`enter_title_here`](https://developer.wordpress.org/reference/hooks/enter_title_here/) - Filters the title field placeholder text.
- [`esc_textarea`](https://developer.wordpress.org/reference/hooks/esc_textarea/) - Filters a string cleaned and escaped for output in a textarea element.
- [`force_filtered_html_on_import`](https://developer.wordpress.org/reference/hooks/force_filtered_html_on_import/) - Filters whether to filter imported data through kses on import.
- [`get_ancestors`](https://developer.wordpress.org/reference/hooks/get_ancestors/) - Filters a given object's ancestors.
- [`get_edit_term_link`](https://developer.wordpress.org/reference/hooks/get_edit_term_link/) - Filters the edit link for a term.
- [`get_media_item_args`](https://developer.wordpress.org/reference/hooks/get_media_item_args/) - Filters the arguments used to retrieve an image for the edit image form.
- [`get_meta_sql`](https://developer.wordpress.org/reference/hooks/get_meta_sql/) - Filters the meta query's generated SQL.
- [`get_terms_args`](https://developer.wordpress.org/reference/hooks/get_terms_args/) - Filters the terms query arguments.
- [`get_the_categories`](https://developer.wordpress.org/reference/hooks/get_the_categories/) - Filters the array of categories to return for a post.
- [`get_the_terms`](https://developer.wordpress.org/reference/hooks/get_the_terms/) - Filters the list of terms attached to the given post.
- [`get_{$meta_type}_metadata`](https://developer.wordpress.org/reference/hooks/get_meta_type_metadata/) - Short-circuits the return value of a meta field.
- [`list_pages`](https://developer.wordpress.org/reference/hooks/list_pages/) - Filters the page title when creating an HTML drop-down list of pages.
- [`load_image_to_edit_attachmenturl`](https://developer.wordpress.org/reference/hooks/load_image_to_edit_attachmenturl/) - Filters the path to an attachment's URL when editing the image.
- [`load_image_to_edit_filesystempath`](https://developer.wordpress.org/reference/hooks/load_image_to_edit_filesystempath/) - Filters the path to an attachment's file when editing the image.
- [`manage_sites_action_links`](https://developer.wordpress.org/reference/hooks/manage_sites_action_links/) - Filters the action links displayed for each site in the Sites list table.
- [`manage_{$this->screen->id}_sortable_columns`](https://developer.wordpress.org/reference/hooks/manage_this-screen-id_sortable_columns/) - Filters the list table sortable columns for a specific screen.
- [`media_upload_mime_type_links`](https://developer.wordpress.org/reference/hooks/media_upload_mime_type_links/) - Filters the media upload mime type list items.
- [`ms_user_list_site_actions`](https://developer.wordpress.org/reference/hooks/ms_user_list_site_actions/) - Filters the action links displayed next the sites a user belongs to in the Network Admin Users list table.
- [`network_admin_plugin_action_links`](https://developer.wordpress.org/reference/hooks/network_admin_plugin_action_links/) - Filters the action links displayed for each plugin in the Network Admin Plugins list table.
- [`network_admin_plugin_action_links_{$plugin_file}`](https://developer.wordpress.org/reference/hooks/network_admin_plugin_action_links_plugin_file/) - Filters the list of action links displayed for a specific plugin in the Network Admin Plugins list table.
- [`network_sites_updated_message_{$action}`](https://developer.wordpress.org/reference/hooks/network_sites_updated_message_action/) - Filters a specific, non-default, site-updated message in the Network admin.
- [`post_format_rewrite_base`](https://developer.wordpress.org/reference/hooks/post_format_rewrite_base/) - Filters the post formats rewrite base.
- [`post_type_archive_feed_link`](https://developer.wordpress.org/reference/hooks/post_type_archive_feed_link/) - Filters the post type archive feed link.
- [`post_type_archive_link`](https://developer.wordpress.org/reference/hooks/post_type_archive_link/) - Filters the post type archive permalink.
- [`post_type_archive_title`](https://developer.wordpress.org/reference/hooks/post_type_archive_title/) - Filters the post type archive title.
- [`posts_clauses`](https://developer.wordpress.org/reference/hooks/posts_clauses/) - Filters all query clauses at once, for convenience.
- [`posts_clauses_request`](https://developer.wordpress.org/reference/hooks/posts_clauses_request/) - Filters all query clauses at once, for convenience.
- [`sanitize_mime_type`](https://developer.wordpress.org/reference/hooks/sanitize_mime_type/) (3.1.3) - Filters a mime type following sanitization.
- [`schedule_event`](https://developer.wordpress.org/reference/hooks/schedule_event/) - Modify an event before it is scheduled.
- [`secure_auth_cookie`](https://developer.wordpress.org/reference/hooks/secure_auth_cookie/) - Filters whether the auth cookie should only be sent over HTTPS.
- [`secure_auth_redirect`](https://developer.wordpress.org/reference/hooks/secure_auth_redirect/) - Filters whether to use a secure authentication redirect.
- [`secure_logged_in_cookie`](https://developer.wordpress.org/reference/hooks/secure_logged_in_cookie/) - Filters whether the logged in cookie should only be sent over HTTPS.
- [`secure_signon_cookie`](https://developer.wordpress.org/reference/hooks/secure_signon_cookie/) - Filters whether to use a secure sign-on cookie.
- [`show_admin_bar`](https://developer.wordpress.org/reference/hooks/show_admin_bar/) - Filters whether to show the admin bar.
- [`show_network_site_users_add_existing_form`](https://developer.wordpress.org/reference/hooks/show_network_site_users_add_existing_form/) - Filters whether to show the Add Existing User form on the Multisite Users screen.
- [`show_network_site_users_add_new_form`](https://developer.wordpress.org/reference/hooks/show_network_site_users_add_new_form/) - Filters whether to show the Add New User form on the Multisite Users screen.
- [`show_recent_comments_widget_style`](https://developer.wordpress.org/reference/hooks/show_recent_comments_widget_style/) - Filters the Recent Comments default widget styles.
- [`single_term_title`](https://developer.wordpress.org/reference/hooks/single_term_title/) - Filters the custom taxonomy archive page title.
- [`terms_clauses`](https://developer.wordpress.org/reference/hooks/terms_clauses/) - Filters the terms query SQL clauses.
- [`the_comments`](https://developer.wordpress.org/reference/hooks/the_comments/) - Filters the comment query results.
- [`theme_action_links_{$stylesheet}`](https://developer.wordpress.org/reference/hooks/theme_action_links_stylesheet/) - Filters the action links of a specific theme in the Multisite themes list table.
- [`theme_row_meta`](https://developer.wordpress.org/reference/hooks/theme_row_meta/) - Filters the array of row meta for each theme in the Multisite themes list table.
- [`update_{$meta_type}_metadata`](https://developer.wordpress.org/reference/hooks/update_meta_type_metadata/) - Short-circuits updating metadata of a specific type.
- [`upload_post_params`](https://developer.wordpress.org/reference/hooks/upload_post_params/) - Filters the media upload post parameters.
- [`use_default_gallery_style`](https://developer.wordpress.org/reference/hooks/use_default_gallery_style/) - Filters whether to print default gallery styles.
- [`user_admin_url`](https://developer.wordpress.org/reference/hooks/user_admin_url/) - Filters the user admin URL for the current user.
- [`user_dashboard_url`](https://developer.wordpress.org/reference/hooks/user_dashboard_url/) - Filters the dashboard URL for a user.
- [`views_{$this->screen->id}`](https://developer.wordpress.org/reference/hooks/views_this-screen-id/) - Filters the list of available list table views.
- [`wp_admin_bar_class`](https://developer.wordpress.org/reference/hooks/wp_admin_bar_class/) - Filters the admin bar class to instantiate.
- [`wp_get_current_commenter`](https://developer.wordpress.org/reference/hooks/wp_get_current_commenter/) - Filters the current commenter's name, email, and URL.
- [`wp_insert_post_parent`](https://developer.wordpress.org/reference/hooks/wp_insert_post_parent/) - Filters the post parent -- used to check for and prevent hierarchy loops.
- [`wp_nav_menu_objects`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_objects/) - Filters the sorted list of menu item objects before generating the menu's HTML.
- [`wp_network_dashboard_widgets`](https://developer.wordpress.org/reference/hooks/wp_network_dashboard_widgets/) - Filters the list of widgets to load for the Network Admin dashboard.
- [`wp_unique_post_slug_is_bad_attachment_slug`](https://developer.wordpress.org/reference/hooks/wp_unique_post_slug_is_bad_attachment_slug/) - Filters whether the post slug would make a bad attachment slug.
- [`wp_unique_post_slug_is_bad_flat_slug`](https://developer.wordpress.org/reference/hooks/wp_unique_post_slug_is_bad_flat_slug/) - Filters whether the post slug would be bad as a flat slug.
- [`wp_unique_post_slug_is_bad_hierarchical_slug`](https://developer.wordpress.org/reference/hooks/wp_unique_post_slug_is_bad_hierarchical_slug/) - Filters whether the post slug would make a bad hierarchical post slug.
- [`wp_update_term_parent`](https://developer.wordpress.org/reference/hooks/wp_update_term_parent/) - Filters the term parent.
- [`wp_user_dashboard_widgets`](https://developer.wordpress.org/reference/hooks/wp_user_dashboard_widgets/) - Filters the list of widgets to load for the User Admin dashboard.
- [`wp_xmlrpc_server_class`](https://developer.wordpress.org/reference/hooks/wp_xmlrpc_server_class/) - Filters the class used for handling XML-RPC requests.
- [`{$permastructname}_rewrite_rules`](https://developer.wordpress.org/reference/hooks/permastructname_rewrite_rules/) - Filters rewrite rules used for individual permastructs.

### Changes

- [`gallery_style`](https://developer.wordpress.org/reference/hooks/gallery_style/) - Added classes for number of columns and size to opening div.
- [`upload_post_params`](https://developer.wordpress.org/reference/hooks/upload_post_params/) - As 'swfupload_post_params'

## WordPress 3.0

### New Actions

- [`activate_header`](https://developer.wordpress.org/reference/hooks/activate_header/) - Fires before the Site Activation page is loaded.
- [`activate_wp_head`](https://developer.wordpress.org/reference/hooks/activate_wp_head/) - Fires within the `<head>` section of the Site Activation page.
- [`add_meta_boxes`](https://developer.wordpress.org/reference/hooks/add_meta_boxes/) - Fires after all built-in meta boxes have been added.
- [`add_meta_boxes_comment`](https://developer.wordpress.org/reference/hooks/add_meta_boxes_comment/) - Fires when comment-specific meta boxes are added.
- [`add_meta_boxes_link`](https://developer.wordpress.org/reference/hooks/add_meta_boxes_link/) - Fires when link-specific meta boxes are added.
- [`add_meta_boxes_{$post_type}`](https://developer.wordpress.org/reference/hooks/add_meta_boxes_post_type/) - Fires after all built-in meta boxes have been added, contextually for the given post type.
- [`add_site_option`](https://developer.wordpress.org/reference/hooks/add_site_option/) - Fires after a network option has been successfully added.
- [`add_tag_form_fields`](https://developer.wordpress.org/reference/hooks/add_tag_form_fields/) - Fires after the Add Tag form fields for non-hierarchical taxonomies.
- [`admin_color_scheme_picker`](https://developer.wordpress.org/reference/hooks/admin_color_scheme_picker/) - Fires in the 'Administration Color Scheme' section of the user editing screen.
- [`after-{$taxonomy}-table`](https://developer.wordpress.org/reference/hooks/after-taxonomy-table/) - Fires after the taxonomy list table.
- [`after_setup_theme`](https://developer.wordpress.org/reference/hooks/after_setup_theme/) - Fires after the theme is loaded.
- [`after_signup_form`](https://developer.wordpress.org/reference/hooks/after_signup_form/) - Fires after the sign-up forms, before wp_footer.
- [`before_signup_form`](https://developer.wordpress.org/reference/hooks/before_signup_form/) - Fires before the site Sign-up form.
- [`clean_attachment_cache`](https://developer.wordpress.org/reference/hooks/clean_attachment_cache/) - Fires after the given attachment's cache is cleaned.
- [`comment_duplicate_trigger`](https://developer.wordpress.org/reference/hooks/comment_duplicate_trigger/) - Fires immediately after a duplicate comment is detected.
- [`comment_form_after`](https://developer.wordpress.org/reference/hooks/comment_form_after/) - Fires after the comment form.
- [`comment_form_after_fields`](https://developer.wordpress.org/reference/hooks/comment_form_after_fields/) - Fires after the comment fields in the comment form, excluding the textarea.
- [`comment_form_before`](https://developer.wordpress.org/reference/hooks/comment_form_before/) - Fires before the comment form.
- [`comment_form_before_fields`](https://developer.wordpress.org/reference/hooks/comment_form_before_fields/) - Fires before the comment fields in the comment form, excluding the textarea.
- [`comment_form_comments_closed`](https://developer.wordpress.org/reference/hooks/comment_form_comments_closed/) - Fires after the comment form if comments are closed.
- [`comment_form_logged_in_after`](https://developer.wordpress.org/reference/hooks/comment_form_logged_in_after/) - Fires after the is_user_logged_in() check in the comment form.
- [`comment_form_must_log_in_after`](https://developer.wordpress.org/reference/hooks/comment_form_must_log_in_after/) - Fires after the HTML-formatted 'must log in after' message in the comment form.
- [`comment_form_top`](https://developer.wordpress.org/reference/hooks/comment_form_top/) - Fires at the top of the comment form, inside the form tag.
- [`current_screen`](https://developer.wordpress.org/reference/hooks/current_screen/) - Fires after the current screen has been set.
- [`delete_option_{$option}`](https://developer.wordpress.org/reference/hooks/delete_option_option/) - Fires after a specific option has been deleted.
- [`delete_site_option`](https://developer.wordpress.org/reference/hooks/delete_site_option/) - Fires after a network option has been deleted.
- [`delete_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/delete_site_transient_transient/) - Fires immediately before a specific site transient is deleted.
- [`delete_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/delete_transient_transient/) - Fires immediately before a specific transient is deleted.
- [`deleted_site_transient`](https://developer.wordpress.org/reference/hooks/deleted_site_transient/) - Fires after a transient is deleted.
- [`deleted_transient`](https://developer.wordpress.org/reference/hooks/deleted_transient/) - Fires after a transient is deleted.
- [`deprecated_argument_run`](https://developer.wordpress.org/reference/hooks/deprecated_argument_run/) - Fires when a deprecated argument is called.
- [`do_meta_boxes`](https://developer.wordpress.org/reference/hooks/do_meta_boxes/) - Fires after meta boxes have been added.
- [`dynamic_sidebar`](https://developer.wordpress.org/reference/hooks/dynamic_sidebar/) - Fires before a widget's display callback is called.
- [`get_template_part_{$slug}`](https://developer.wordpress.org/reference/hooks/get_template_part_slug/) - Fires before the specified template part file is loaded.
- [`grant_super_admin`](https://developer.wordpress.org/reference/hooks/grant_super_admin/) - Fires before the user is granted Super Admin privileges.
- [`granted_super_admin`](https://developer.wordpress.org/reference/hooks/granted_super_admin/) - Fires after the user is granted Super Admin privileges.
- [`in_admin_header`](https://developer.wordpress.org/reference/hooks/in_admin_header/) - Fires at the beginning of the content section in an admin page.
- [`make_ham_user`](https://developer.wordpress.org/reference/hooks/make_ham_user/) - Fires after the user is marked as a HAM user. Opposite of SPAM.
- [`make_spam_user`](https://developer.wordpress.org/reference/hooks/make_spam_user/) - Fires after the user is marked as a SPAM user.
- [`myblogs_allblogs_options`](https://developer.wordpress.org/reference/hooks/myblogs_allblogs_options/) - Fires before the sites list on the My Sites screen.
- [`opml_head`](https://developer.wordpress.org/reference/hooks/opml_head/) - Fires in the OPML header.
- [`post_edit_form_tag`](https://developer.wordpress.org/reference/hooks/post_edit_form_tag/) - Fires inside the post editor form tag.
- [`post_updated`](https://developer.wordpress.org/reference/hooks/post_updated/) - Fires once an existing post has been updated.
- [`pre_current_active_plugins`](https://developer.wordpress.org/reference/hooks/pre_current_active_plugins/) - Fires before the plugins list table is rendered.
- [`pre_delete_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_delete_site_option_option/) - Fires immediately before a specific network option is deleted.
- [`preprocess_signup_form`](https://developer.wordpress.org/reference/hooks/preprocess_signup_form/) - Fires when the site sign-up form is sent.
- [`register_sidebar`](https://developer.wordpress.org/reference/hooks/register_sidebar/) - Fires once a sidebar has been registered.
- [`revoke_super_admin`](https://developer.wordpress.org/reference/hooks/revoke_super_admin/) - Fires before the user's Super Admin privileges are revoked.
- [`revoked_super_admin`](https://developer.wordpress.org/reference/hooks/revoked_super_admin/) - Fires after the user's Super Admin privileges are revoked.
- [`set_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/set_site_transient_transient/) - Fires after the value for a specific site transient has been set.
- [`set_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/set_transient_transient/) - Fires after the value for a specific transient has been set.
- [`signup_blogform`](https://developer.wordpress.org/reference/hooks/signup_blogform/) - Fires after the site sign-up form.
- [`signup_extra_fields`](https://developer.wordpress.org/reference/hooks/signup_extra_fields/) - Fires at the end of the new user account registration form.
- [`signup_finished`](https://developer.wordpress.org/reference/hooks/signup_finished/) - Fires when the site or user sign-up process is complete.
- [`signup_header`](https://developer.wordpress.org/reference/hooks/signup_header/) - Fires within the head section of the site sign-up screen.
- [`the_widget`](https://developer.wordpress.org/reference/hooks/the_widget/) - Fires before rendering the requested widget.
- [`unload_textdomain`](https://developer.wordpress.org/reference/hooks/unload_textdomain/) - Fires before the text domain is unloaded.
- [`update_site_option`](https://developer.wordpress.org/reference/hooks/update_site_option/) - Fires after the value of a network option has been successfully updated.
- [`user_edit_form_tag`](https://developer.wordpress.org/reference/hooks/user_edit_form_tag/) - Fires inside the your-profile form tag on the user editing screen.
- [`user_new_form_tag`](https://developer.wordpress.org/reference/hooks/user_new_form_tag/) - Fires inside the adduser form tag.
- [`widgets_admin_page`](https://developer.wordpress.org/reference/hooks/widgets_admin_page/) - Fires before the Widgets administration page content loads.
- [`wp_create_nav_menu`](https://developer.wordpress.org/reference/hooks/wp_create_nav_menu/) - Fires after a navigation menu is successfully created.
- [`wp_delete_nav_menu`](https://developer.wordpress.org/reference/hooks/wp_delete_nav_menu/) - Fires after a navigation menu has been successfully deleted.
- [`wp_feed_options`](https://developer.wordpress.org/reference/hooks/wp_feed_options/) - Fires just before processing the SimplePie feed object.
- [`wp_loaded`](https://developer.wordpress.org/reference/hooks/wp_loaded/) - This hook is fired once WP, all plugins, and the theme are fully loaded and instantiated.
- [`wp_register_sidebar_widget`](https://developer.wordpress.org/reference/hooks/wp_register_sidebar_widget/) - Fires once for each registered widget.
- [`wp_unregister_sidebar_widget`](https://developer.wordpress.org/reference/hooks/wp_unregister_sidebar_widget/) - Fires just before a widget is removed from a sidebar.
- [`wp_update_nav_menu`](https://developer.wordpress.org/reference/hooks/wp_update_nav_menu/) - Fires after a navigation menu has been successfully updated.
- [`wp_update_nav_menu_item`](https://developer.wordpress.org/reference/hooks/wp_update_nav_menu_item/) - Fires after a navigation menu item has been updated.
- [`wpmu_update_blog_options`](https://developer.wordpress.org/reference/hooks/wpmu_update_blog_options/) - Fires after the site options are updated.
- [`wpmuadminedit`](https://developer.wordpress.org/reference/hooks/wpmuadminedit/) - Fires just before the action handler in several Network Admin screens.
- [`wpmueditblogaction`](https://developer.wordpress.org/reference/hooks/wpmueditblogaction/) - Fires at the end of the Edit Site form, before the submit button.
- [`{$taxonomy}_add_form`](https://developer.wordpress.org/reference/hooks/taxonomy_add_form/) - Fires at the end of the Add Term form for all taxonomies.
- [`{$taxonomy}_add_form_fields`](https://developer.wordpress.org/reference/hooks/taxonomy_add_form_fields/) - Fires after the Add Term form fields.
- [`{$taxonomy}_edit_form`](https://developer.wordpress.org/reference/hooks/taxonomy_edit_form/) - Fires at the end of the Edit Term form for all taxonomies.
- [`{$taxonomy}_edit_form_fields`](https://developer.wordpress.org/reference/hooks/taxonomy_edit_form_fields/) - Fires after the Edit Term form fields are displayed.
- [`{$taxonomy}_pre_add_form`](https://developer.wordpress.org/reference/hooks/taxonomy_pre_add_form/) - Fires before the Add Term form for all taxonomies.
- [`{$taxonomy}_pre_edit_form`](https://developer.wordpress.org/reference/hooks/taxonomy_pre_edit_form/) - Fires before the Edit Term form for all taxonomies.

### New Filters

- [`add_signup_meta`](https://developer.wordpress.org/reference/hooks/add_signup_meta/) - Filters the new default site meta variables.
- [`admin_memory_limit`](https://developer.wordpress.org/reference/hooks/admin_memory_limit/) - Filters the maximum memory limit available for administration screens.
- [`all_plugins`](https://developer.wordpress.org/reference/hooks/all_plugins/) - Filters the full array of plugins to list in the Plugins list table.
- [`allow_subdirectory_install`](https://developer.wordpress.org/reference/hooks/allow_subdirectory_install/) - Filters whether to enable the subdirectory installation feature in Multisite.
- [`blog_redirect_404`](https://developer.wordpress.org/reference/hooks/blog_redirect_404/) - Filters the redirect URL for 404s on the main site.
- [`comment_form_default_fields`](https://developer.wordpress.org/reference/hooks/comment_form_default_fields/) - Filters the default comment form fields.
- [`comment_form_defaults`](https://developer.wordpress.org/reference/hooks/comment_form_defaults/) - Filters the comment form default arguments.
- [`comment_form_field_comment`](https://developer.wordpress.org/reference/hooks/comment_form_field_comment/) - Filters the content of the comment textarea field for display.
- [`comment_form_field_{$name}`](https://developer.wordpress.org/reference/hooks/comment_form_field_name/) - Filters a comment form field for display.
- [`comment_form_logged_in`](https://developer.wordpress.org/reference/hooks/comment_form_logged_in/) - Filters the 'logged in' message for the comment form for display.
- [`comment_id_fields`](https://developer.wordpress.org/reference/hooks/comment_id_fields/) - Filters the returned comment ID fields.
- [`comment_max_links_url`](https://developer.wordpress.org/reference/hooks/comment_max_links_url/) - Filters the number of links found in a comment.
- [`delete_site_email_content`](https://developer.wordpress.org/reference/hooks/delete_site_email_content/) - Filters the text for the email sent to the site admin when a request to delete a site in a Multisite network is submitted.
- [`deprecated_argument_trigger_error`](https://developer.wordpress.org/reference/hooks/deprecated_argument_trigger_error/) - Filters whether to trigger an error for deprecated arguments.
- [`edit_{$post_type}_per_page`](https://developer.wordpress.org/reference/hooks/edit_post_type_per_page/) - Filters the number of items per page to show for a specific 'per_page' type.
- [`enable_post_by_email_configuration`](https://developer.wordpress.org/reference/hooks/enable_post_by_email_configuration/) - Filters whether the post-by-email functionality is enabled.
- [`enable_update_services_configuration`](https://developer.wordpress.org/reference/hooks/enable_update_services_configuration/) - Filters whether to enable the Update Services section in the Writing settings screen.
- [`get_avatar_comment_types`](https://developer.wordpress.org/reference/hooks/get_avatar_comment_types/) - Filters the list of allowed comment types for retrieving avatars.
- [`get_calendar`](https://developer.wordpress.org/reference/hooks/get_calendar/) - Filters the HTML calendar output.
- [`get_shortlink`](https://developer.wordpress.org/reference/hooks/get_shortlink/) - Filters the shortlink for a post.
- [`get_the_date`](https://developer.wordpress.org/reference/hooks/get_the_date/) - Filters the date of the post.
- [`getimagesize_mimes_to_exts`](https://developer.wordpress.org/reference/hooks/getimagesize_mimes_to_exts/) - Filters the list mapping image mime types to their respective extensions.
- [`home_url`](https://developer.wordpress.org/reference/hooks/home_url/) - Filters the home URL.
- [`kses_allowed_protocols`](https://developer.wordpress.org/reference/hooks/kses_allowed_protocols/) - Filters the list of protocols allowed in HTML attributes.
- [`login_form_bottom`](https://developer.wordpress.org/reference/hooks/login_form_bottom/) - Filters content to display at the bottom of the login form.
- [`login_form_defaults`](https://developer.wordpress.org/reference/hooks/login_form_defaults/) - Filters the default login form output arguments.
- [`login_form_middle`](https://developer.wordpress.org/reference/hooks/login_form_middle/) - Filters content to display in the middle of the login form.
- [`login_form_top`](https://developer.wordpress.org/reference/hooks/login_form_top/) - Filters content to display at the top of the login form.
- [`login_redirect`](https://developer.wordpress.org/reference/hooks/login_redirect/) - Filters the login redirect URL.
- [`lostpassword_redirect`](https://developer.wordpress.org/reference/hooks/lostpassword_redirect/) - Filters the URL redirected to after submitting the lostpassword/retrievepassword form.
- [`manage_{$post_type}_posts_columns`](https://developer.wordpress.org/reference/hooks/manage_post_type_posts_columns/) - Filters the columns displayed in the Posts list table for a specific post type.
- [`manage_{$screen->id}_columns`](https://developer.wordpress.org/reference/hooks/manage_screen-id_columns/) - Filters the column headers for a list table on a specific screen.
- [`ms_site_check`](https://developer.wordpress.org/reference/hooks/ms_site_check/) - Filters checking the status of the current blog.
- [`nav_menu_attr_title`](https://developer.wordpress.org/reference/hooks/nav_menu_attr_title/) - Filters a navigation menu item's title attribute.
- [`nav_menu_css_class`](https://developer.wordpress.org/reference/hooks/nav_menu_css_class/) - Filters the CSS classes applied to a menu item's list item element.
- [`nav_menu_description`](https://developer.wordpress.org/reference/hooks/nav_menu_description/) - Filters a navigation menu item's description.
- [`nav_menu_item_id`](https://developer.wordpress.org/reference/hooks/nav_menu_item_id/) (3.0.1) - Filters the ID attribute applied to a menu item's list item element.
- [`nav_menu_meta_box_object`](https://developer.wordpress.org/reference/hooks/nav_menu_meta_box_object/) - Filters whether a menu items meta box will be added for the current object type.
- [`network_admin_url`](https://developer.wordpress.org/reference/hooks/network_admin_url/) - Filters the network admin URL.
- [`network_home_url`](https://developer.wordpress.org/reference/hooks/network_home_url/) - Filters the network home URL.
- [`network_site_url`](https://developer.wordpress.org/reference/hooks/network_site_url/) - Filters the network site URL.
- [`override_unload_textdomain`](https://developer.wordpress.org/reference/hooks/override_unload_textdomain/) - Filters whether to override the text domain unloading.
- [`paginate_links`](https://developer.wordpress.org/reference/hooks/paginate_links/) - Filters the paginated links for the given archive pages.
- [`post_type_link`](https://developer.wordpress.org/reference/hooks/post_type_link/) - Filters the permalink for a post of a custom post type.
- [`post_updated_messages`](https://developer.wordpress.org/reference/hooks/post_updated_messages/) - Filters the post updated messages.
- [`posts_search`](https://developer.wordpress.org/reference/hooks/posts_search/) - Filters the search SQL that is used in the WHERE clause of WP_Query.
- [`pre_get_shortlink`](https://developer.wordpress.org/reference/hooks/pre_get_shortlink/) - Filters whether to preempt generating a shortlink for the given post.
- [`pre_insert_term`](https://developer.wordpress.org/reference/hooks/pre_insert_term/) - Filters a term before it is sanitized and inserted into the database.
- [`pre_post_link`](https://developer.wordpress.org/reference/hooks/pre_post_link/) - Filters the permalink structure for a post before token replacement occurs.
- [`pre_set_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_set_site_transient_transient/) - Filters the value of a specific site transient before it is set.
- [`pre_set_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_set_transient_transient/) - Filters a specific transient before its value is set.
- [`privacy_on_link_text`](https://developer.wordpress.org/reference/hooks/privacy_on_link_text/) - Filters the link label for the 'Search engines discouraged' message displayed in the 'At a Glance' dashboard widget.
- [`privacy_on_link_title`](https://developer.wordpress.org/reference/hooks/privacy_on_link_title/) - Filters the link title attribute for the 'Search engines discouraged' message displayed in the 'At a Glance' dashboard widget.
- [`random_password`](https://developer.wordpress.org/reference/hooks/random_password/) - Filters the randomly-generated password.
- [`registration_redirect`](https://developer.wordpress.org/reference/hooks/registration_redirect/) - Filters the registration redirect URL.
- [`robots_txt`](https://developer.wordpress.org/reference/hooks/robots_txt/) - Filters the robots.txt output.
- [`sanitize_key`](https://developer.wordpress.org/reference/hooks/sanitize_key/) - Filters a sanitized key string.
- [`screen_settings`](https://developer.wordpress.org/reference/hooks/screen_settings/) - Filters the screen settings text displayed in the Screen Options tab.
- [`search_link`](https://developer.wordpress.org/reference/hooks/search_link/) - Filters the search permalink.
- [`shake_error_codes`](https://developer.wordpress.org/reference/hooks/shake_error_codes/) - Filters the error codes array for shaking the login form.
- [`show_advanced_plugins`](https://developer.wordpress.org/reference/hooks/show_advanced_plugins/) - Filters whether to display the advanced plugins list table.
- [`signup_another_blog_init`](https://developer.wordpress.org/reference/hooks/signup_another_blog_init/) - Filters the default site sign-up variables.
- [`signup_blog_init`](https://developer.wordpress.org/reference/hooks/signup_blog_init/) - Filters the default site creation variables for the site sign-up form.
- [`signup_user_init`](https://developer.wordpress.org/reference/hooks/signup_user_init/) - Filters the default user variables used on the user sign-up form.
- [`subdirectory_reserved_names`](https://developer.wordpress.org/reference/hooks/subdirectory_reserved_names/) - Filters reserved site names on a sub-directory Multisite installation.
- [`tables_to_repair`](https://developer.wordpress.org/reference/hooks/tables_to_repair/) - Filters additional database tables to repair.
- [`taxonomy_feed_link`](https://developer.wordpress.org/reference/hooks/taxonomy_feed_link/) - Filters the feed link for a taxonomy other than 'category' or 'post_tag'.
- [`template_include`](https://developer.wordpress.org/reference/hooks/template_include/) - Filters the path of the current template before including it.
- [`the_feed_link`](https://developer.wordpress.org/reference/hooks/the_feed_link/) - Filters the feed link anchor tag.
- [`the_shortlink`](https://developer.wordpress.org/reference/hooks/the_shortlink/) - Filters the short link anchor tag for a post.
- [`unzip_file_use_ziparchive`](https://developer.wordpress.org/reference/hooks/unzip_file_use_ziparchive/) - Filters whether to use ZipArchive to unzip archives.
- [`update_bulk_plugins_complete_actions`](https://developer.wordpress.org/reference/hooks/update_bulk_plugins_complete_actions/) - Filters the list of action links available following bulk plugin updates.
- [`update_bulk_theme_complete_actions`](https://developer.wordpress.org/reference/hooks/update_bulk_theme_complete_actions/) - Filters the list of action links available following bulk theme updates.
- [`walker_nav_menu_start_el`](https://developer.wordpress.org/reference/hooks/walker_nav_menu_start_el/) - Filters a menu item's starting output.
- [`wp_check_filetype_and_ext`](https://developer.wordpress.org/reference/hooks/wp_check_filetype_and_ext/) - Filters the "real" file type of the given file.
- [`wp_die_handler`](https://developer.wordpress.org/reference/hooks/wp_die_handler/) - Filters the callback for killing WordPress execution for all non-Ajax, non-JSON, non-XML requests.
- [`wp_edit_nav_menu_walker`](https://developer.wordpress.org/reference/hooks/wp_edit_nav_menu_walker/) - Filters the Walker class used when adding nav menu items.
- [`wp_get_nav_menu_items`](https://developer.wordpress.org/reference/hooks/wp_get_nav_menu_items/) - Filters the navigation menu items being returned.
- [`wp_get_nav_menus`](https://developer.wordpress.org/reference/hooks/wp_get_nav_menus/) - Filters the navigation menu objects being returned.
- [`wp_link_pages_args`](https://developer.wordpress.org/reference/hooks/wp_link_pages_args/) - Filters the arguments used in retrieving page links for paginated posts.
- [`wp_nav_menu`](https://developer.wordpress.org/reference/hooks/wp_nav_menu/) - Filters the HTML content for navigation menus.
- [`wp_nav_menu_args`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_args/) - Filters the arguments used to display a navigation menu.
- [`wp_nav_menu_container_allowedtags`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_container_allowedtags/) - Filters the list of HTML tags that are valid for use as menu containers.
- [`wp_nav_menu_items`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_items/) - Filters the HTML list content for navigation menus.
- [`wp_nav_menu_{$menu->slug}_items`](https://developer.wordpress.org/reference/hooks/wp_nav_menu_menu-slug_items/) - Filters the HTML list content for a specific navigation menu.
- [`wp_setup_nav_menu_item`](https://developer.wordpress.org/reference/hooks/wp_setup_nav_menu_item/) - Filters a navigation menu item object.
- [`wp_signup_location`](https://developer.wordpress.org/reference/hooks/wp_signup_location/) - Filters the Multisite sign up URL.
- [`wp_upload_bits`](https://developer.wordpress.org/reference/hooks/wp_upload_bits/) - Filters whether to treat the upload bits as an error.
- [`wpmu_active_signup`](https://developer.wordpress.org/reference/hooks/wpmu_active_signup/) - Filters the type of site sign-up.
- [`{$taxonomy}_row_actions`](https://developer.wordpress.org/reference/hooks/taxonomy_row_actions/) - Filters the action links displayed for each term in the terms list table.
- [`{$type}_upload_iframe_src`](https://developer.wordpress.org/reference/hooks/type_upload_iframe_src/) - Filters the upload iframe source URL for a specific media type.

### Changes

- [`tag_row_actions`](https://developer.wordpress.org/reference/hooks/tag_row_actions/) - Deprecated in favor of {@see '{$taxonomy}_row_actions'} filter.
- [`widget_tag_cloud_args`](https://developer.wordpress.org/reference/hooks/widget_tag_cloud_args/) - Added taxonomy drop-down.

## WordPress 2.9

### New Actions

- [`activate_plugin`](https://developer.wordpress.org/reference/hooks/activate_plugin/) - Fires before a plugin is activated.
- [`activated_plugin`](https://developer.wordpress.org/reference/hooks/activated_plugin/) - Fires after a plugin has been activated.
- [`add_option`](https://developer.wordpress.org/reference/hooks/add_option/) - Fires before an option is added.
- [`add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/add_site_option_option/) - Fires after a specific network option has been successfully added.
- [`add_term_relationship`](https://developer.wordpress.org/reference/hooks/add_term_relationship/) - Fires immediately before an object-term relationship is added.
- [`added_option`](https://developer.wordpress.org/reference/hooks/added_option/) - Fires after an option has been added.
- [`added_term_relationship`](https://developer.wordpress.org/reference/hooks/added_term_relationship/) - Fires immediately after an object-term relationship is added.
- [`added_{$meta_type}_meta`](https://developer.wordpress.org/reference/hooks/added_meta_type_meta/) - Fires immediately after meta of a specific type is added.
- [`admin_head-media-upload-popup`](https://developer.wordpress.org/reference/hooks/admin_head-media-upload-popup/) - Fires when scripts enqueued for the admin header for the legacy (pre-3.5.0) media upload popup are printed.
- [`admin_print_scripts-media-upload-popup`](https://developer.wordpress.org/reference/hooks/admin_print_scripts-media-upload-popup/) - Fires when admin scripts enqueued for the legacy (pre-3.5.0) media upload popup are printed.
- [`admin_print_styles-media-upload-popup`](https://developer.wordpress.org/reference/hooks/admin_print_styles-media-upload-popup/) - Fires when admin styles enqueued for the legacy (pre-3.5.0) media upload popup are printed.
- [`begin_fetch_post_thumbnail_html`](https://developer.wordpress.org/reference/hooks/begin_fetch_post_thumbnail_html/) - Fires before fetching the post thumbnail HTML.
- [`comment_on_password_protected`](https://developer.wordpress.org/reference/hooks/comment_on_password_protected/) - Fires when a comment is attempted on a password-protected post.
- [`comment_on_trash`](https://developer.wordpress.org/reference/hooks/comment_on_trash/) - Fires when a comment is attempted on a trashed post.
- [`core_upgrade_preamble`](https://developer.wordpress.org/reference/hooks/core_upgrade_preamble/) - Fires after the core, plugin, and theme update tables.
- [`deactivate_plugin`](https://developer.wordpress.org/reference/hooks/deactivate_plugin/) - Fires before a plugin is deactivated.
- [`deactivated_plugin`](https://developer.wordpress.org/reference/hooks/deactivated_plugin/) - Fires after a plugin is deactivated.
- [`delete_option`](https://developer.wordpress.org/reference/hooks/delete_option/) - Fires immediately before an option is deleted.
- [`delete_postmeta`](https://developer.wordpress.org/reference/hooks/delete_postmeta/) - Fires immediately before deleting metadata for a post.
- [`delete_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/delete_site_option_option/) - Fires after a specific network option has been deleted.
- [`delete_term_relationships`](https://developer.wordpress.org/reference/hooks/delete_term_relationships/) - Fires immediately before an object-term relationship is deleted.
- [`delete_term_taxonomy`](https://developer.wordpress.org/reference/hooks/delete_term_taxonomy/) - Fires immediately before a term taxonomy ID is deleted.
- [`deleted_comment`](https://developer.wordpress.org/reference/hooks/deleted_comment/) - Fires immediately after a comment is deleted from the database.
- [`deleted_option`](https://developer.wordpress.org/reference/hooks/deleted_option/) - Fires after an option has been deleted.
- [`deleted_postmeta`](https://developer.wordpress.org/reference/hooks/deleted_postmeta/) - Fires immediately after deleting metadata for a post.
- [`deleted_term_relationships`](https://developer.wordpress.org/reference/hooks/deleted_term_relationships/) - Fires immediately after an object-term relationship is deleted.
- [`deleted_term_taxonomy`](https://developer.wordpress.org/reference/hooks/deleted_term_taxonomy/) - Fires immediately after a term taxonomy ID is deleted.
- [`deleted_user`](https://developer.wordpress.org/reference/hooks/deleted_user/) - Fires immediately after a user is deleted from the site.
- [`deleted_{$meta_type}_meta`](https://developer.wordpress.org/reference/hooks/deleted_meta_type_meta/) - Fires immediately after deleting metadata of a specific type.
- [`edit_term_taxonomies`](https://developer.wordpress.org/reference/hooks/edit_term_taxonomies/) - Fires immediately before a term to delete's children are reassigned a parent.
- [`edit_term_taxonomy`](https://developer.wordpress.org/reference/hooks/edit_term_taxonomy/) - Fires immediate before a term-taxonomy relationship is updated.
- [`edit_terms`](https://developer.wordpress.org/reference/hooks/edit_terms/) - Fires immediately before the given terms are edited.
- [`edited_term_taxonomies`](https://developer.wordpress.org/reference/hooks/edited_term_taxonomies/) - Fires immediately after a term to delete's children are reassigned a parent.
- [`edited_term_taxonomy`](https://developer.wordpress.org/reference/hooks/edited_term_taxonomy/) - Fires immediately after a term-taxonomy relationship is updated.
- [`edited_terms`](https://developer.wordpress.org/reference/hooks/edited_terms/) - Fires immediately after a term is updated in the database, but before its term-taxonomy relationship is updated.
- [`end_fetch_post_thumbnail_html`](https://developer.wordpress.org/reference/hooks/end_fetch_post_thumbnail_html/) - Fires after fetching the post thumbnail HTML.
- [`load_textdomain`](https://developer.wordpress.org/reference/hooks/load_textdomain/) - Fires before the MO translation file is loaded.
- [`post_submitbox_misc_actions`](https://developer.wordpress.org/reference/hooks/post_submitbox_misc_actions/) - Fires after the post time/date setting in the Publish meta box.
- [`set_user_role`](https://developer.wordpress.org/reference/hooks/set_user_role/) - Fires after the user's role has changed.
- [`spam_comment`](https://developer.wordpress.org/reference/hooks/spam_comment/) - Fires immediately before a comment is marked as Spam.
- [`spammed_comment`](https://developer.wordpress.org/reference/hooks/spammed_comment/) - Fires immediately after a comment is marked as Spam.
- [`trash_comment`](https://developer.wordpress.org/reference/hooks/trash_comment/) - Fires immediately before a comment is sent to the Trash.
- [`trash_post_comments`](https://developer.wordpress.org/reference/hooks/trash_post_comments/) - Fires before comments are sent to the Trash.
- [`trashed_comment`](https://developer.wordpress.org/reference/hooks/trashed_comment/) - Fires immediately after a comment is sent to Trash.
- [`trashed_post`](https://developer.wordpress.org/reference/hooks/trashed_post/) - Fires after a post is sent to the Trash.
- [`trashed_post_comments`](https://developer.wordpress.org/reference/hooks/trashed_post_comments/) - Fires after comments are sent to the Trash.
- [`unspam_comment`](https://developer.wordpress.org/reference/hooks/unspam_comment/) - Fires immediately before a comment is unmarked as Spam.
- [`unspammed_comment`](https://developer.wordpress.org/reference/hooks/unspammed_comment/) - Fires immediately after a comment is unmarked as Spam.
- [`untrash_comment`](https://developer.wordpress.org/reference/hooks/untrash_comment/) - Fires immediately before a comment is restored from the Trash.
- [`untrash_post`](https://developer.wordpress.org/reference/hooks/untrash_post/) - Fires before a post is restored from the Trash.
- [`untrash_post_comments`](https://developer.wordpress.org/reference/hooks/untrash_post_comments/) - Fires before comments are restored for a post from the Trash.
- [`untrashed_comment`](https://developer.wordpress.org/reference/hooks/untrashed_comment/) - Fires immediately after a comment is restored from the Trash.
- [`untrashed_post`](https://developer.wordpress.org/reference/hooks/untrashed_post/) - Fires after a post is restored from the Trash.
- [`untrashed_post_comments`](https://developer.wordpress.org/reference/hooks/untrashed_post_comments/) - Fires after comments are restored for a post from the Trash.
- [`update_option`](https://developer.wordpress.org/reference/hooks/update_option/) - Fires immediately before an option value is updated.
- [`update_postmeta`](https://developer.wordpress.org/reference/hooks/update_postmeta/) - Fires immediately before updating a post's metadata.
- [`update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/update_site_option_option/) - Fires after the value of a specific network option has been successfully updated.
- [`update_{$meta_type}_meta`](https://developer.wordpress.org/reference/hooks/update_meta_type_meta/) - Fires immediately before updating metadata of a specific type.
- [`updated_option`](https://developer.wordpress.org/reference/hooks/updated_option/) - Fires after the value of an option has been successfully updated.
- [`updated_postmeta`](https://developer.wordpress.org/reference/hooks/updated_postmeta/) - Fires immediately after updating a post's metadata.
- [`updated_{$meta_type}_meta`](https://developer.wordpress.org/reference/hooks/updated_meta_type_meta/) - Fires immediately after updating metadata of a specific type.
- [`wp-mail.php`](https://developer.wordpress.org/reference/hooks/wp-mail.php/) - Fires to allow a plugin to do a complete takeover of Post by Email.

### New Filters

- [`_wp_relative_upload_path`](https://developer.wordpress.org/reference/hooks/_wp_relative_upload_path/) - Filters the relative path to an uploaded file.
- [`admin_post_thumbnail_html`](https://developer.wordpress.org/reference/hooks/admin_post_thumbnail_html/) - Filters the admin post thumbnail HTML markup to return.
- [`auth_redirect_scheme`](https://developer.wordpress.org/reference/hooks/auth_redirect_scheme/) - Filters the authentication redirect scheme.
- [`edit_user_{$field}`](https://developer.wordpress.org/reference/hooks/edit_user_field/) - Filters a user field value in the 'edit' context.
- [`embed_cache_oembed_types`](https://developer.wordpress.org/reference/hooks/embed_cache_oembed_types/) - Filters the array of post types to cache oEmbed results for.
- [`embed_defaults`](https://developer.wordpress.org/reference/hooks/embed_defaults/) - Filters the default array of embed dimensions.
- [`embed_handler_html`](https://developer.wordpress.org/reference/hooks/embed_handler_html/) - Filters the returned embed HTML.
- [`embed_maybe_make_link`](https://developer.wordpress.org/reference/hooks/embed_maybe_make_link/) - Filters the returned, maybe-linked embed URL.
- [`embed_oembed_discover`](https://developer.wordpress.org/reference/hooks/embed_oembed_discover/) - Filters whether to inspect the given URL for discoverable link tags.
- [`embed_oembed_html`](https://developer.wordpress.org/reference/hooks/embed_oembed_html/) - Filters the cached oEmbed HTML.
- [`excerpt_more`](https://developer.wordpress.org/reference/hooks/excerpt_more/) - Filters the string in the "more" link displayed after a trimmed excerpt.
- [`extra_{$context}_headers`](https://developer.wordpress.org/reference/hooks/extra_context_headers/) - Filters extra file headers by context.
- [`fs_ftp_connection_types`](https://developer.wordpress.org/reference/hooks/fs_ftp_connection_types/) - Filters the connection types to output to the filesystem credentials form.
- [`get_delete_post_link`](https://developer.wordpress.org/reference/hooks/get_delete_post_link/) - Filters the post delete link.
- [`get_sample_permalink_html`](https://developer.wordpress.org/reference/hooks/get_sample_permalink_html/) - Filters the sample permalink HTML markup.
- [`http_response`](https://developer.wordpress.org/reference/hooks/http_response/) - Filters a successful HTTP API response immediately before the response is returned.
- [`intermediate_image_sizes_advanced`](https://developer.wordpress.org/reference/hooks/intermediate_image_sizes_advanced/) - Filters the image sizes automatically generated when uploading an image.
- [`load_default_embeds`](https://developer.wordpress.org/reference/hooks/load_default_embeds/) - Filters whether to load the default embed handlers.
- [`load_image_to_edit`](https://developer.wordpress.org/reference/hooks/load_image_to_edit/) - Filters the current image being loaded for editing.
- [`load_image_to_edit_path`](https://developer.wordpress.org/reference/hooks/load_image_to_edit_path/) - Filters the returned path or URL of the current image.
- [`load_textdomain_mofile`](https://developer.wordpress.org/reference/hooks/load_textdomain_mofile/) - Filters MO file path for loading translations for a specific text domain.
- [`oembed_dataparse`](https://developer.wordpress.org/reference/hooks/oembed_dataparse/) - Filters the returned oEmbed HTML.
- [`oembed_fetch_url`](https://developer.wordpress.org/reference/hooks/oembed_fetch_url/) - Filters the oEmbed URL to be fetched.
- [`oembed_linktypes`](https://developer.wordpress.org/reference/hooks/oembed_linktypes/) - Filters the link types that contain oEmbed provider URLs.
- [`oembed_providers`](https://developer.wordpress.org/reference/hooks/oembed_providers/) - Filters the list of sanctioned oEmbed providers.
- [`oembed_result`](https://developer.wordpress.org/reference/hooks/oembed_result/) - Filters the HTML returned by the oEmbed provider.
- [`override_load_textdomain`](https://developer.wordpress.org/reference/hooks/override_load_textdomain/) - Filters whether to override the .mo file loading.
- [`pingback_useragent`](https://developer.wordpress.org/reference/hooks/pingback_useragent/) - Filters the user agent sent when pinging-back a URL.
- [`post_thumbnail_html`](https://developer.wordpress.org/reference/hooks/post_thumbnail_html/) - Filters the post thumbnail HTML.
- [`post_thumbnail_size`](https://developer.wordpress.org/reference/hooks/post_thumbnail_size/) - Filters the post thumbnail size.
- [`pre_add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_add_site_option_option/) - Filters the value of a specific network option before it is added.
- [`pre_http_request`](https://developer.wordpress.org/reference/hooks/pre_http_request/) - Filters the preemptive return value of an HTTP request.
- [`pre_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_site_option_option/) - Filters the value of an existing network option before it is retrieved.
- [`pre_site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_site_transient_transient/) - Filters the value of an existing site transient before it is retrieved.
- [`pre_update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_update_site_option_option/) - Filters a specific network option before its value is updated.
- [`pre_user_{$field}`](https://developer.wordpress.org/reference/hooks/pre_user_field/) - Filters the value of a user field in the 'db' context.
- [`redirect_post_location`](https://developer.wordpress.org/reference/hooks/redirect_post_location/) - Filters the post redirect destination URL.
- [`sanitize_text_field`](https://developer.wordpress.org/reference/hooks/sanitize_text_field/) - Filters a sanitized text field string.
- [`site_option_{$option}`](https://developer.wordpress.org/reference/hooks/site_option_option/) - Filters the value of an existing network option.
- [`site_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/site_transient_transient/) - Filters the value of an existing site transient.
- [`smilies_src`](https://developer.wordpress.org/reference/hooks/smilies_src/) - Filters the Smiley image URL before it's used in the image element.
- [`the_author`](https://developer.wordpress.org/reference/hooks/the_author/) - Filters the display name of the current post's author.
- [`the_author_posts_link`](https://developer.wordpress.org/reference/hooks/the_author_posts_link/) - Filters the link to the author page of the author of the current post.
- [`the_content_feed`](https://developer.wordpress.org/reference/hooks/the_content_feed/) - Filters the post content for use in feeds.
- [`the_terms`](https://developer.wordpress.org/reference/hooks/the_terms/) - Filters the list of terms to display.
- [`upload_per_page`](https://developer.wordpress.org/reference/hooks/upload_per_page/) - Filters the number of items to list per page when listing media items.
- [`user_contactmethods`](https://developer.wordpress.org/reference/hooks/user_contactmethods/) - Filters the user contact methods.
- [`user_{$field}`](https://developer.wordpress.org/reference/hooks/user_field/) - Filters the value of a user field in a standard context.
- [`user_{$name}_label`](https://developer.wordpress.org/reference/hooks/user_name_label/) - Filters a user contactmethod label.
- [`{$action}_prefilter`](https://developer.wordpress.org/reference/hooks/action_prefilter/) - Filters the data for a file before it is uploaded to WordPress.
- [`{$option}`](https://developer.wordpress.org/reference/hooks/option/) - Filters the number of items to be displayed on each page of the list table.

### Changes

- [`{$action}_prefilter`](https://developer.wordpress.org/reference/hooks/action_prefilter/) - as 'wp_handle_upload_prefilter'.
- [`add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/add_site_option_option/) - As <code>add_site_option_{$key}</code>.
- [`delete_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/delete_site_option_option/) - As <code>delete_site_option_{$key}</code>.
- [`pre_add_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_add_site_option_option/) - As <code>pre_add_site_option_{$key}</code>.
- [`pre_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_site_option_option/) - As <code>pre_site_option_{$key}</code>.
- [`pre_update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_update_site_option_option/) - As 'pre_update_site<em>option</em>' . $key
- [`site_option_{$option}`](https://developer.wordpress.org/reference/hooks/site_option_option/) - As <code>site_option_{$key}</code>.
- [`update_site_option_{$option}`](https://developer.wordpress.org/reference/hooks/update_site_option_option/) - As "update_site<em>option</em>{$key}"

## WordPress 2.8

### New Actions

- [`admin_enqueue_scripts`](https://developer.wordpress.org/reference/hooks/admin_enqueue_scripts/) - Fires when enqueuing scripts for all admin pages.
- [`admin_footer-{$hook_suffix}`](https://developer.wordpress.org/reference/hooks/admin_footer-hook_suffix/) - Prints scripts or data after the default footer scripts.
- [`admin_print_footer_scripts`](https://developer.wordpress.org/reference/hooks/admin_print_footer_scripts/) - Prints any scripts and data queued for the footer.
- [`after_db_upgrade`](https://developer.wordpress.org/reference/hooks/after_db_upgrade/) - Fires on the next page load after a successful DB upgrade.
- [`atom_comments_ns`](https://developer.wordpress.org/reference/hooks/atom_comments_ns/) - Fires inside the feed tag in the Atom comment feed.
- [`auth_redirect`](https://developer.wordpress.org/reference/hooks/auth_redirect/) - Fires before the authentication redirect.
- [`comments_atom_head`](https://developer.wordpress.org/reference/hooks/comments_atom_head/) - Fires at the end of the Atom comment feed header.
- [`http_api_curl`](https://developer.wordpress.org/reference/hooks/http_api_curl/) - Fires before the cURL request is executed.
- [`http_api_debug`](https://developer.wordpress.org/reference/hooks/http_api_debug/) - Fires after an HTTP API response is received and before the response is returned.
- [`in_plugin_update_message-{$file}`](https://developer.wordpress.org/reference/hooks/in_plugin_update_message-file/) - Fires at the end of the update message container in each row of the plugins list table.
- [`in_widget_form`](https://developer.wordpress.org/reference/hooks/in_widget_form/) - Fires at the end of the widget control form.
- [`install_themes_pre_{$tab}`](https://developer.wordpress.org/reference/hooks/install_themes_pre_tab/) - Fires before each of the tabs are rendered on the Install Themes page.
- [`install_themes_table_header`](https://developer.wordpress.org/reference/hooks/install_themes_table_header/) - Fires in the Install Themes list table header.
- [`install_themes_{$tab}`](https://developer.wordpress.org/reference/hooks/install_themes_tab/) - Fires at the top of each of the tabs on the Install Themes page.
- [`load-widgets.php`](https://developer.wordpress.org/reference/hooks/load-widgets.php/) - Fires early when editing the widgets displayed in sidebars.
- [`login_form_{$action}`](https://developer.wordpress.org/reference/hooks/login_form_action/) - Fires before a specified login form action.
- [`manage_comments_custom_column`](https://developer.wordpress.org/reference/hooks/manage_comments_custom_column/) - Fires when the default column output is displayed for a single row.
- [`muplugins_loaded`](https://developer.wordpress.org/reference/hooks/muplugins_loaded/) - Fires once all must-use and network-activated plugins have loaded.
- [`permalink_structure_changed`](https://developer.wordpress.org/reference/hooks/permalink_structure_changed/) - Fires after the permalink structure is updated.
- [`pre_comment_on_post`](https://developer.wordpress.org/reference/hooks/pre_comment_on_post/) - Fires before a comment is posted.
- [`rss2_comments_ns`](https://developer.wordpress.org/reference/hooks/rss2_comments_ns/) - Fires at the end of the RSS root to add namespaces.
- [`set_object_terms`](https://developer.wordpress.org/reference/hooks/set_object_terms/) - Fires after an object's terms have been set.
- [`the_post`](https://developer.wordpress.org/reference/hooks/the_post/) - Fires once the post data has been set up.
- [`tool_box`](https://developer.wordpress.org/reference/hooks/tool_box/) - Fires at the end of the Tools Administration screen.
- [`update-custom_{$action}`](https://developer.wordpress.org/reference/hooks/update-custom_action/) - Fires when a custom plugin or theme update request is received.
- [`user_profile_update_errors`](https://developer.wordpress.org/reference/hooks/user_profile_update_errors/) - Fires before user profile update errors are returned.
- [`widgets.php`](https://developer.wordpress.org/reference/hooks/widgets.php/) - Fires early when editing the widgets displayed in sidebars.
- [`wp_ajax_nopriv_{$action}`](https://developer.wordpress.org/reference/hooks/wp_ajax_nopriv_action/) - Fires non-authenticated Ajax actions for logged-out users.
- [`wp_enqueue_scripts`](https://developer.wordpress.org/reference/hooks/wp_enqueue_scripts/) - Fires when scripts and styles are enqueued.
- [`wp_insert_comment`](https://developer.wordpress.org/reference/hooks/wp_insert_comment/) - Fires immediately after a comment is inserted into the database.
- [`wp_print_footer_scripts`](https://developer.wordpress.org/reference/hooks/wp_print_footer_scripts/) - Fires when footer scripts are printed.

### New Filters

- [`additional_capabilities_display`](https://developer.wordpress.org/reference/hooks/additional_capabilities_display/) - Filters whether to display additional capabilities for the user.
- [`admin_footer_text`](https://developer.wordpress.org/reference/hooks/admin_footer_text/) - Filters the "Thank you" text displayed in the admin footer.
- [`admin_url`](https://developer.wordpress.org/reference/hooks/admin_url/) - Filters the admin area URL.
- [`auth_cookie_expiration`](https://developer.wordpress.org/reference/hooks/auth_cookie_expiration/) - Filters the duration of the authentication cookie expiration period.
- [`authenticate`](https://developer.wordpress.org/reference/hooks/authenticate/) - Filters whether a set of user login credentials are valid.
- [`block_local_requests`](https://developer.wordpress.org/reference/hooks/block_local_requests/) - Filters whether to block local HTTP API requests.
- [`body_class`](https://developer.wordpress.org/reference/hooks/body_class/) - Filters the list of CSS body class names for the current post or page.
- [`comment_cookie_lifetime`](https://developer.wordpress.org/reference/hooks/comment_cookie_lifetime/) - Filters the lifetime of the comment cookie in seconds.
- [`comment_feed_limits`](https://developer.wordpress.org/reference/hooks/comment_feed_limits/) - Filters the LIMIT clause of the comments feed query before sending.
- [`comment_feed_orderby`](https://developer.wordpress.org/reference/hooks/comment_feed_orderby/) - Filters the ORDER BY clause of the comments feed query before sending.
- [`comment_moderation_headers`](https://developer.wordpress.org/reference/hooks/comment_moderation_headers/) - Filters the comment moderation email headers.
- [`content_url`](https://developer.wordpress.org/reference/hooks/content_url/) - Filters the URL to the content directory.
- [`core_version_check_locale`](https://developer.wordpress.org/reference/hooks/core_version_check_locale/) - Filters the locale requested for WordPress core translations.
- [`custom_menu_order`](https://developer.wordpress.org/reference/hooks/custom_menu_order/) - Filters whether to enable custom ordering of the administration menu.
- [`date_i18n`](https://developer.wordpress.org/reference/hooks/date_i18n/) - Filters the date formatted based on the locale.
- [`display_post_states`](https://developer.wordpress.org/reference/hooks/display_post_states/) - Filters the default post display states used in the posts list table.
- [`documentation_ignore_functions`](https://developer.wordpress.org/reference/hooks/documentation_ignore_functions/) - Filters the list of functions and classes to be ignored from the documentation lookup.
- [`edit_categories_per_page`](https://developer.wordpress.org/reference/hooks/edit_categories_per_page/) - Filters the number of terms displayed per page for the Categories list table.
- [`edit_posts_per_page`](https://developer.wordpress.org/reference/hooks/edit_posts_per_page/) - Filters the number of posts displayed per page when specifically listing "posts".
- [`edit_tags_per_page`](https://developer.wordpress.org/reference/hooks/edit_tags_per_page/) - Filters the number of terms displayed per page for the Tags list table.
- [`editable_extensions`](https://developer.wordpress.org/reference/hooks/editable_extensions/) - Filters the list of file types allowed for editing in the plugin file editor.
- [`editable_roles`](https://developer.wordpress.org/reference/hooks/editable_roles/) - Filters the list of editable roles.
- [`esc_html`](https://developer.wordpress.org/reference/hooks/esc_html/) - Filters a string cleaned and escaped for output in HTML.
- [`feed_content_type`](https://developer.wordpress.org/reference/hooks/feed_content_type/) - Filters the content type for a specific feed type.
- [`get_comment_link`](https://developer.wordpress.org/reference/hooks/get_comment_link/) - Filters the returned single comment permalink.
- [`get_post_modified_time`](https://developer.wordpress.org/reference/hooks/get_post_modified_time/) - Filters the localized time a post was last modified.
- [`get_terms_fields`](https://developer.wordpress.org/reference/hooks/get_terms_fields/) - Filters the fields to select in the terms query.
- [`get_terms_orderby`](https://developer.wordpress.org/reference/hooks/get_terms_orderby/) - Filters the ORDERBY clause of the terms query.
- [`get_the_author_{$field}`](https://developer.wordpress.org/reference/hooks/get_the_author_field/) - Filters the value of the requested user metadata.
- [`gettext_with_context`](https://developer.wordpress.org/reference/hooks/gettext_with_context/) - Filters text with its translation based on context information.
- [`https_local_ssl_verify`](https://developer.wordpress.org/reference/hooks/https_local_ssl_verify/) - Filters whether SSL should be verified for local HTTP API requests.
- [`https_ssl_verify`](https://developer.wordpress.org/reference/hooks/https_ssl_verify/) - Filters whether SSL should be verified for non-local requests.
- [`iis7_supports_permalinks`](https://developer.wordpress.org/reference/hooks/iis7_supports_permalinks/) - Filters whether IIS 7+ supports pretty permalinks.
- [`iis7_url_rewrite_rules`](https://developer.wordpress.org/reference/hooks/iis7_url_rewrite_rules/) - Filters the list of rewrite rules formatted for output to a web.config.
- [`image_send_to_editor_url`](https://developer.wordpress.org/reference/hooks/image_send_to_editor_url/) - Filters the image URL sent to the editor.
- [`includes_url`](https://developer.wordpress.org/reference/hooks/includes_url/) - Filters the URL to the includes directory.
- [`install_theme_complete_actions`](https://developer.wordpress.org/reference/hooks/install_theme_complete_actions/) - Filters the list of action links available following a single theme installation.
- [`install_themes_nonmenu_tabs`](https://developer.wordpress.org/reference/hooks/install_themes_nonmenu_tabs/) - Filters tabs not associated with a menu item on the Install Themes screen.
- [`install_themes_tabs`](https://developer.wordpress.org/reference/hooks/install_themes_tabs/) - Filters the tabs shown on the Add Themes screen.
- [`is_email`](https://developer.wordpress.org/reference/hooks/is_email/) - Filters whether an email address is valid.
- [`load_default_widgets`](https://developer.wordpress.org/reference/hooks/load_default_widgets/) - Filters whether to load the Widgets library.
- [`login_url`](https://developer.wordpress.org/reference/hooks/login_url/) - Filters the login URL.
- [`logout_url`](https://developer.wordpress.org/reference/hooks/logout_url/) - Filters the logout URL.
- [`lostpassword_url`](https://developer.wordpress.org/reference/hooks/lostpassword_url/) - Filters the Lost Password URL.
- [`manage_users_custom_column`](https://developer.wordpress.org/reference/hooks/manage_users_custom_column/) - Filters the display output of custom columns in the Users list table.
- [`manage_{$this->screen->taxonomy}_custom_column`](https://developer.wordpress.org/reference/hooks/manage_this-screen-taxonomy_custom_column/) - Filters the displayed columns in the terms list table.
- [`map_meta_cap`](https://developer.wordpress.org/reference/hooks/map_meta_cap/) - Filters the primitive capabilities required of the given user to satisfy the capability being checked.
- [`media_row_actions`](https://developer.wordpress.org/reference/hooks/media_row_actions/) - Filters the action links for each attachment in the Media list table.
- [`menu_order`](https://developer.wordpress.org/reference/hooks/menu_order/) - Filters the order of administration menu items.
- [`ngettext_with_context`](https://developer.wordpress.org/reference/hooks/ngettext_with_context/) - Filters the singular or plural form of a string with gettext context.
- [`no_texturize_shortcodes`](https://developer.wordpress.org/reference/hooks/no_texturize_shortcodes/) - Filters the list of shortcodes not to texturize.
- [`no_texturize_tags`](https://developer.wordpress.org/reference/hooks/no_texturize_tags/) - Filters the list of HTML elements not to texturize.
- [`nocache_headers`](https://developer.wordpress.org/reference/hooks/nocache_headers/) - Filters the cache-controlling HTTP headers that are used to prevent caching.
- [`number_format_i18n`](https://developer.wordpress.org/reference/hooks/number_format_i18n/) - Filters the number formatted based on the locale.
- [`page_css_class`](https://developer.wordpress.org/reference/hooks/page_css_class/) - Filters the list of CSS classes to include with each page item in the list.
- [`page_row_actions`](https://developer.wordpress.org/reference/hooks/page_row_actions/) - Filters the array of row action links on the Pages list table.
- [`plugin_row_meta`](https://developer.wordpress.org/reference/hooks/plugin_row_meta/) - Filters the array of row meta for each plugin in the Plugins list table.
- [`plugins_url`](https://developer.wordpress.org/reference/hooks/plugins_url/) - Filters the URL to the plugins directory.
- [`post_comments_feed_link_html`](https://developer.wordpress.org/reference/hooks/post_comments_feed_link_html/) - Filters the post comment feed link anchor tag.
- [`post_row_actions`](https://developer.wordpress.org/reference/hooks/post_row_actions/) - Filters the array of row action links on the Posts list table.
- [`pre_transient_{$transient}`](https://developer.wordpress.org/reference/hooks/pre_transient_transient/) - Filters the value of an existing transient before it is retrieved.
- [`print_admin_styles`](https://developer.wordpress.org/reference/hooks/print_admin_styles/) - Filters whether to print the admin styles.
- [`print_footer_scripts`](https://developer.wordpress.org/reference/hooks/print_footer_scripts/) - Filters whether to print the footer scripts.
- [`print_head_scripts`](https://developer.wordpress.org/reference/hooks/print_head_scripts/) - Filters whether to print the head scripts.
- [`private_title_format`](https://developer.wordpress.org/reference/hooks/private_title_format/) - Filters the text prepended to the post title of private posts.
- [`protected_title_format`](https://developer.wordpress.org/reference/hooks/protected_title_format/) - Filters the text prepended to the post title for protected posts.
- [`retrieve_password_message`](https://developer.wordpress.org/reference/hooks/retrieve_password_message/) - Filters the message body of the password reset mail.
- [`retrieve_password_title`](https://developer.wordpress.org/reference/hooks/retrieve_password_title/) - Filters the subject of the password reset email.
- [`safe_style_css`](https://developer.wordpress.org/reference/hooks/safe_style_css/) (2.8.1) - Filters the list of allowed CSS attributes.
- [`sanitize_email`](https://developer.wordpress.org/reference/hooks/sanitize_email/) - Filters a sanitized email address.
- [`sanitize_file_name`](https://developer.wordpress.org/reference/hooks/sanitize_file_name/) - Filters a sanitized filename string.
- [`sanitize_file_name_chars`](https://developer.wordpress.org/reference/hooks/sanitize_file_name_chars/) - Filters the list of characters to remove from a filename.
- [`sanitize_html_class`](https://developer.wordpress.org/reference/hooks/sanitize_html_class/) - Filters a sanitized HTML class string.
- [`screen_layout_columns`](https://developer.wordpress.org/reference/hooks/screen_layout_columns/) - Filters the array of screen layout columns.
- [`set-screen-option`](https://developer.wordpress.org/reference/hooks/set-screen-option/) - Filters a screen option value before it is set.
- [`tag_cloud_sort`](https://developer.wordpress.org/reference/hooks/tag_cloud_sort/) - Filters how the items in a tag cloud are sorted.
- [`tag_escape`](https://developer.wordpress.org/reference/hooks/tag_escape/) - Filters a string cleaned and escaped for output as an HTML tag.
- [`tag_row_actions`](https://developer.wordpress.org/reference/hooks/tag_row_actions/) - Filters the action links displayed for each term in the Tags list table.
- [`terms_to_edit`](https://developer.wordpress.org/reference/hooks/terms_to_edit/) - Filters the comma-separated list of terms available to edit.
- [`the_author_{$field}`](https://developer.wordpress.org/reference/hooks/the_author_field/) - Filters the value of the requested user metadata.
- [`the_content_more_link`](https://developer.wordpress.org/reference/hooks/the_content_more_link/) - Filters the Read More link text.
- [`the_modified_author`](https://developer.wordpress.org/reference/hooks/the_modified_author/) - Filters the display name of the author who last edited the current post.
- [`theme_action_links`](https://developer.wordpress.org/reference/hooks/theme_action_links/) - Filters the action links displayed for each theme in the Multisite themes list table.
- [`themes_api`](https://developer.wordpress.org/reference/hooks/themes_api/) - Filters whether to override the WordPress.org Themes API.
- [`themes_api_args`](https://developer.wordpress.org/reference/hooks/themes_api_args/) - Filters arguments used to query for installer pages from the WordPress.org Themes API.
- [`themes_api_result`](https://developer.wordpress.org/reference/hooks/themes_api_result/) - Filters the returned WordPress.org Themes API response.
- [`transient_{$transient}`](https://developer.wordpress.org/reference/hooks/transient_transient/) - Filters an existing transient's value.
- [`update_theme_complete_actions`](https://developer.wordpress.org/reference/hooks/update_theme_complete_actions/) - Filters the list of action links available following a single theme update.
- [`upgrader_clear_destination`](https://developer.wordpress.org/reference/hooks/upgrader_clear_destination/) - Filters whether the upgrader cleared the destination.
- [`upgrader_post_install`](https://developer.wordpress.org/reference/hooks/upgrader_post_install/) - Filters the installation response after the installation has finished.
- [`upgrader_pre_install`](https://developer.wordpress.org/reference/hooks/upgrader_pre_install/) - Filters the installation response before the installation has started.
- [`upgrader_source_selection`](https://developer.wordpress.org/reference/hooks/upgrader_source_selection/) - Filters the source file location for the upgrade package.
- [`user_row_actions`](https://developer.wordpress.org/reference/hooks/user_row_actions/) - Filters the action links displayed under each user in the Users list table.
- [`widget_archives_args`](https://developer.wordpress.org/reference/hooks/widget_archives_args/) - Filters the arguments for the Archives widget.
- [`widget_archives_dropdown_args`](https://developer.wordpress.org/reference/hooks/widget_archives_dropdown_args/) - Filters the arguments for the Archives widget drop-down.
- [`widget_categories_args`](https://developer.wordpress.org/reference/hooks/widget_categories_args/) - Filters the arguments for the Categories widget.
- [`widget_categories_dropdown_args`](https://developer.wordpress.org/reference/hooks/widget_categories_dropdown_args/) - Filters the arguments for the Categories widget drop-down.
- [`widget_display_callback`](https://developer.wordpress.org/reference/hooks/widget_display_callback/) - Filters the settings for a particular widget instance.
- [`widget_form_callback`](https://developer.wordpress.org/reference/hooks/widget_form_callback/) - Filters the widget instance's settings before displaying the control form.
- [`widget_pages_args`](https://developer.wordpress.org/reference/hooks/widget_pages_args/) - Filters the arguments for the Pages widget.
- [`widget_tag_cloud_args`](https://developer.wordpress.org/reference/hooks/widget_tag_cloud_args/) - Filters the taxonomy used in the Tag Cloud widget.
- [`widget_update_callback`](https://developer.wordpress.org/reference/hooks/widget_update_callback/) - Filters a widget's settings before saving.
- [`wp_feed_cache_transient_lifetime`](https://developer.wordpress.org/reference/hooks/wp_feed_cache_transient_lifetime/) - Filters the transient lifetime of the feed cache.
- [`wp_get_attachment_image_attributes`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_image_attributes/) - Filters the list of attachment image attributes.
- [`wp_get_object_terms`](https://developer.wordpress.org/reference/hooks/wp_get_object_terms/) - Filters the terms for a given object or objects.
- [`wp_headers`](https://developer.wordpress.org/reference/hooks/wp_headers/) - Filters the HTTP headers before they're sent to the browser.
- [`wp_mail_original_content`](https://developer.wordpress.org/reference/hooks/wp_mail_original_content/) - Filters the original content of the email.
- [`wp_trim_excerpt`](https://developer.wordpress.org/reference/hooks/wp_trim_excerpt/) - Filters the trimmed excerpt string.
- [`{$adjacent}_post_rel_link`](https://developer.wordpress.org/reference/hooks/adjacent_post_rel_link/) - Filters the adjacent post relational link.

### Changes

- [`get_footer`](https://developer.wordpress.org/reference/hooks/get_footer/) - The <code>$name</code> parameter was added.
- [`get_header`](https://developer.wordpress.org/reference/hooks/get_header/) - The <code>$name</code> parameter was added.
- [`get_sidebar`](https://developer.wordpress.org/reference/hooks/get_sidebar/) - The <code>$name</code> parameter was added.
- [`show_password_fields`](https://developer.wordpress.org/reference/hooks/show_password_fields/) - Added the <code>$profile_user</code> parameter.

## WordPress 2.7

### New Actions

- [`after_plugin_row_{$plugin_file}`](https://developer.wordpress.org/reference/hooks/after_plugin_row_plugin_file/) - Fires after each specific row in the Plugins list table.
- [`auth_cookie_bad_hash`](https://developer.wordpress.org/reference/hooks/auth_cookie_bad_hash/) - Fires if a bad authentication cookie hash is encountered.
- [`auth_cookie_bad_username`](https://developer.wordpress.org/reference/hooks/auth_cookie_bad_username/) - Fires if a bad username is entered in the user authentication process.
- [`auth_cookie_expired`](https://developer.wordpress.org/reference/hooks/auth_cookie_expired/) - Fires once an authentication cookie has expired.
- [`auth_cookie_malformed`](https://developer.wordpress.org/reference/hooks/auth_cookie_malformed/) - Fires if an authentication cookie is malformed.
- [`auth_cookie_valid`](https://developer.wordpress.org/reference/hooks/auth_cookie_valid/) - Fires once an authentication cookie has been validated.
- [`bulk_edit_custom_box`](https://developer.wordpress.org/reference/hooks/bulk_edit_custom_box/) - Fires once for each column in Bulk Edit mode.
- [`clear_auth_cookie`](https://developer.wordpress.org/reference/hooks/clear_auth_cookie/) - Fires just before the authentication cookies are cleared.
- [`comment_{$new_status}_{$comment->comment_type}`](https://developer.wordpress.org/reference/hooks/comment_new_status_comment-comment_type/) - Fires when the status of a specific comment type is in transition.
- [`comment_{$old_status}_to_{$new_status}`](https://developer.wordpress.org/reference/hooks/comment_old_status_to_new_status/) - Fires when the comment status is in transition from one specific status to another.
- [`edit_user_profile_update`](https://developer.wordpress.org/reference/hooks/edit_user_profile_update/) - Fires before the page loads on the 'Edit User' screen.
- [`install_plugins_pre_{$tab}`](https://developer.wordpress.org/reference/hooks/install_plugins_pre_tab/) - Fires before each tab on the Install Plugins screen is loaded.
- [`install_plugins_table_header`](https://developer.wordpress.org/reference/hooks/install_plugins_table_header/) - Fires before the Plugin Install table header pagination is displayed.
- [`install_plugins_{$tab}`](https://developer.wordpress.org/reference/hooks/install_plugins_tab/) - Fires after the plugins list table in each tab of the Install Plugins screen.
- [`personal_options`](https://developer.wordpress.org/reference/hooks/personal_options/) - Fires at the end of the 'Personal Options' settings table on the user editing screen.
- [`post_submitbox_start`](https://developer.wordpress.org/reference/hooks/post_submitbox_start/) - Fires at the beginning of the publishing actions section of the Publish meta box.
- [`pre_get_search_form`](https://developer.wordpress.org/reference/hooks/pre_get_search_form/) - Fires before the search form is retrieved, at the start of get_search_form().
- [`quick_edit_custom_box`](https://developer.wordpress.org/reference/hooks/quick_edit_custom_box/) - Fires once for each column in Quick Edit mode.
- [`transition_comment_status`](https://developer.wordpress.org/reference/hooks/transition_comment_status/) - Fires when the comment status is in transition.
- [`uninstall_{$file}`](https://developer.wordpress.org/reference/hooks/uninstall_file/) - Fires in uninstall_plugin() once the plugin has been uninstalled.

### New Filters

- [`add_menu_classes`](https://developer.wordpress.org/reference/hooks/add_menu_classes/) - Filters administration menu array with classes added for top-level items.
- [`admin_comment_types_dropdown`](https://developer.wordpress.org/reference/hooks/admin_comment_types_dropdown/) - Filters the comment types shown in the drop-down menu on the Comments list table.
- [`allow_password_reset`](https://developer.wordpress.org/reference/hooks/allow_password_reset/) - Filters whether to allow a password to be reset.
- [`cancel_comment_reply_link`](https://developer.wordpress.org/reference/hooks/cancel_comment_reply_link/) - Filters the cancel comment reply link HTML.
- [`comment_class`](https://developer.wordpress.org/reference/hooks/comment_class/) - Filters the returned CSS classes for the current comment.
- [`comment_reply_link`](https://developer.wordpress.org/reference/hooks/comment_reply_link/) - Filters the comment reply link.
- [`date_formats`](https://developer.wordpress.org/reference/hooks/date_formats/) - Filters the default date formats.
- [`edit_bookmark_link`](https://developer.wordpress.org/reference/hooks/edit_bookmark_link/) - Filters the bookmark edit link anchor tag.
- [`edit_tag_link`](https://developer.wordpress.org/reference/hooks/edit_tag_link/) - Filters the anchor tag for the edit link for a tag (or term in another taxonomy).
- [`excerpt_length`](https://developer.wordpress.org/reference/hooks/excerpt_length/) - Filters the maximum number of words in a post excerpt.
- [`get_categories_taxonomy`](https://developer.wordpress.org/reference/hooks/get_categories_taxonomy/) - Filters the taxonomy used to retrieve terms when calling get_categories().
- [`get_comments_pagenum_link`](https://developer.wordpress.org/reference/hooks/get_comments_pagenum_link/) - Filters the comments page number link for the current request.
- [`get_edit_bookmark_link`](https://developer.wordpress.org/reference/hooks/get_edit_bookmark_link/) - Filters the bookmark edit link.
- [`get_edit_tag_link`](https://developer.wordpress.org/reference/hooks/get_edit_tag_link/) - Filters the edit link for a tag (or term in another taxonomy).
- [`get_search_form`](https://developer.wordpress.org/reference/hooks/get_search_form/) - Filters the HTML output of the search form.
- [`get_usernumposts`](https://developer.wordpress.org/reference/hooks/get_usernumposts/) - Filters the number of posts a user has written.
- [`http_headers_useragent`](https://developer.wordpress.org/reference/hooks/http_headers_useragent/) - Filters the user agent value sent with an HTTP request.
- [`http_request_args`](https://developer.wordpress.org/reference/hooks/http_request_args/) - Filters the arguments used in an HTTP request.
- [`http_request_redirection_count`](https://developer.wordpress.org/reference/hooks/http_request_redirection_count/) - Filters the number of redirects allowed during an HTTP request.
- [`http_request_timeout`](https://developer.wordpress.org/reference/hooks/http_request_timeout/) - Filters the timeout value for an HTTP request.
- [`http_request_version`](https://developer.wordpress.org/reference/hooks/http_request_version/) - Filters the version of the HTTP protocol used in a request.
- [`install_plugin_complete_actions`](https://developer.wordpress.org/reference/hooks/install_plugin_complete_actions/) - Filters the list of action links available following a single plugin installation.
- [`install_plugins_nonmenu_tabs`](https://developer.wordpress.org/reference/hooks/install_plugins_nonmenu_tabs/) - Filters tabs not associated with a menu item on the Add Plugins screen.
- [`install_plugins_tabs`](https://developer.wordpress.org/reference/hooks/install_plugins_tabs/) - Filters the tabs shown on the Add Plugins screen.
- [`next_comments_link_attributes`](https://developer.wordpress.org/reference/hooks/next_comments_link_attributes/) - Filters the anchor tag attributes for the next comments page link.
- [`next_posts_link_attributes`](https://developer.wordpress.org/reference/hooks/next_posts_link_attributes/) - Filters the anchor tag attributes for the next posts page link.
- [`plugin_action_links_{$plugin_file}`](https://developer.wordpress.org/reference/hooks/plugin_action_links_plugin_file/) - Filters the list of action links displayed for a specific plugin in the Plugins list table.
- [`plugin_install_action_links`](https://developer.wordpress.org/reference/hooks/plugin_install_action_links/) - Filters the install action links for a plugin.
- [`plugins_api`](https://developer.wordpress.org/reference/hooks/plugins_api/) - Filters the response for the current WordPress.org Plugin Installation API request.
- [`plugins_api_args`](https://developer.wordpress.org/reference/hooks/plugins_api_args/) - Filters the WordPress.org Plugin Installation API arguments.
- [`plugins_api_result`](https://developer.wordpress.org/reference/hooks/plugins_api_result/) - Filters the Plugin Installation API response results.
- [`post_class`](https://developer.wordpress.org/reference/hooks/post_class/) - Filters the list of CSS class names for the current post.
- [`post_comments_link`](https://developer.wordpress.org/reference/hooks/post_comments_link/) - Filters the formatted post comments link HTML.
- [`previous_comments_link_attributes`](https://developer.wordpress.org/reference/hooks/previous_comments_link_attributes/) - Filters the anchor tag attributes for the previous comments page link.
- [`previous_posts_link_attributes`](https://developer.wordpress.org/reference/hooks/previous_posts_link_attributes/) - Filters the anchor tag attributes for the previous posts page link.
- [`quick_edit_dropdown_pages_args`](https://developer.wordpress.org/reference/hooks/quick_edit_dropdown_pages_args/) - Filters the arguments used to generate the Quick Edit page-parent drop-down.
- [`sidebars_widgets`](https://developer.wordpress.org/reference/hooks/sidebars_widgets/) - Filters the list of sidebars and their widgets.
- [`site_url`](https://developer.wordpress.org/reference/hooks/site_url/) - Filters the site URL.
- [`teeny_mce_before_init`](https://developer.wordpress.org/reference/hooks/teeny_mce_before_init/) - Filters the teenyMCE config before init.
- [`teeny_mce_buttons`](https://developer.wordpress.org/reference/hooks/teeny_mce_buttons/) - Filters the list of teenyMCE buttons (Code tab).
- [`teeny_mce_plugins`](https://developer.wordpress.org/reference/hooks/teeny_mce_plugins/) - Filters the list of teenyMCE plugins.
- [`the_password_form`](https://developer.wordpress.org/reference/hooks/the_password_form/) - Filters the HTML output for the protected post password form.
- [`the_preview`](https://developer.wordpress.org/reference/hooks/the_preview/) - Filters the single post for preview mode.
- [`thread_comments_depth_max`](https://developer.wordpress.org/reference/hooks/thread_comments_depth_max/) - Filters the maximum depth of threaded/nested comments.
- [`time_formats`](https://developer.wordpress.org/reference/hooks/time_formats/) - Filters the default time formats.
- [`update_plugin_complete_actions`](https://developer.wordpress.org/reference/hooks/update_plugin_complete_actions/) - Filters the list of action links available following a single plugin update.
- [`use_curl_transport`](https://developer.wordpress.org/reference/hooks/use_curl_transport/) - Filters whether cURL can be used as a transport for retrieving a URL.
- [`use_streams_transport`](https://developer.wordpress.org/reference/hooks/use_streams_transport/) - Filters whether streams can be used as a transport for retrieving a URL.
- [`validate_current_theme`](https://developer.wordpress.org/reference/hooks/validate_current_theme/) - Filters whether to validate the active theme.
- [`wp_comment_reply`](https://developer.wordpress.org/reference/hooks/wp_comment_reply/) - Filters the in-line comment reply-to form output in the Comments list table.
- [`wp_count_comments`](https://developer.wordpress.org/reference/hooks/wp_count_comments/) - Filters the comments count for a given post or the whole site.
- [`wp_get_attachment_link`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_link/) - Filters a retrieved attachment page link.
- [`wp_insert_post_data`](https://developer.wordpress.org/reference/hooks/wp_insert_post_data/) - Filters slashed post data just before it is inserted into the database.
- [`wp_page_menu`](https://developer.wordpress.org/reference/hooks/wp_page_menu/) - Filters the HTML output of a page-based menu.
- [`wp_page_menu_args`](https://developer.wordpress.org/reference/hooks/wp_page_menu_args/) - Filters the arguments used to generate a page-based menu.
- [`xmlrpc_allow_anonymous_comments`](https://developer.wordpress.org/reference/hooks/xmlrpc_allow_anonymous_comments/) - Filters whether to allow anonymous comments over XML-RPC.

### Changes

- [`pre_get_search_form`](https://developer.wordpress.org/reference/hooks/pre_get_search_form/) - as 'get_search_form' action.

## WordPress 2.6

### New Actions

- [`_wp_put_post_revision`](https://developer.wordpress.org/reference/hooks/_wp_put_post_revision/) - Fires once a revision has been saved.
- [`admin_action_{$action}`](https://developer.wordpress.org/reference/hooks/admin_action_action/) - Fires when an 'action' request variable is sent.
- [`admin_post`](https://developer.wordpress.org/reference/hooks/admin_post/) - Fires on an authenticated admin post request where no action is supplied.
- [`admin_post_nopriv`](https://developer.wordpress.org/reference/hooks/admin_post_nopriv/) - Fires on a non-authenticated admin post request where no action is supplied.
- [`admin_post_nopriv_{$action}`](https://developer.wordpress.org/reference/hooks/admin_post_nopriv_action/) - Fires on a non-authenticated admin post request for the given action.
- [`admin_post_{$action}`](https://developer.wordpress.org/reference/hooks/admin_post_action/) - Fires on an authenticated admin post request for the given action.
- [`admin_print_styles`](https://developer.wordpress.org/reference/hooks/admin_print_styles/) - Fires when styles are printed for all admin pages.
- [`admin_print_styles-{$hook_suffix}`](https://developer.wordpress.org/reference/hooks/admin_print_styles-hook_suffix/) - Fires when styles are printed for a specific admin page based on $hook_suffix.
- [`populate_options`](https://developer.wordpress.org/reference/hooks/populate_options/) - Fires before creating WordPress options and populating their default values.
- [`post-html-upload-ui`](https://developer.wordpress.org/reference/hooks/post-html-upload-ui/) - Fires after the upload button in the media upload interface.
- [`post-plupload-upload-ui`](https://developer.wordpress.org/reference/hooks/post-plupload-upload-ui/) - Fires after the upload interface loads.
- [`post-upload-ui`](https://developer.wordpress.org/reference/hooks/post-upload-ui/) - Fires on the post upload UI screen.
- [`pre-html-upload-ui`](https://developer.wordpress.org/reference/hooks/pre-html-upload-ui/) - Fires before the upload button in the media upload interface.
- [`pre-plupload-upload-ui`](https://developer.wordpress.org/reference/hooks/pre-plupload-upload-ui/) - Fires before the upload interface loads.
- [`pre-upload-ui`](https://developer.wordpress.org/reference/hooks/pre-upload-ui/) - Fires just before the legacy (pre-3.5.0) upload interface is loaded.
- [`set_logged_in_cookie`](https://developer.wordpress.org/reference/hooks/set_logged_in_cookie/) - Fires immediately before the logged-in authentication cookie is set.
- [`setup_theme`](https://developer.wordpress.org/reference/hooks/setup_theme/) - Fires before the theme is loaded.
- [`wp_default_scripts`](https://developer.wordpress.org/reference/hooks/wp_default_scripts/) - Fires when the WP_Scripts instance is initialized.
- [`wp_default_styles`](https://developer.wordpress.org/reference/hooks/wp_default_styles/) - Fires when the WP_Styles instance is initialized.
- [`wp_delete_post_revision`](https://developer.wordpress.org/reference/hooks/wp_delete_post_revision/) - Fires once a post revision has been deleted.
- [`wp_print_styles`](https://developer.wordpress.org/reference/hooks/wp_print_styles/) - Fires before styles in the $handles queue are printed.
- [`wp_restore_post_revision`](https://developer.wordpress.org/reference/hooks/wp_restore_post_revision/) - Fires after a post revision has been restored.

### New Filters

- [`_wp_post_revision_fields`](https://developer.wordpress.org/reference/hooks/_wp_post_revision_fields/) - Filters the list of fields saved in post revisions.
- [`avatar_defaults`](https://developer.wordpress.org/reference/hooks/avatar_defaults/) - Filters the default avatars.
- [`comment_row_actions`](https://developer.wordpress.org/reference/hooks/comment_row_actions/) - Filters the action links displayed for each comment in the Comments list table.
- [`comments_per_page`](https://developer.wordpress.org/reference/hooks/comments_per_page/) - Filters the number of comments listed per page in the comments list table.
- [`default_avatar_select`](https://developer.wordpress.org/reference/hooks/default_avatar_select/) - Filters the HTML output of the default avatar list.
- [`disable_captions`](https://developer.wordpress.org/reference/hooks/disable_captions/) - Filters whether to disable captions.
- [`editable_slug`](https://developer.wordpress.org/reference/hooks/editable_slug/) - Filters the editable slug for a post or term.
- [`filesystem_method`](https://developer.wordpress.org/reference/hooks/filesystem_method/) - Filters the filesystem method to use.
- [`filesystem_method_file`](https://developer.wordpress.org/reference/hooks/filesystem_method_file/) - Filters the path for a specific filesystem method class file.
- [`get_archives_link`](https://developer.wordpress.org/reference/hooks/get_archives_link/) - Filters the archive link content.
- [`get_image_tag`](https://developer.wordpress.org/reference/hooks/get_image_tag/) - Filters the HTML content for the image tag.
- [`get_image_tag_class`](https://developer.wordpress.org/reference/hooks/get_image_tag_class/) - Filters the value of the attachment's image tag class attribute.
- [`get_post_time`](https://developer.wordpress.org/reference/hooks/get_post_time/) - Filters the localized time of the post.
- [`image_add_caption_shortcode`](https://developer.wordpress.org/reference/hooks/image_add_caption_shortcode/) - Filters the image HTML markup including the caption shortcode.
- [`image_make_intermediate_size`](https://developer.wordpress.org/reference/hooks/image_make_intermediate_size/) - Filters the name of the saved image file.
- [`img_caption_shortcode`](https://developer.wordpress.org/reference/hooks/img_caption_shortcode/) - Filters the default caption shortcode output.
- [`media_upload_form_url`](https://developer.wordpress.org/reference/hooks/media_upload_form_url/) - Filters the media upload form action URL.
- [`pre_update_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_update_option_option/) - Filters a specific option before its value is (maybe) serialized and updated.
- [`print_styles_array`](https://developer.wordpress.org/reference/hooks/print_styles_array/) - Filters the array of enqueued styles before processing for output.
- [`style_loader_src`](https://developer.wordpress.org/reference/hooks/style_loader_src/) - Filters an enqueued style's fully-qualified URL.
- [`style_loader_tag`](https://developer.wordpress.org/reference/hooks/style_loader_tag/) - Filters the HTML link tag of an enqueued style.
- [`the_excerpt_export`](https://developer.wordpress.org/reference/hooks/the_excerpt_export/) - Filters the post excerpt used for WXR exports.
- [`widget_links_args`](https://developer.wordpress.org/reference/hooks/widget_links_args/) - Filters the arguments for the Links widget.
- [`widget_title`](https://developer.wordpress.org/reference/hooks/widget_title/) - Filters the widget title.
- [`xmlrpc_blog_options`](https://developer.wordpress.org/reference/hooks/xmlrpc_blog_options/) - Filters the XML-RPC blog options property.
- [`{$adjacent}_post_link`](https://developer.wordpress.org/reference/hooks/adjacent_post_link/) - Filters the adjacent post link.

### Changes

- [`plugin_action_links`](https://developer.wordpress.org/reference/hooks/plugin_action_links/) - The <code>$context</code> parameter was added.
- [`post-plupload-upload-ui`](https://developer.wordpress.org/reference/hooks/post-plupload-upload-ui/) - As 'post-flash-upload-ui'
- [`pre-plupload-upload-ui`](https://developer.wordpress.org/reference/hooks/pre-plupload-upload-ui/) - As 'pre-flash-upload-ui'

## WordPress 2.5

### New Actions

- [`add_option_{$option}`](https://developer.wordpress.org/reference/hooks/add_option_option/) - Fires after a specific option has been added.
- [`admin_head_{$content_func}`](https://developer.wordpress.org/reference/hooks/admin_head_content_func/) - Fires in the admin header for each specific form tab in the legacy (pre-3.5.0) media upload popup.
- [`admin_init`](https://developer.wordpress.org/reference/hooks/admin_init/) - Fires as an admin screen or script is being initialized.
- [`admin_page_access_denied`](https://developer.wordpress.org/reference/hooks/admin_page_access_denied/) - Fires when access to an admin page is denied.
- [`adminmenu`](https://developer.wordpress.org/reference/hooks/adminmenu/) - Fires after the admin menu has been output.
- [`clean_object_term_cache`](https://developer.wordpress.org/reference/hooks/clean_object_term_cache/) - Fires after the object term cache has been cleaned.
- [`clean_page_cache`](https://developer.wordpress.org/reference/hooks/clean_page_cache/) - Fires immediately after the given page's cache is cleaned.
- [`clean_post_cache`](https://developer.wordpress.org/reference/hooks/clean_post_cache/) - Fires immediately after the given post's cache is cleaned.
- [`clean_term_cache`](https://developer.wordpress.org/reference/hooks/clean_term_cache/) - Fires once after each taxonomy's term cache has been cleaned.
- [`delete_term`](https://developer.wordpress.org/reference/hooks/delete_term/) - Fires after a term is deleted from the database and the cache is cleaned.
- [`deprecated_file_included`](https://developer.wordpress.org/reference/hooks/deprecated_file_included/) - Fires when a deprecated file is called.
- [`deprecated_function_run`](https://developer.wordpress.org/reference/hooks/deprecated_function_run/) - Fires when a deprecated function is called.
- [`in_admin_footer`](https://developer.wordpress.org/reference/hooks/in_admin_footer/) - Fires after the opening tag for the admin footer.
- [`manage_comments_nav`](https://developer.wordpress.org/reference/hooks/manage_comments_nav/) - Fires after the Filter submit button for comment types.
- [`manage_media_custom_column`](https://developer.wordpress.org/reference/hooks/manage_media_custom_column/) - Fires for each custom column in the Media list table.
- [`manage_pages_custom_column`](https://developer.wordpress.org/reference/hooks/manage_pages_custom_column/) - Fires in each custom column on the Posts list table.
- [`media_buttons`](https://developer.wordpress.org/reference/hooks/media_buttons/) - Fires after the default media button(s) are displayed.
- [`media_upload_{$tab}`](https://developer.wordpress.org/reference/hooks/media_upload_tab/) - Fires inside limited and specific upload-tab views in the legacy (pre-3.5.0) media popup.
- [`media_upload_{$type}`](https://developer.wordpress.org/reference/hooks/media_upload_type/) - Fires inside specific upload-type views in the legacy (pre-3.5.0) media popup based on the current tab.
- [`pre_post_update`](https://developer.wordpress.org/reference/hooks/pre_post_update/) - Fires immediately before an existing post is updated in the database.
- [`retrieve_password_key`](https://developer.wordpress.org/reference/hooks/retrieve_password_key/) - Fires when a password reset key is generated.
- [`rightnow_end`](https://developer.wordpress.org/reference/hooks/rightnow_end/) - Fires at the end of the 'At a Glance' dashboard widget.
- [`set_auth_cookie`](https://developer.wordpress.org/reference/hooks/set_auth_cookie/) - Fires immediately before the authentication cookie is set.
- [`submitlink_box`](https://developer.wordpress.org/reference/hooks/submitlink_box/) - Fires at the end of the Publish box in the Link editing screen.
- [`submitpage_box`](https://developer.wordpress.org/reference/hooks/submitpage_box/) - Fires before meta boxes with 'side' context are output for the 'page' post type.
- [`submitpost_box`](https://developer.wordpress.org/reference/hooks/submitpost_box/) - Fires before meta boxes with 'side' context are output for all post types other than 'page'.
- [`wp_dashboard_setup`](https://developer.wordpress.org/reference/hooks/wp_dashboard_setup/) - Fires after core widgets for the admin dashboard have been registered.
- [`wp_login_failed`](https://developer.wordpress.org/reference/hooks/wp_login_failed/) - Fires after a user login has failed.
- [`xmlrpc_call`](https://developer.wordpress.org/reference/hooks/xmlrpc_call/) - Fires after the XML-RPC user has been authenticated but before the rest of the method logic begins.

### New Filters

- [`async_upload_{$type}`](https://developer.wordpress.org/reference/hooks/async_upload_type/) - Filters the returned ID of an uploaded attachment.
- [`attachment_fields_to_edit`](https://developer.wordpress.org/reference/hooks/attachment_fields_to_edit/) - Filters the attachment fields to edit.
- [`attachment_fields_to_save`](https://developer.wordpress.org/reference/hooks/attachment_fields_to_save/) - Filters the attachment fields to be saved.
- [`auth_cookie`](https://developer.wordpress.org/reference/hooks/auth_cookie/) - Filters the authentication cookie.
- [`check_password`](https://developer.wordpress.org/reference/hooks/check_password/) - Filters whether the plaintext password matches the hashed password.
- [`comment_status_links`](https://developer.wordpress.org/reference/hooks/comment_status_links/) - Filters the comment status links.
- [`comments_open`](https://developer.wordpress.org/reference/hooks/comments_open/) - Filters whether the current post is open for comments.
- [`comments_popup_link_attributes`](https://developer.wordpress.org/reference/hooks/comments_popup_link_attributes/) - Filters the comments link attributes for display.
- [`dashboard_primary_link`](https://developer.wordpress.org/reference/hooks/dashboard_primary_link/) - Filters the primary link URL for the 'WordPress Events and News' dashboard widget.
- [`default_feed`](https://developer.wordpress.org/reference/hooks/default_feed/) - Filters the default feed type.
- [`deprecated_file_trigger_error`](https://developer.wordpress.org/reference/hooks/deprecated_file_trigger_error/) - Filters whether to trigger an error for deprecated files.
- [`deprecated_function_trigger_error`](https://developer.wordpress.org/reference/hooks/deprecated_function_trigger_error/) - Filters whether to trigger an error for deprecated functions.
- [`dynamic_sidebar_params`](https://developer.wordpress.org/reference/hooks/dynamic_sidebar_params/) - Filters the parameters passed to a widget's display callback.
- [`editor_max_image_size`](https://developer.wordpress.org/reference/hooks/editor_max_image_size/) - Filters the maximum image size dimensions for the editor.
- [`ext2type`](https://developer.wordpress.org/reference/hooks/ext2type/) - Filters file type based on the extension name.
- [`file_is_displayable_image`](https://developer.wordpress.org/reference/hooks/file_is_displayable_image/) - Filters whether the current image is displayable in the browser.
- [`gallery_style`](https://developer.wordpress.org/reference/hooks/gallery_style/) - Filters the gallery shortcode's default CSS styles and opening HTML div container.
- [`get_avatar`](https://developer.wordpress.org/reference/hooks/get_avatar/) - Filters the HTML for a user's avatar.
- [`get_pagenum_link`](https://developer.wordpress.org/reference/hooks/get_pagenum_link/) - Filters the page number link for the current request.
- [`get_the_generator_{$type}`](https://developer.wordpress.org/reference/hooks/get_the_generator_type/) - Filters the HTML for the retrieved generator type.
- [`get_user_option_{$option}`](https://developer.wordpress.org/reference/hooks/get_user_option_option/) - Filters a specific user option value.
- [`get_{$adjacent}_post_join`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_join/) - Filters the JOIN clause in the SQL for an adjacent post query.
- [`get_{$adjacent}_post_sort`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_sort/) - Filters the ORDER BY clause in the SQL for an adjacent post query.
- [`get_{$adjacent}_post_where`](https://developer.wordpress.org/reference/hooks/get_adjacent_post_where/) - Filters the WHERE clause in the SQL for an adjacent post query.
- [`got_rewrite`](https://developer.wordpress.org/reference/hooks/got_rewrite/) - Filters whether Apache and mod_rewrite are present.
- [`icon_dirs`](https://developer.wordpress.org/reference/hooks/icon_dirs/) - Filters the array of icon directory URIs.
- [`image_downsize`](https://developer.wordpress.org/reference/hooks/image_downsize/) - Filters whether to preempt the output of image_downsize().
- [`image_send_to_editor`](https://developer.wordpress.org/reference/hooks/image_send_to_editor/) - Filters the image HTML markup to send to the editor when inserting an image.
- [`intermediate_image_sizes`](https://developer.wordpress.org/reference/hooks/intermediate_image_sizes/) - Filters the list of intermediate image sizes.
- [`jpeg_quality`](https://developer.wordpress.org/reference/hooks/jpeg_quality/) - Filters the JPEG compression quality for backward-compatibility.
- [`language_attributes`](https://developer.wordpress.org/reference/hooks/language_attributes/) - Filters the language attributes for display in the 'html' tag.
- [`login_messages`](https://developer.wordpress.org/reference/hooks/login_messages/) - Filters instructional messages displayed above the login form.
- [`manage_media_columns`](https://developer.wordpress.org/reference/hooks/manage_media_columns/) - Filters the Media list table columns.
- [`manage_pages_columns`](https://developer.wordpress.org/reference/hooks/manage_pages_columns/) - Filters the columns displayed in the Pages list table.
- [`mce_buttons_4`](https://developer.wordpress.org/reference/hooks/mce_buttons_4/) - Filters the fourth-row list of TinyMCE buttons (Visual tab).
- [`mce_external_languages`](https://developer.wordpress.org/reference/hooks/mce_external_languages/) - Filters the translations loaded for external TinyMCE 3.x plugins.
- [`mce_external_plugins`](https://developer.wordpress.org/reference/hooks/mce_external_plugins/) - Filters the list of TinyMCE external plugins.
- [`media_meta`](https://developer.wordpress.org/reference/hooks/media_meta/) - Filters the media metadata.
- [`media_send_to_editor`](https://developer.wordpress.org/reference/hooks/media_send_to_editor/) - Filters the HTML markup for a media item sent to the editor.
- [`media_upload_default_tab`](https://developer.wordpress.org/reference/hooks/media_upload_default_tab/) - Filters the default tab in the legacy (pre-3.5.0) media popup.
- [`media_upload_default_type`](https://developer.wordpress.org/reference/hooks/media_upload_default_type/) - Filters the default media upload type in the legacy (pre-3.5.0) media popup.
- [`media_upload_tabs`](https://developer.wordpress.org/reference/hooks/media_upload_tabs/) - Filters the available tabs in the legacy (pre-3.5.0) media popup.
- [`nonce_life`](https://developer.wordpress.org/reference/hooks/nonce_life/) - Filters the lifespan of nonces in seconds.
- [`pings_open`](https://developer.wordpress.org/reference/hooks/pings_open/) - Filters whether the current post is open for pings.
- [`plugin_action_links`](https://developer.wordpress.org/reference/hooks/plugin_action_links/) - Filters the action links displayed for each plugin in the Plugins list table.
- [`post_date_column_time`](https://developer.wordpress.org/reference/hooks/post_date_column_time/) (2.5.1) - Filters the published, scheduled, or unpublished time of the post.
- [`post_gallery`](https://developer.wordpress.org/reference/hooks/post_gallery/) - Filters the default gallery shortcode output.
- [`post_limits_request`](https://developer.wordpress.org/reference/hooks/post_limits_request/) - Filters the LIMIT clause of the query.
- [`post_mime_types`](https://developer.wordpress.org/reference/hooks/post_mime_types/) - Filters the default list of post mime types.
- [`posts_distinct_request`](https://developer.wordpress.org/reference/hooks/posts_distinct_request/) - Filters the DISTINCT clause of the query.
- [`posts_fields_request`](https://developer.wordpress.org/reference/hooks/posts_fields_request/) - Filters the SELECT clause of the query.
- [`posts_groupby_request`](https://developer.wordpress.org/reference/hooks/posts_groupby_request/) - Filters the GROUP BY clause of the query.
- [`posts_join_request`](https://developer.wordpress.org/reference/hooks/posts_join_request/) - Filters the JOIN clause of the query.
- [`posts_orderby_request`](https://developer.wordpress.org/reference/hooks/posts_orderby_request/) - Filters the ORDER BY clause of the query.
- [`posts_where_request`](https://developer.wordpress.org/reference/hooks/posts_where_request/) - Filters the WHERE clause of the query.
- [`pre_remote_source`](https://developer.wordpress.org/reference/hooks/pre_remote_source/) - Filters the pingback remote source.
- [`request_filesystem_credentials`](https://developer.wordpress.org/reference/hooks/request_filesystem_credentials/) - Filters the filesystem credentials.
- [`salt`](https://developer.wordpress.org/reference/hooks/salt/) - Filters the WordPress salt.
- [`search_feed_link`](https://developer.wordpress.org/reference/hooks/search_feed_link/) - Filters the search feed link.
- [`term_link`](https://developer.wordpress.org/reference/hooks/term_link/) - Filters the term link.
- [`term_links-{$taxonomy}`](https://developer.wordpress.org/reference/hooks/term_links-taxonomy/) - Filters the term links for a given taxonomy.
- [`term_name`](https://developer.wordpress.org/reference/hooks/term_name/) - Filters display of the term name in the terms list table.
- [`the_content_export`](https://developer.wordpress.org/reference/hooks/the_content_export/) - Filters the post content used for WXR exports.
- [`the_generator`](https://developer.wordpress.org/reference/hooks/the_generator/) - Filters the output of the XHTML generator tag, for display.
- [`tiny_mce_before_init`](https://developer.wordpress.org/reference/hooks/tiny_mce_before_init/) - Filters the TinyMCE config before init.
- [`update_feedback`](https://developer.wordpress.org/reference/hooks/update_feedback/) - Filters feedback messages displayed during the core update process.
- [`upload_size_limit`](https://developer.wordpress.org/reference/hooks/upload_size_limit/) - Filters the maximum upload size allowed in php.ini.
- [`wp_authenticate_user`](https://developer.wordpress.org/reference/hooks/wp_authenticate_user/) - Filters whether the given user can be authenticated with the provided password.
- [`wp_dashboard_widgets`](https://developer.wordpress.org/reference/hooks/wp_dashboard_widgets/) - Filters the list of widgets to load for the admin dashboard.
- [`wp_default_editor`](https://developer.wordpress.org/reference/hooks/wp_default_editor/) - Filters which editor should be displayed by default.
- [`wp_generator_type`](https://developer.wordpress.org/reference/hooks/wp_generator_type/) - Filters the output of the XHTML generator tag.
- [`wp_list_bookmarks`](https://developer.wordpress.org/reference/hooks/wp_list_bookmarks/) - Filters the bookmarks list before it is echoed or returned.
- [`wp_read_image_metadata`](https://developer.wordpress.org/reference/hooks/wp_read_image_metadata/) - Filters the array of meta data read from an image's exif data.
- [`wp_read_image_metadata_types`](https://developer.wordpress.org/reference/hooks/wp_read_image_metadata_types/) - Filters the image types to check for exif data.
- [`wp_sprintf`](https://developer.wordpress.org/reference/hooks/wp_sprintf/) - Filters a fragment from the pattern passed to wp_sprintf().
- [`wp_sprintf_l`](https://developer.wordpress.org/reference/hooks/wp_sprintf_l/) - Filters the translated delimiters used by wp_sprintf_l().

### Changes

- [`add_option_{$option}`](https://developer.wordpress.org/reference/hooks/add_option_option/) - As <code>add_option_{$name}</code>
- [`category_link`](https://developer.wordpress.org/reference/hooks/category_link/) - Deprecated in favor of {@see 'term_link'} filter.
- [`tag_link`](https://developer.wordpress.org/reference/hooks/tag_link/) - Deprecated in favor of {@see 'term_link'} filter.

## WordPress 2.3

### New Actions

- [`after_plugin_row`](https://developer.wordpress.org/reference/hooks/after_plugin_row/) - Fires after each row in the Plugins list table.
- [`check_comment_flood`](https://developer.wordpress.org/reference/hooks/check_comment_flood/) - Fires immediately before a comment is marked approved.
- [`commentsrss2_head`](https://developer.wordpress.org/reference/hooks/commentsrss2_head/) - Fires at the end of the RSS2 comment feed header.
- [`create_term`](https://developer.wordpress.org/reference/hooks/create_term/) - Fires immediately after a new term is created, before the term cache is cleaned.
- [`create_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/create_taxonomy/) - Fires after a new term is created for a specific taxonomy.
- [`created_term`](https://developer.wordpress.org/reference/hooks/created_term/) - Fires after a new term is created, and after the term cache has been cleaned.
- [`created_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/created_taxonomy/) - Fires after a new term in a specific taxonomy is created, and after the term cache has been cleaned.
- [`delete_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/delete_taxonomy/) - Fires after a term in a specific taxonomy is deleted.
- [`edit_term`](https://developer.wordpress.org/reference/hooks/edit_term/) - Fires after a term has been updated, but before the term cache has been cleaned.
- [`edit_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/edit_taxonomy/) - Fires after a term in a specific taxonomy has been updated, but before the term cache has been cleaned.
- [`edited_term`](https://developer.wordpress.org/reference/hooks/edited_term/) - Fires after a term has been updated, and the term cache has been cleaned.
- [`edited_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/edited_taxonomy/) - Fires after a term for a specific taxonomy has been updated, and the term cache has been cleaned.
- [`export_wp`](https://developer.wordpress.org/reference/hooks/export_wp/) - Fires at the beginning of an export, before any headers are sent.
- [`load_feed_engine`](https://developer.wordpress.org/reference/hooks/load_feed_engine/) - Fires before MagpieRSS is loaded, to optionally replace it.
- [`posts_selection`](https://developer.wordpress.org/reference/hooks/posts_selection/) - Fires to announce the query's current selection parameters.
- [`transition_post_status`](https://developer.wordpress.org/reference/hooks/transition_post_status/) - Fires when a post is transitioned from one status to another.
- [`wp_update_comment_count`](https://developer.wordpress.org/reference/hooks/wp_update_comment_count/) - Fires immediately after a post's comment count is updated in the database.
- [`{$new_status}_{$post->post_type}`](https://developer.wordpress.org/reference/hooks/new_status_post-post_type/) - Fires when a post is transitioned from one status to another.
- [`{$old_status}_to_{$new_status}`](https://developer.wordpress.org/reference/hooks/old_status_to_new_status/) - Fires when a post is transitioned from one status to another.

### New Filters

- [`admin_body_class`](https://developer.wordpress.org/reference/hooks/admin_body_class/) - Filters the CSS classes for the body tag in the admin.
- [`allowed_redirect_hosts`](https://developer.wordpress.org/reference/hooks/allowed_redirect_hosts/) - Filters the list of allowed hosts to redirect to.
- [`clean_url`](https://developer.wordpress.org/reference/hooks/clean_url/) - Filters a string cleaned and escaped for output as a URL.
- [`dashboard_primary_feed`](https://developer.wordpress.org/reference/hooks/dashboard_primary_feed/) - Filters the primary feed URL for the 'WordPress Events and News' dashboard widget.
- [`dashboard_primary_title`](https://developer.wordpress.org/reference/hooks/dashboard_primary_title/) - Filters the primary link title for the 'WordPress Events and News' dashboard widget.
- [`dashboard_secondary_feed`](https://developer.wordpress.org/reference/hooks/dashboard_secondary_feed/) - Filters the secondary feed URL for the 'WordPress Events and News' dashboard widget.
- [`dashboard_secondary_link`](https://developer.wordpress.org/reference/hooks/dashboard_secondary_link/) - Filters the secondary link URL for the 'WordPress Events and News' dashboard widget.
- [`dashboard_secondary_title`](https://developer.wordpress.org/reference/hooks/dashboard_secondary_title/) - Filters the secondary link title for the 'WordPress Events and News' dashboard widget.
- [`edit_comment_link`](https://developer.wordpress.org/reference/hooks/edit_comment_link/) - Filters the comment edit link anchor tag.
- [`edit_post_link`](https://developer.wordpress.org/reference/hooks/edit_post_link/) - Filters the post edit link anchor tag.
- [`edit_term_{$field}`](https://developer.wordpress.org/reference/hooks/edit_term_field/) - Filters a term field to edit before it is sanitized.
- [`edit_{$field}`](https://developer.wordpress.org/reference/hooks/edit_field/) - Filters the value of a specific post field to edit.
- [`edit_{$taxonomy}_{$field}`](https://developer.wordpress.org/reference/hooks/edit_taxonomy_field/) - Filters the taxonomy field to edit before it is sanitized.
- [`get_comment`](https://developer.wordpress.org/reference/hooks/get_comment/) - Fires after a comment is retrieved.
- [`get_edit_comment_link`](https://developer.wordpress.org/reference/hooks/get_edit_comment_link/) - Filters the comment edit link.
- [`get_edit_post_link`](https://developer.wordpress.org/reference/hooks/get_edit_post_link/) - Filters the post edit link.
- [`get_lastpostdate`](https://developer.wordpress.org/reference/hooks/get_lastpostdate/) - Filters the most recent time that a post on the site was published.
- [`get_lastpostmodified`](https://developer.wordpress.org/reference/hooks/get_lastpostmodified/) - Filters the most recent time that a post on the site was modified.
- [`get_search_query`](https://developer.wordpress.org/reference/hooks/get_search_query/) - Filters the contents of the search query variable.
- [`get_tags`](https://developer.wordpress.org/reference/hooks/get_tags/) - Filters the array of term objects returned for the 'post_tag' taxonomy.
- [`get_term`](https://developer.wordpress.org/reference/hooks/get_term/) - Filters a taxonomy term object.
- [`get_terms`](https://developer.wordpress.org/reference/hooks/get_terms/) - Filters the found terms.
- [`get_the_tags`](https://developer.wordpress.org/reference/hooks/get_the_tags/) - Filters the array of tags for the given post.
- [`get_{$taxonomy}`](https://developer.wordpress.org/reference/hooks/get_taxonomy/) - Filters a taxonomy term object.
- [`import_upload_size_limit`](https://developer.wordpress.org/reference/hooks/import_upload_size_limit/) - Filters the maximum allowed upload size for import files.
- [`list_terms_exclusions`](https://developer.wordpress.org/reference/hooks/list_terms_exclusions/) - Filters the terms to exclude from the terms query.
- [`posts_results`](https://developer.wordpress.org/reference/hooks/posts_results/) - Filters the raw post results array, prior to status checks.
- [`pre_kses`](https://developer.wordpress.org/reference/hooks/pre_kses/) - Filters content to be run through KSES.
- [`pre_term_{$field}`](https://developer.wordpress.org/reference/hooks/pre_term_field/) - Filters a term field value before it is sanitized.
- [`pre_{$field}`](https://developer.wordpress.org/reference/hooks/pre_field/) - Filters the value of a specific post field before saving.
- [`pre_{$taxonomy}_{$field}`](https://developer.wordpress.org/reference/hooks/pre_taxonomy_field/) - Filters a taxonomy field before it is sanitized.
- [`print_scripts_array`](https://developer.wordpress.org/reference/hooks/print_scripts_array/) - Filters the list of script dependencies left to print.
- [`redirect_canonical`](https://developer.wordpress.org/reference/hooks/redirect_canonical/) - Filters the canonical redirect URL.
- [`sanitize_option_{$option}`](https://developer.wordpress.org/reference/hooks/sanitize_option_option/) - Filters an option value following sanitization.
- [`single_tag_title`](https://developer.wordpress.org/reference/hooks/single_tag_title/) - Filters the tag archive page title.
- [`tag_feed_link`](https://developer.wordpress.org/reference/hooks/tag_feed_link/) - Filters the post tag feed link.
- [`tag_link`](https://developer.wordpress.org/reference/hooks/tag_link/) - Filters the tag link.
- [`term_id_filter`](https://developer.wordpress.org/reference/hooks/term_id_filter/) - Filters the term ID after a new term is created.
- [`term_{$field}`](https://developer.wordpress.org/reference/hooks/term_field/) - Filters the term field sanitized for display.
- [`term_{$field}_rss`](https://developer.wordpress.org/reference/hooks/term_field_rss/) - Filters the term field for use in RSS.
- [`the_permalink_rss`](https://developer.wordpress.org/reference/hooks/the_permalink_rss/) - Filters the permalink to the post for use in feeds.
- [`the_search_query`](https://developer.wordpress.org/reference/hooks/the_search_query/) - Filters the contents of the search query variable, for display.
- [`the_tags`](https://developer.wordpress.org/reference/hooks/the_tags/) - Filters the tags list for a given post.
- [`update_footer`](https://developer.wordpress.org/reference/hooks/update_footer/) - Filters the version/update text displayed in the admin footer.
- [`widget_text`](https://developer.wordpress.org/reference/hooks/widget_text/) - Filters the content of the Text widget.
- [`wp_admin_css`](https://developer.wordpress.org/reference/hooks/wp_admin_css/) - Filters the stylesheet link to the specified CSS file.
- [`wp_admin_css_uri`](https://developer.wordpress.org/reference/hooks/wp_admin_css_uri/) - Filters the URI of a WordPress admin CSS file.
- [`wp_dropdown_users`](https://developer.wordpress.org/reference/hooks/wp_dropdown_users/) - Filters the wp_dropdown_users() HTML output.
- [`wp_generate_tag_cloud`](https://developer.wordpress.org/reference/hooks/wp_generate_tag_cloud/) - Filters the generated output of a tag cloud.
- [`wp_mail_charset`](https://developer.wordpress.org/reference/hooks/wp_mail_charset/) - Filters the default wp_mail() charset.
- [`wp_mail_content_type`](https://developer.wordpress.org/reference/hooks/wp_mail_content_type/) - Filters the wp_mail() content type.
- [`wp_mail_from_name`](https://developer.wordpress.org/reference/hooks/wp_mail_from_name/) - Filters the name to associate with the "from" email address.
- [`wp_redirect_status`](https://developer.wordpress.org/reference/hooks/wp_redirect_status/) - Filters the redirect HTTP response status code to use.
- [`wp_tag_cloud`](https://developer.wordpress.org/reference/hooks/wp_tag_cloud/) - Filters the tag cloud output.
- [`{$field_no_prefix}_edit_pre`](https://developer.wordpress.org/reference/hooks/field_no_prefix_edit_pre/) - Filters the value of a specific post field to edit.
- [`{$field_no_prefix}_save_pre`](https://developer.wordpress.org/reference/hooks/field_no_prefix_save_pre/) - Filters the value of a specific field before saving.
- [`{$field}`](https://developer.wordpress.org/reference/hooks/field/) - Filters the value of a specific post field for display.
- [`{$field}_pre`](https://developer.wordpress.org/reference/hooks/field_pre/) - Filters the value of a specific post field before saving.
- [`{$taxonomy}_{$field}`](https://developer.wordpress.org/reference/hooks/taxonomy_field/) - Filters the taxonomy field sanitized for display.
- [`{$taxonomy}_{$field}_rss`](https://developer.wordpress.org/reference/hooks/taxonomy_field_rss/) - Filters the taxonomy field for use in RSS.

### Changes

_No changes in this version._

## WordPress 2.2

### New Actions

- [`_admin_menu`](https://developer.wordpress.org/reference/hooks/_admin_menu/) - Fires before the administration menu loads in the admin.
- [`admin_xml_ns`](https://developer.wordpress.org/reference/hooks/admin_xml_ns/) - Fires inside the HTML tag in the admin header.
- [`comment_atom_entry`](https://developer.wordpress.org/reference/hooks/comment_atom_entry/) - Fires at the end of each Atom comment feed item.
- [`comment_loop_start`](https://developer.wordpress.org/reference/hooks/comment_loop_start/) - Fires once the comment loop is started.
- [`deleted_link`](https://developer.wordpress.org/reference/hooks/deleted_link/) - Fires after a link has been deleted.
- [`deleted_post`](https://developer.wordpress.org/reference/hooks/deleted_post/) - Fires immediately after a post is deleted from the database.
- [`get_sidebar`](https://developer.wordpress.org/reference/hooks/get_sidebar/) - Fires before the sidebar template file is loaded.
- [`phpmailer_init`](https://developer.wordpress.org/reference/hooks/phpmailer_init/) - Fires after PHPMailer is initialized.
- [`sidebar_admin_page`](https://developer.wordpress.org/reference/hooks/sidebar_admin_page/) - Fires after the available widgets and sidebars have loaded, before the admin footer.
- [`sidebar_admin_setup`](https://developer.wordpress.org/reference/hooks/sidebar_admin_setup/) - Fires early before the Widgets administration screen loads, after scripts are enqueued.
- [`widgets_init`](https://developer.wordpress.org/reference/hooks/widgets_init/) - Fires after all default WordPress widgets have been registered.

### New Filters

- [`atom_enclosure`](https://developer.wordpress.org/reference/hooks/atom_enclosure/) - Filters the atom enclosure HTML link tag for the current post.
- [`comment_feed_groupby`](https://developer.wordpress.org/reference/hooks/comment_feed_groupby/) - Filters the GROUP BY clause of the comments feed query before sending.
- [`comment_feed_join`](https://developer.wordpress.org/reference/hooks/comment_feed_join/) - Filters the JOIN clause of the comments feed query before sending.
- [`comment_feed_where`](https://developer.wordpress.org/reference/hooks/comment_feed_where/) - Filters the WHERE clause of the comments feed query before sending.
- [`get_bloginfo_rss`](https://developer.wordpress.org/reference/hooks/get_bloginfo_rss/) - Filters the bloginfo for use in RSS feeds.
- [`get_wp_title_rss`](https://developer.wordpress.org/reference/hooks/get_wp_title_rss/) - Filters the blog title for use as the feed title.
- [`getarchives_join`](https://developer.wordpress.org/reference/hooks/getarchives_join/) - Filters the SQL JOIN clause for retrieving archives.
- [`getarchives_where`](https://developer.wordpress.org/reference/hooks/getarchives_where/) - Filters the SQL WHERE clause for retrieving archives.
- [`link_category`](https://developer.wordpress.org/reference/hooks/link_category/) - Filters the category name.
- [`link_title`](https://developer.wordpress.org/reference/hooks/link_title/) - Filters the OPML outline link title text.
- [`ngettext`](https://developer.wordpress.org/reference/hooks/ngettext/) - Filters the singular or plural form of a string.
- [`rss_enclosure`](https://developer.wordpress.org/reference/hooks/rss_enclosure/) - Filters the RSS enclosure HTML link tag for the current post.
- [`script_loader_src`](https://developer.wordpress.org/reference/hooks/script_loader_src/) - Filters the script loader source.
- [`status_header`](https://developer.wordpress.org/reference/hooks/status_header/) - Filters an HTTP status header.
- [`the_meta_key`](https://developer.wordpress.org/reference/hooks/the_meta_key/) - Filters the HTML output of the li element in the post custom fields list.
- [`theme_mod_{$name}`](https://developer.wordpress.org/reference/hooks/theme_mod_name/) - Filters the theme modification, or 'theme_mod', value.
- [`trackback_url`](https://developer.wordpress.org/reference/hooks/trackback_url/) - Filters the returned trackback URL.
- [`url_to_postid`](https://developer.wordpress.org/reference/hooks/url_to_postid/) - Filters the URL to derive the post ID from.
- [`user_trailingslashit`](https://developer.wordpress.org/reference/hooks/user_trailingslashit/) - Filters the trailing-slashed string, depending on whether the site is set to use trailing slashes.
- [`wp_mail`](https://developer.wordpress.org/reference/hooks/wp_mail/) - Filters the wp_mail() arguments.
- [`wp_mail_from`](https://developer.wordpress.org/reference/hooks/wp_mail_from/) - Filters the email address to send from.
- [`wp_parse_str`](https://developer.wordpress.org/reference/hooks/wp_parse_str/) (2.2.1) - Filters the array of variables derived from a parsed string.
- [`wp_title_rss`](https://developer.wordpress.org/reference/hooks/wp_title_rss/) - Filters the blog title for display of the feed title.
- [`xmlrpc_text_filters`](https://developer.wordpress.org/reference/hooks/xmlrpc_text_filters/) - Filters the MoveableType text filters list for XML-RPC.

### Changes

_No changes in this version._

## WordPress 2.1

### New Actions

- [`admin_head`](https://developer.wordpress.org/reference/hooks/admin_head/) - Fires in head section for all admin pages.
- [`admin_head-{$hook_suffix}`](https://developer.wordpress.org/reference/hooks/admin_head-hook_suffix/) - Fires in head section for a specific admin page.
- [`admin_print_scripts`](https://developer.wordpress.org/reference/hooks/admin_print_scripts/) - Fires when scripts are printed for all admin pages.
- [`admin_print_scripts-{$hook_suffix}`](https://developer.wordpress.org/reference/hooks/admin_print_scripts-hook_suffix/) - Fires when scripts are printed for a specific admin page based on $hook_suffix.
- [`blog_privacy_selector`](https://developer.wordpress.org/reference/hooks/blog_privacy_selector/) - Enables the legacy 'Site visibility' privacy options.
- [`check_ajax_referer`](https://developer.wordpress.org/reference/hooks/check_ajax_referer/) - Fires once the Ajax request has been validated or not.
- [`commentrss2_item`](https://developer.wordpress.org/reference/hooks/commentrss2_item/) - Fires at the end of each RSS2 comment feed item.
- [`dbx_post_sidebar`](https://developer.wordpress.org/reference/hooks/dbx_post_sidebar/) - Fires after all meta box sections have been output, before the closing #post-body div.
- [`do_feed_{$feed}`](https://developer.wordpress.org/reference/hooks/do_feed_feed/) - Fires once the given feed is loaded.
- [`do_robots`](https://developer.wordpress.org/reference/hooks/do_robots/) - Fired when the template loader determines a robots.txt request.
- [`do_robotstxt`](https://developer.wordpress.org/reference/hooks/do_robotstxt/) - Fires when displaying the robots.txt file.
- [`get_footer`](https://developer.wordpress.org/reference/hooks/get_footer/) - Fires before the footer template file is loaded.
- [`get_header`](https://developer.wordpress.org/reference/hooks/get_header/) - Fires before the header template file is loaded.
- [`load-{$page_hook}`](https://developer.wordpress.org/reference/hooks/load-page_hook/) - Fires before a particular screen is loaded.
- [`load-{$pagenow}`](https://developer.wordpress.org/reference/hooks/load-pagenow/) - Fires before a particular screen is loaded.
- [`login_form`](https://developer.wordpress.org/reference/hooks/login_form/) - Fires following the 'Password' field in the login form.
- [`login_head`](https://developer.wordpress.org/reference/hooks/login_head/) - Fires in the login page header after scripts are enqueued.
- [`lostpassword_form`](https://developer.wordpress.org/reference/hooks/lostpassword_form/) - Fires inside the lostpassword form tags, before the hidden fields.
- [`lostpassword_post`](https://developer.wordpress.org/reference/hooks/lostpassword_post/) - Fires before errors are returned from a password reset request.
- [`manage_link_custom_column`](https://developer.wordpress.org/reference/hooks/manage_link_custom_column/) - Fires for each registered custom link column.
- [`parse_request`](https://developer.wordpress.org/reference/hooks/parse_request/) - Fires once all query variables for the current request have been parsed.
- [`register_form`](https://developer.wordpress.org/reference/hooks/register_form/) - Fires following the 'Email' field in the user registration form.
- [`register_post`](https://developer.wordpress.org/reference/hooks/register_post/) - Fires when submitting registration form data, before the user is created.
- [`restrict_manage_posts`](https://developer.wordpress.org/reference/hooks/restrict_manage_posts/) - Fires before the Filter button on the Posts and Pages list tables.
- [`send_headers`](https://developer.wordpress.org/reference/hooks/send_headers/) - Fires once the requested HTTP headers for caching, content type, etc. have been sent.
- [`wp`](https://developer.wordpress.org/reference/hooks/wp/) - Fires once the WordPress environment has been set up.
- [`wp_ajax_{$action}`](https://developer.wordpress.org/reference/hooks/wp_ajax_action/) - Fires authenticated Ajax actions for logged-in users.
- [`wp_print_scripts`](https://developer.wordpress.org/reference/hooks/wp_print_scripts/) - Fires before scripts in the $handles queue are printed.
- [`xmlrpc_publish_post`](https://developer.wordpress.org/reference/hooks/xmlrpc_publish_post/) - Fires when _publish_post_hook() is called during an XML-RPC request.

### New Filters

- [`_get_page_link`](https://developer.wordpress.org/reference/hooks/_get_page_link/) - Filters the permalink for a non-page_on_front page.
- [`author_link`](https://developer.wordpress.org/reference/hooks/author_link/) - Filters the URL to the author's page.
- [`bloginfo_rss`](https://developer.wordpress.org/reference/hooks/bloginfo_rss/) - Filters the bloginfo for display in RSS feeds.
- [`comment_edit_redirect`](https://developer.wordpress.org/reference/hooks/comment_edit_redirect/) - Filters the URI the user is redirected to after editing a comment in the admin.
- [`comment_flood_filter`](https://developer.wordpress.org/reference/hooks/comment_flood_filter/) - Filters the comment flood status.
- [`comments_array`](https://developer.wordpress.org/reference/hooks/comments_array/) - Filters the comments array.
- [`cron_schedules`](https://developer.wordpress.org/reference/hooks/cron_schedules/) - Filters the non-default cron schedules.
- [`found_posts`](https://developer.wordpress.org/reference/hooks/found_posts/) - Filters the number of found posts for the query.
- [`found_posts_query`](https://developer.wordpress.org/reference/hooks/found_posts_query/) - Filters the query to run for retrieving the found posts.
- [`get_attached_file`](https://developer.wordpress.org/reference/hooks/get_attached_file/) - Filters the attached file based on the given ID.
- [`get_bookmarks`](https://developer.wordpress.org/reference/hooks/get_bookmarks/) - Filters the returned list of bookmarks.
- [`get_pages`](https://developer.wordpress.org/reference/hooks/get_pages/) - Filters the retrieved list of pages.
- [`get_the_modified_date`](https://developer.wordpress.org/reference/hooks/get_the_modified_date/) - Filters the date a post was last modified.
- [`locale_stylesheet_uri`](https://developer.wordpress.org/reference/hooks/locale_stylesheet_uri/) - Filters the localized stylesheet URI.
- [`login_errors`](https://developer.wordpress.org/reference/hooks/login_errors/) - Filters the error messages displayed above the login form.
- [`login_headerurl`](https://developer.wordpress.org/reference/hooks/login_headerurl/) - Filters link URL of the header logo above login form.
- [`login_message`](https://developer.wordpress.org/reference/hooks/login_message/) - Filters the message to display above the login form.
- [`mce_css`](https://developer.wordpress.org/reference/hooks/mce_css/) - Filters the comma-delimited list of stylesheets to load in TinyMCE.
- [`post_limits`](https://developer.wordpress.org/reference/hooks/post_limits/) - Filters the LIMIT clause of the query.
- [`postmeta_form_limit`](https://developer.wordpress.org/reference/hooks/postmeta_form_limit/) - Filters the number of custom fields to retrieve for the drop-down in the Custom Fields meta box.
- [`posts_distinct`](https://developer.wordpress.org/reference/hooks/posts_distinct/) - Filters the DISTINCT clause of the query.
- [`posts_fields`](https://developer.wordpress.org/reference/hooks/posts_fields/) - Filters the SELECT clause of the query.
- [`pre_comment_approved`](https://developer.wordpress.org/reference/hooks/pre_comment_approved/) - Filters a comment's approval status before it is set.
- [`pre_upload_error`](https://developer.wordpress.org/reference/hooks/pre_upload_error/) - Filters whether to preempt the XML-RPC media upload.
- [`query`](https://developer.wordpress.org/reference/hooks/query/) - Filters the database query.
- [`registration_errors`](https://developer.wordpress.org/reference/hooks/registration_errors/) - Filters the errors encountered when a new user is being registered.
- [`request`](https://developer.wordpress.org/reference/hooks/request/) - Filters the array of parsed query variables.
- [`rss_update_frequency`](https://developer.wordpress.org/reference/hooks/rss_update_frequency/) - Filters the RSS update frequency.
- [`rss_update_period`](https://developer.wordpress.org/reference/hooks/rss_update_period/) - Filters how often to update the RSS feed.
- [`the_editor`](https://developer.wordpress.org/reference/hooks/the_editor/) - Filters the HTML markup output that displays the editor.
- [`the_editor_content`](https://developer.wordpress.org/reference/hooks/the_editor_content/) - Filters the default editor content.
- [`the_modified_date`](https://developer.wordpress.org/reference/hooks/the_modified_date/) - Filters the date a post was last modified, for display.
- [`update_attached_file`](https://developer.wordpress.org/reference/hooks/update_attached_file/) - Filters the path to the attached file to update.
- [`user_can_richedit`](https://developer.wordpress.org/reference/hooks/user_can_richedit/) - Filters whether the user can access the visual editor.
- [`user_registration_email`](https://developer.wordpress.org/reference/hooks/user_registration_email/) - Filters the email address of a user being registered.
- [`wp_create_file_in_uploads`](https://developer.wordpress.org/reference/hooks/wp_create_file_in_uploads/) - Filters the attachment file path after the custom header or background image is set.
- [`wp_delete_file`](https://developer.wordpress.org/reference/hooks/wp_delete_file/) - Filters the path of the file to delete.
- [`wp_dropdown_cats`](https://developer.wordpress.org/reference/hooks/wp_dropdown_cats/) - Filters the taxonomy drop-down output.
- [`wp_dropdown_pages`](https://developer.wordpress.org/reference/hooks/wp_dropdown_pages/) - Filters the HTML output of a list of pages as a dropdown.
- [`wp_generate_attachment_metadata`](https://developer.wordpress.org/reference/hooks/wp_generate_attachment_metadata/) - Filters the generated attachment meta data.
- [`wp_get_attachment_metadata`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_metadata/) - Filters the attachment meta data.
- [`wp_get_attachment_thumb_url`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_thumb_url/) - Filters the attachment thumbnail URL.
- [`wp_get_attachment_url`](https://developer.wordpress.org/reference/hooks/wp_get_attachment_url/) - Filters the attachment URL.
- [`wp_handle_upload`](https://developer.wordpress.org/reference/hooks/wp_handle_upload/) - Filters the data array for the uploaded file.
- [`wp_list_categories`](https://developer.wordpress.org/reference/hooks/wp_list_categories/) - Filters the HTML output of a taxonomy list.
- [`wp_list_pages_excludes`](https://developer.wordpress.org/reference/hooks/wp_list_pages_excludes/) - Filters the array of pages to exclude from the pages list.
- [`wp_mime_type_icon`](https://developer.wordpress.org/reference/hooks/wp_mime_type_icon/) - Filters the mime type icon.
- [`wp_redirect`](https://developer.wordpress.org/reference/hooks/wp_redirect/) - Filters the redirect location.
- [`wp_update_attachment_metadata`](https://developer.wordpress.org/reference/hooks/wp_update_attachment_metadata/) - Filters the updated attachment meta data.

### Changes

_No changes in this version._

## WordPress 2.0

### New Actions

- [`activate_{$plugin}`](https://developer.wordpress.org/reference/hooks/activate_plugin/) - Fires as a specific plugin is being activated.
- [`activity_box_end`](https://developer.wordpress.org/reference/hooks/activity_box_end/) - Fires at the end of the 'At a Glance' dashboard widget.
- [`add_attachment`](https://developer.wordpress.org/reference/hooks/add_attachment/) - Fires once an attachment has been added.
- [`add_link`](https://developer.wordpress.org/reference/hooks/add_link/) - Fires after a link was added to the database.
- [`atom_entry`](https://developer.wordpress.org/reference/hooks/atom_entry/) - Fires at the end of each Atom feed item.
- [`atom_head`](https://developer.wordpress.org/reference/hooks/atom_head/) - Fires just before the first Atom feed entry.
- [`atom_ns`](https://developer.wordpress.org/reference/hooks/atom_ns/) - Fires at end of the Atom feed root to add namespaces.
- [`deactivate_{$plugin}`](https://developer.wordpress.org/reference/hooks/deactivate_plugin/) - Fires as a specific plugin is being deactivated.
- [`delete_attachment`](https://developer.wordpress.org/reference/hooks/delete_attachment/) - Fires before an attachment is deleted, at the start of wp_delete_attachment().
- [`delete_link`](https://developer.wordpress.org/reference/hooks/delete_link/) - Fires before a link is deleted.
- [`delete_user`](https://developer.wordpress.org/reference/hooks/delete_user/) - Fires immediately before a user is deleted from the site.
- [`edit_attachment`](https://developer.wordpress.org/reference/hooks/edit_attachment/) - Fires once an existing attachment has been updated.
- [`edit_link`](https://developer.wordpress.org/reference/hooks/edit_link/) - Fires after a link was updated in the database.
- [`edit_user_profile`](https://developer.wordpress.org/reference/hooks/edit_user_profile/) - Fires after the 'Application Passwords' section is loaded on 'Edit User' screen.
- [`loop_end`](https://developer.wordpress.org/reference/hooks/loop_end/) - Fires once the loop has ended.
- [`loop_start`](https://developer.wordpress.org/reference/hooks/loop_start/) - Fires once the loop is started.
- [`personal_options_update`](https://developer.wordpress.org/reference/hooks/personal_options_update/) - Fires before the page loads on the 'Profile' editing screen.
- [`pre_get_posts`](https://developer.wordpress.org/reference/hooks/pre_get_posts/) - Fires after the query variable object is created, but before the actual query is run.
- [`pre_ping`](https://developer.wordpress.org/reference/hooks/pre_ping/) - Fires just before pinging back links found in a post.
- [`profile_personal_options`](https://developer.wordpress.org/reference/hooks/profile_personal_options/) - Fires after the 'Personal Options' settings table on the 'Profile' editing screen.
- [`profile_update`](https://developer.wordpress.org/reference/hooks/profile_update/) - Fires immediately after an existing user is updated.
- [`rdf_header`](https://developer.wordpress.org/reference/hooks/rdf_header/) - Fires at the end of the RDF feed header.
- [`rdf_item`](https://developer.wordpress.org/reference/hooks/rdf_item/) - Fires at the end of each RDF feed item.
- [`rdf_ns`](https://developer.wordpress.org/reference/hooks/rdf_ns/) - Fires at the end of the feed root to add namespaces.
- [`rss2_head`](https://developer.wordpress.org/reference/hooks/rss2_head/) - Fires at the end of the RSS2 Feed Header.
- [`rss2_item`](https://developer.wordpress.org/reference/hooks/rss2_item/) - Fires at the end of each RSS2 feed item.
- [`rss2_ns`](https://developer.wordpress.org/reference/hooks/rss2_ns/) - Fires at the end of the RSS root to add namespaces.
- [`rss_head`](https://developer.wordpress.org/reference/hooks/rss_head/) - Fires at the end of the RSS Feed Header.
- [`rss_item`](https://developer.wordpress.org/reference/hooks/rss_item/) - Fires at the end of each RSS feed item.
- [`sanitize_comment_cookies`](https://developer.wordpress.org/reference/hooks/sanitize_comment_cookies/) (2.0.11) - Fires when comment cookies are sanitized.
- [`set_current_user`](https://developer.wordpress.org/reference/hooks/set_current_user/) (2.0.1) - Fires after the current user is set.
- [`show_user_profile`](https://developer.wordpress.org/reference/hooks/show_user_profile/) - Fires after the 'Application Passwords' section is loaded on the 'Profile' editing screen.
- [`update_option_{$option}`](https://developer.wordpress.org/reference/hooks/update_option_option/) (2.0.1) - Fires after the value of a specific option has been successfully updated.
- [`wp_insert_post`](https://developer.wordpress.org/reference/hooks/wp_insert_post/) - Fires once a post has been saved.

### New Filters

- [`add_ping`](https://developer.wordpress.org/reference/hooks/add_ping/) - Filters the new ping URL to add for the given post.
- [`attachment_link`](https://developer.wordpress.org/reference/hooks/attachment_link/) - Filters the permalink for an attachment.
- [`attribute_escape`](https://developer.wordpress.org/reference/hooks/attribute_escape/) (2.0.6) - Filters a string cleaned and escaped for output in an HTML attribute.
- [`bloginfo_url`](https://developer.wordpress.org/reference/hooks/bloginfo_url/) (2.0.5) - Filters the URL returned by get_bloginfo().
- [`comment_edit_pre`](https://developer.wordpress.org/reference/hooks/comment_edit_pre/) - Filters the comment content before editing.
- [`comment_post_redirect`](https://developer.wordpress.org/reference/hooks/comment_post_redirect/) (2.0.5) - Filters the location URI to send the commenter after posting.
- [`get_enclosed`](https://developer.wordpress.org/reference/hooks/get_enclosed/) - Filters the list of enclosures already enclosed for the given post.
- [`get_pung`](https://developer.wordpress.org/reference/hooks/get_pung/) - Filters the list of already-pinged URLs for the given post.
- [`get_the_modified_time`](https://developer.wordpress.org/reference/hooks/get_the_modified_time/) - Filters the localized time a post was last modified.
- [`get_to_ping`](https://developer.wordpress.org/reference/hooks/get_to_ping/) - Filters the list of URLs yet to ping for the given post.
- [`get_users_drafts`](https://developer.wordpress.org/reference/hooks/get_users_drafts/) - Filters the SQL query string for the user's drafts query.
- [`gettext`](https://developer.wordpress.org/reference/hooks/gettext/) (2.0.11) - Filters text with its translation.
- [`icon_dir`](https://developer.wordpress.org/reference/hooks/icon_dir/) - Filters the icon directory path.
- [`icon_dir_uri`](https://developer.wordpress.org/reference/hooks/icon_dir_uri/) - Filters the icon directory URI.
- [`js_escape`](https://developer.wordpress.org/reference/hooks/js_escape/) (2.0.6) - Filters a string cleaned and escaped for output in JavaScript.
- [`mce_buttons`](https://developer.wordpress.org/reference/hooks/mce_buttons/) - Filters the first-row list of TinyMCE buttons (Visual tab).
- [`mce_buttons_2`](https://developer.wordpress.org/reference/hooks/mce_buttons_2/) - Filters the second-row list of TinyMCE buttons (Visual tab).
- [`mce_buttons_3`](https://developer.wordpress.org/reference/hooks/mce_buttons_3/) - Filters the third-row list of TinyMCE buttons (Visual tab).
- [`posts_groupby`](https://developer.wordpress.org/reference/hooks/posts_groupby/) - Filters the GROUP BY clause of the query.
- [`posts_request`](https://developer.wordpress.org/reference/hooks/posts_request/) - Filters the completed SQL query before sending.
- [`pre_category_nicename`](https://developer.wordpress.org/reference/hooks/pre_category_nicename/) (2.0.3) - Filters the category nicename before it is sanitized.
- [`pre_user_description`](https://developer.wordpress.org/reference/hooks/pre_user_description/) (2.0.3) - Filters a user's description before the user is created or updated.
- [`pre_user_display_name`](https://developer.wordpress.org/reference/hooks/pre_user_display_name/) (2.0.3) - Filters a user's display name before the user is created or updated.
- [`pre_user_email`](https://developer.wordpress.org/reference/hooks/pre_user_email/) (2.0.3) - Filters a user's email before the user is created or updated.
- [`pre_user_first_name`](https://developer.wordpress.org/reference/hooks/pre_user_first_name/) (2.0.3) - Filters a user's first name before the user is created or updated.
- [`pre_user_last_name`](https://developer.wordpress.org/reference/hooks/pre_user_last_name/) (2.0.3) - Filters a user's last name before the user is created or updated.
- [`pre_user_login`](https://developer.wordpress.org/reference/hooks/pre_user_login/) (2.0.3) - Filters a username after it has been sanitized.
- [`pre_user_nicename`](https://developer.wordpress.org/reference/hooks/pre_user_nicename/) (2.0.3) - Filters a user's nicename before the user is created or updated.
- [`pre_user_nickname`](https://developer.wordpress.org/reference/hooks/pre_user_nickname/) (2.0.3) - Filters a user's nickname before the user is created or updated.
- [`pre_user_url`](https://developer.wordpress.org/reference/hooks/pre_user_url/) (2.0.3) - Filters a user's URL before the user is created or updated.
- [`prepend_attachment`](https://developer.wordpress.org/reference/hooks/prepend_attachment/) - Filters the attachment markup to be prepended to the post content.
- [`preview_post_link`](https://developer.wordpress.org/reference/hooks/preview_post_link/) (2.0.5) - Filters the URL used for a post preview.
- [`role_has_cap`](https://developer.wordpress.org/reference/hooks/role_has_cap/) - Filters which capabilities a role has.
- [`sanitize_user`](https://developer.wordpress.org/reference/hooks/sanitize_user/) (2.0.1) - Filters a sanitized username string.
- [`single_cat_title`](https://developer.wordpress.org/reference/hooks/single_cat_title/) (2.0.10) - Filters the category archive page title.
- [`the_modified_time`](https://developer.wordpress.org/reference/hooks/the_modified_time/) - Filters the localized time a post was last modified, for display.
- [`upload_dir`](https://developer.wordpress.org/reference/hooks/upload_dir/) - Filters the uploads directory data.
- [`upload_mimes`](https://developer.wordpress.org/reference/hooks/upload_mimes/) - Filters the list of allowed mime types and file extensions.
- [`user_has_cap`](https://developer.wordpress.org/reference/hooks/user_has_cap/) - Dynamically filter a user's capabilities.
- [`validate_username`](https://developer.wordpress.org/reference/hooks/validate_username/) (2.0.1) - Filters whether the provided username is valid.
- [`wp_title`](https://developer.wordpress.org/reference/hooks/wp_title/) - Filters the text of the page title.

### Changes

_No changes in this version._

## WordPress 1.5

### New Actions

- [`admin_menu`](https://developer.wordpress.org/reference/hooks/admin_menu/) - Fires before the administration menu loads in the admin.
- [`check_admin_referer`](https://developer.wordpress.org/reference/hooks/check_admin_referer/) (1.5.1) - Fires once the admin request has been validated or not.
- [`check_passwords`](https://developer.wordpress.org/reference/hooks/check_passwords/) (1.5.1) - Fires before the password and confirm password fields are checked for congruity.
- [`comment_closed`](https://developer.wordpress.org/reference/hooks/comment_closed/) - Fires when a comment is attempted on a post that has comments closed.
- [`comment_flood_trigger`](https://developer.wordpress.org/reference/hooks/comment_flood_trigger/) - Fires before the comment flood message is triggered.
- [`comment_form`](https://developer.wordpress.org/reference/hooks/comment_form/) - Fires at the bottom of the comment form, inside the closing form tag.
- [`comment_id_not_found`](https://developer.wordpress.org/reference/hooks/comment_id_not_found/) - Fires when a comment is attempted on a post that does not exist.
- [`comment_on_draft`](https://developer.wordpress.org/reference/hooks/comment_on_draft/) (1.5.1) - Fires when a comment is attempted on a post in draft mode.
- [`edit_form_advanced`](https://developer.wordpress.org/reference/hooks/edit_form_advanced/) - Fires after 'normal' context meta boxes have been output for all post types other than 'page'.
- [`edit_page_form`](https://developer.wordpress.org/reference/hooks/edit_page_form/) - Fires after 'normal' context meta boxes have been output for the 'page' post type.
- [`generate_rewrite_rules`](https://developer.wordpress.org/reference/hooks/generate_rewrite_rules/) - Fires after the rewrite rules are generated.
- [`init`](https://developer.wordpress.org/reference/hooks/init/) - Fires after WordPress has finished loading but before any headers are sent.
- [`load-{$plugin_page}`](https://developer.wordpress.org/reference/hooks/load-plugin_page/) - Fires before a particular screen is loaded.
- [`lost_password`](https://developer.wordpress.org/reference/hooks/lost_password/) (1.5.1) - Fires before the lost password form.
- [`manage_posts_custom_column`](https://developer.wordpress.org/reference/hooks/manage_posts_custom_column/) - Fires in each custom column in the Posts list table.
- [`parse_query`](https://developer.wordpress.org/reference/hooks/parse_query/) - Fires after the main query vars have been parsed.
- [`password_reset`](https://developer.wordpress.org/reference/hooks/password_reset/) - Fires before the user's password is reset.
- [`plugins_loaded`](https://developer.wordpress.org/reference/hooks/plugins_loaded/) - Fires once activated plugins have loaded.
- [`retrieve_password`](https://developer.wordpress.org/reference/hooks/retrieve_password/) (1.5.1) - Fires before a new password is retrieved.
- [`save_post`](https://developer.wordpress.org/reference/hooks/save_post/) - Fires once a post has been saved.
- [`switch_theme`](https://developer.wordpress.org/reference/hooks/switch_theme/) - Fires after the theme is switched.
- [`template_redirect`](https://developer.wordpress.org/reference/hooks/template_redirect/) - Fires before determining which template to load.
- [`user_register`](https://developer.wordpress.org/reference/hooks/user_register/) - Fires immediately after a new user is registered.
- [`wp_authenticate`](https://developer.wordpress.org/reference/hooks/wp_authenticate/) (1.5.1) - Fires before the user is authenticated.
- [`wp_footer`](https://developer.wordpress.org/reference/hooks/wp_footer/) (1.5.1) - Prints scripts or data before the closing body tag on the front end.
- [`wp_head`](https://developer.wordpress.org/reference/hooks/wp_head/) - Prints scripts or data in the head tag on the front end.
- [`wp_login`](https://developer.wordpress.org/reference/hooks/wp_login/) - Fires after the user has successfully logged in.
- [`wp_logout`](https://developer.wordpress.org/reference/hooks/wp_logout/) - Fires after a user is logged out.
- [`wp_meta`](https://developer.wordpress.org/reference/hooks/wp_meta/) - Fires before displaying echoed content in the sidebar.
- [`wp_set_comment_status`](https://developer.wordpress.org/reference/hooks/wp_set_comment_status/) - Fires immediately after transitioning a comment's status from one to another in the database and removing the comment from the object cache, but prior to all status transition hooks.

### New Filters

- [`author_feed_link`](https://developer.wordpress.org/reference/hooks/author_feed_link/) (1.5.1) - Filters the feed link for a given author.
- [`author_rewrite_rules`](https://developer.wordpress.org/reference/hooks/author_rewrite_rules/) - Filters rewrite rules used for author archives.
- [`category_feed_link`](https://developer.wordpress.org/reference/hooks/category_feed_link/) (1.5.1) - Filters the category feed link.
- [`category_link`](https://developer.wordpress.org/reference/hooks/category_link/) - Filters the category link.
- [`comment_author_rss`](https://developer.wordpress.org/reference/hooks/comment_author_rss/) - Filters the current comment author for use in a feed.
- [`comment_moderation_subject`](https://developer.wordpress.org/reference/hooks/comment_moderation_subject/) (1.5.2) - Filters the comment moderation email subject.
- [`comment_moderation_text`](https://developer.wordpress.org/reference/hooks/comment_moderation_text/) (1.5.2) - Filters the comment moderation email text.
- [`comment_notification_headers`](https://developer.wordpress.org/reference/hooks/comment_notification_headers/) (1.5.2) - Filters the comment notification email headers.
- [`comment_notification_subject`](https://developer.wordpress.org/reference/hooks/comment_notification_subject/) (1.5.2) - Filters the comment notification email subject.
- [`comment_notification_text`](https://developer.wordpress.org/reference/hooks/comment_notification_text/) (1.5.2) - Filters the comment notification email text.
- [`comment_save_pre`](https://developer.wordpress.org/reference/hooks/comment_save_pre/) - Filters the comment content before it is updated in the database.
- [`comment_text_rss`](https://developer.wordpress.org/reference/hooks/comment_text_rss/) - Filters the current comment content for use in a feed.
- [`comments_number`](https://developer.wordpress.org/reference/hooks/comments_number/) - Filters the comments count for display.
- [`comments_rewrite_rules`](https://developer.wordpress.org/reference/hooks/comments_rewrite_rules/) - Filters rewrite rules used for comment feed archives.
- [`comments_template`](https://developer.wordpress.org/reference/hooks/comments_template/) (1.5.1) - Filters the path to the theme template file used for the comments template.
- [`date_rewrite_rules`](https://developer.wordpress.org/reference/hooks/date_rewrite_rules/) - Filters rewrite rules used for date archives.
- [`day_link`](https://developer.wordpress.org/reference/hooks/day_link/) - Filters the day archive permalink.
- [`default_content`](https://developer.wordpress.org/reference/hooks/default_content/) - Filters the default post content initially used in the "Write Post" form.
- [`default_excerpt`](https://developer.wordpress.org/reference/hooks/default_excerpt/) - Filters the default post excerpt initially used in the "Write Post" form.
- [`default_title`](https://developer.wordpress.org/reference/hooks/default_title/) - Filters the default post title initially used in the "Write Post" form.
- [`feed_link`](https://developer.wordpress.org/reference/hooks/feed_link/) - Filters the feed type permalink.
- [`get_comment_ID`](https://developer.wordpress.org/reference/hooks/get_comment_ID/) - Filters the returned comment ID.
- [`get_comment_author`](https://developer.wordpress.org/reference/hooks/get_comment_author/) - Filters the returned comment author name.
- [`get_comment_author_IP`](https://developer.wordpress.org/reference/hooks/get_comment_author_IP/) - Filters the comment author's returned IP address.
- [`get_comment_author_email`](https://developer.wordpress.org/reference/hooks/get_comment_author_email/) - Filters the comment author's returned email address.
- [`get_comment_author_link`](https://developer.wordpress.org/reference/hooks/get_comment_author_link/) - Filters the comment author's link for display.
- [`get_comment_author_url`](https://developer.wordpress.org/reference/hooks/get_comment_author_url/) - Filters the comment author's URL.
- [`get_comment_author_url_link`](https://developer.wordpress.org/reference/hooks/get_comment_author_url_link/) - Filters the comment author's returned URL link.
- [`get_comment_date`](https://developer.wordpress.org/reference/hooks/get_comment_date/) - Filters the returned comment date.
- [`get_comment_excerpt`](https://developer.wordpress.org/reference/hooks/get_comment_excerpt/) - Filters the retrieved comment excerpt.
- [`get_comment_text`](https://developer.wordpress.org/reference/hooks/get_comment_text/) - Filters the text of a comment.
- [`get_comment_time`](https://developer.wordpress.org/reference/hooks/get_comment_time/) - Filters the returned comment time.
- [`get_comment_type`](https://developer.wordpress.org/reference/hooks/get_comment_type/) - Filters the returned comment type.
- [`get_comments_number`](https://developer.wordpress.org/reference/hooks/get_comments_number/) - Filters the returned comment count for a post.
- [`get_the_guid`](https://developer.wordpress.org/reference/hooks/get_the_guid/) - Filters the Global Unique Identifier (guid) of the post.
- [`get_the_time`](https://developer.wordpress.org/reference/hooks/get_the_time/) - Filters the time of the post.
- [`locale`](https://developer.wordpress.org/reference/hooks/locale/) - Filters the locale ID of the WordPress installation.
- [`loginout`](https://developer.wordpress.org/reference/hooks/loginout/) - Filters the HTML output for the Log In/Log Out link.
- [`manage_posts_columns`](https://developer.wordpress.org/reference/hooks/manage_posts_columns/) - Filters the columns displayed in the Posts list table.
- [`mod_rewrite_rules`](https://developer.wordpress.org/reference/hooks/mod_rewrite_rules/) - Filters the list of rewrite rules formatted for output to an .htaccess file.
- [`month_link`](https://developer.wordpress.org/reference/hooks/month_link/) - Filters the month archive permalink.
- [`option_{$option}`](https://developer.wordpress.org/reference/hooks/option_option/) - Filters the value of an existing option.
- [`page_link`](https://developer.wordpress.org/reference/hooks/page_link/) - Filters the permalink for a page.
- [`page_rewrite_rules`](https://developer.wordpress.org/reference/hooks/page_rewrite_rules/) - Filters rewrite rules used for "page" post type archives.
- [`post_comments_feed_link`](https://developer.wordpress.org/reference/hooks/post_comments_feed_link/) (1.5.1) - Filters the post comments feed permalink.
- [`post_link`](https://developer.wordpress.org/reference/hooks/post_link/) - Filters the permalink for a post.
- [`post_rewrite_rules`](https://developer.wordpress.org/reference/hooks/post_rewrite_rules/) - Filters rewrite rules used for "post" archives.
- [`posts_join`](https://developer.wordpress.org/reference/hooks/posts_join/) - Filters the JOIN clause of the query.
- [`posts_join_paged`](https://developer.wordpress.org/reference/hooks/posts_join_paged/) - Filters the JOIN clause of the query.
- [`posts_orderby`](https://developer.wordpress.org/reference/hooks/posts_orderby/) (1.5.1) - Filters the ORDER BY clause of the query.
- [`posts_where`](https://developer.wordpress.org/reference/hooks/posts_where/) - Filters the WHERE clause of the query.
- [`posts_where_paged`](https://developer.wordpress.org/reference/hooks/posts_where_paged/) - Filters the WHERE clause of the query.
- [`pre_comment_author_email`](https://developer.wordpress.org/reference/hooks/pre_comment_author_email/) - Filters the comment author's email cookie before it is set.
- [`pre_comment_author_name`](https://developer.wordpress.org/reference/hooks/pre_comment_author_name/) - Filters the comment author's name cookie before it is set.
- [`pre_comment_author_url`](https://developer.wordpress.org/reference/hooks/pre_comment_author_url/) - Filters the comment author's URL cookie before it is set.
- [`pre_comment_content`](https://developer.wordpress.org/reference/hooks/pre_comment_content/) - Filters the comment content before it is set.
- [`pre_comment_user_agent`](https://developer.wordpress.org/reference/hooks/pre_comment_user_agent/) - Filters the comment author's browser user agent before it is set.
- [`pre_comment_user_ip`](https://developer.wordpress.org/reference/hooks/pre_comment_user_ip/) - Filters the comment author's IP address before it is set.
- [`pre_option_{$option}`](https://developer.wordpress.org/reference/hooks/pre_option_option/) - Filters the value of an existing option before it is retrieved.
- [`pre_user_id`](https://developer.wordpress.org/reference/hooks/pre_user_id/) - Filters the comment author's user ID before it is set.
- [`preprocess_comment`](https://developer.wordpress.org/reference/hooks/preprocess_comment/) - Filters a comment's data before it is sanitized and inserted into the database.
- [`query_vars`](https://developer.wordpress.org/reference/hooks/query_vars/) - Filters the query variables allowed before processing.
- [`register`](https://developer.wordpress.org/reference/hooks/register/) - Filters the HTML link to the Registration or Admin page.
- [`rewrite_rules_array`](https://developer.wordpress.org/reference/hooks/rewrite_rules_array/) - Filters the full set of generated rewrite rules.
- [`root_rewrite_rules`](https://developer.wordpress.org/reference/hooks/root_rewrite_rules/) - Filters rewrite rules used for root-level archives.
- [`search_rewrite_rules`](https://developer.wordpress.org/reference/hooks/search_rewrite_rules/) - Filters rewrite rules used for search archives.
- [`show_password_fields`](https://developer.wordpress.org/reference/hooks/show_password_fields/) (1.5.1) - Filters the display of the password fields.
- [`stylesheet`](https://developer.wordpress.org/reference/hooks/stylesheet/) - Filters the name of current stylesheet.
- [`stylesheet_directory`](https://developer.wordpress.org/reference/hooks/stylesheet_directory/) - Filters the stylesheet directory path for the active theme.
- [`stylesheet_directory_uri`](https://developer.wordpress.org/reference/hooks/stylesheet_directory_uri/) - Filters the stylesheet directory URI.
- [`stylesheet_uri`](https://developer.wordpress.org/reference/hooks/stylesheet_uri/) - Filters the URI of the active theme stylesheet.
- [`template`](https://developer.wordpress.org/reference/hooks/template/) - Filters the name of the active theme.
- [`template_directory`](https://developer.wordpress.org/reference/hooks/template_directory/) - Filters the active theme directory path.
- [`template_directory_uri`](https://developer.wordpress.org/reference/hooks/template_directory_uri/) - Filters the active theme directory URI.
- [`the_permalink`](https://developer.wordpress.org/reference/hooks/the_permalink/) - Filters the display of the permalink for the current post.
- [`the_posts`](https://developer.wordpress.org/reference/hooks/the_posts/) - Filters the array of retrieved posts after they've been fetched and internally processed.
- [`theme_root`](https://developer.wordpress.org/reference/hooks/theme_root/) - Filters the absolute path to the themes directory.
- [`theme_root_uri`](https://developer.wordpress.org/reference/hooks/theme_root_uri/) - Filters the URI for themes directory.
- [`wp_list_pages`](https://developer.wordpress.org/reference/hooks/wp_list_pages/) (1.5.1) - Filters the HTML output of the pages to list.
- [`xmlrpc_methods`](https://developer.wordpress.org/reference/hooks/xmlrpc_methods/) - Filters the methods exposed by the XML-RPC server.
- [`year_link`](https://developer.wordpress.org/reference/hooks/year_link/) - Filters the year archive permalink.
- [`{$type}_template`](https://developer.wordpress.org/reference/hooks/type_template/) - Filters the path of the queried template by type.

### Changes

- [`option_{$option}`](https://developer.wordpress.org/reference/hooks/option_option/) - As <code>option_{$setting}</code>.

## WordPress 1.2

### New Actions

- [`admin_footer`](https://developer.wordpress.org/reference/hooks/admin_footer/) - Prints scripts or data before the default footer scripts.
- [`comment_post`](https://developer.wordpress.org/reference/hooks/comment_post/) - Fires immediately after a comment is inserted into the database.
- [`delete_comment`](https://developer.wordpress.org/reference/hooks/delete_comment/) - Fires immediately before a comment is deleted from the database.
- [`delete_post`](https://developer.wordpress.org/reference/hooks/delete_post/) - Fires immediately before a post is deleted from the database.
- [`edit_comment`](https://developer.wordpress.org/reference/hooks/edit_comment/) - Fires immediately after a comment is updated in the database.
- [`edit_post`](https://developer.wordpress.org/reference/hooks/edit_post/) - Fires once an existing post has been updated.
- [`publish_phone`](https://developer.wordpress.org/reference/hooks/publish_phone/) - Fires after a post submitted by email is published.
- [`shutdown`](https://developer.wordpress.org/reference/hooks/shutdown/) - Fires just before PHP shuts down execution.
- [`trackback_post`](https://developer.wordpress.org/reference/hooks/trackback_post/) - Fires after a trackback is added to a post.

### New Filters

- [`author_email`](https://developer.wordpress.org/reference/hooks/author_email/) - Filters the comment author's email for display.
- [`category_description`](https://developer.wordpress.org/reference/hooks/category_description/) - Filters the category description for display.
- [`comment_author`](https://developer.wordpress.org/reference/hooks/comment_author/) - Filters the comment author's name for display.
- [`comment_email`](https://developer.wordpress.org/reference/hooks/comment_email/) - Filters the comment author's email for display.
- [`comment_excerpt`](https://developer.wordpress.org/reference/hooks/comment_excerpt/) - Filters the comment excerpt for display.
- [`comment_text`](https://developer.wordpress.org/reference/hooks/comment_text/) - Filters the text of a comment to be displayed.
- [`comment_url`](https://developer.wordpress.org/reference/hooks/comment_url/) - Filters the comment author's URL for display.
- [`format_to_edit`](https://developer.wordpress.org/reference/hooks/format_to_edit/) - Filters the text to be formatted for editing.
- [`get_the_excerpt`](https://developer.wordpress.org/reference/hooks/get_the_excerpt/) - Filters the retrieved post excerpt.
- [`list_cats`](https://developer.wordpress.org/reference/hooks/list_cats/) - Filters a taxonomy drop-down display element.
- [`phone_content`](https://developer.wordpress.org/reference/hooks/phone_content/) - Filters the content of the post submitted by email before saving.
- [`sanitize_title`](https://developer.wordpress.org/reference/hooks/sanitize_title/) - Filters a sanitized title string.
- [`the_category`](https://developer.wordpress.org/reference/hooks/the_category/) - Filters the category or list of categories.
- [`the_category_rss`](https://developer.wordpress.org/reference/hooks/the_category_rss/) - Filters all of the post categories for display in a feed.
- [`the_excerpt_rss`](https://developer.wordpress.org/reference/hooks/the_excerpt_rss/) - Filters the post excerpt for a feed.
- [`the_title_rss`](https://developer.wordpress.org/reference/hooks/the_title_rss/) - Filters the post title for use in a feed.

### Changes

_No changes in this version._

## WordPress 0.71

### New Actions

- [`pingback_post`](https://developer.wordpress.org/reference/hooks/pingback_post/) - Fires after a post pingback has been sent.

### New Filters

- [`bloginfo`](https://developer.wordpress.org/reference/hooks/bloginfo/) - Filters the site information returned by get_bloginfo().
- [`single_post_title`](https://developer.wordpress.org/reference/hooks/single_post_title/) - Filters the page title for a single post.
- [`the_content`](https://developer.wordpress.org/reference/hooks/the_content/) - Filters the post content.
- [`the_date`](https://developer.wordpress.org/reference/hooks/the_date/) - Filters the date of the post, for display.
- [`the_excerpt`](https://developer.wordpress.org/reference/hooks/the_excerpt/) - Filters the displayed post excerpt.
- [`the_time`](https://developer.wordpress.org/reference/hooks/the_time/) - Filters the time of the post, for display.
- [`the_title`](https://developer.wordpress.org/reference/hooks/the_title/) - Filters the post title.
- [`the_weekday`](https://developer.wordpress.org/reference/hooks/the_weekday/) - Filters the localized weekday of the post, for display.
- [`the_weekday_date`](https://developer.wordpress.org/reference/hooks/the_weekday_date/) - Filters the localized weekday of the post, for display.

### Changes

_No changes in this version._