Question

do_action( string $tag,  $arg = '' )

Execute functions hooked on a specific action hook.

---

description

This function invokes all functions attached to action hook $tag. It is possible to create new action hooks by simply calling this function, specifying the name of the new hook using the $tag parameter.

You can pass extra arguments to the hooks, much like you can with apply_filters().

---

参数

$tag

(string) (Required) The name of the action to be executed.

$arg,...

(mixed) (Optional) Additional arguments which are passed on to the functions hooked to the action. Default empty.

---

源代码

File: wp-includes/plugin.php

function do_action($tag, $arg = '') {
	global $wp_filter, $wp_actions, $wp_current_filter;

	if ( ! isset($wp_actions[$tag]) )
		$wp_actions[$tag] = 1;
	else
		++$wp_actions[$tag];

	// Do 'all' actions first
	if ( isset($wp_filter['all']) ) {
		$wp_current_filter[] = $tag;
		$all_args = func_get_args();
		_wp_call_all_hook($all_args);
	}

	if ( !isset($wp_filter[$tag]) ) {
		if ( isset($wp_filter['all']) )
			array_pop($wp_current_filter);
		return;
	}

	if ( !isset($wp_filter['all']) )
		$wp_current_filter[] = $tag;

	$args = array();
	if ( is_array($arg) && 1 == count($arg) && isset($arg[0]) && is_object($arg[0]) ) // array(&$this)
		$args[] =& $arg[0];
	else
		$args[] = $arg;
	for ( $a = 2, $num = func_num_args(); $a < $num; $a++ )
		$args[] = func_get_arg($a);

	$wp_filter[ $tag ]->do_action( $args );

	array_pop($wp_current_filter);
}

---

更新日志

Version	description
1.2.0	Introduced.

---

相关函数

Uses

• wp-includes/plugin.php: _wp_call_all_hook()

---

Used By

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• wp-includes/rest-api/endpoints/class-wp-rest-revisions-controller.php: WP_REST_Revisions_Controller::delete_item()
• wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::create_item()
• wp-includes/rest-api/endpoints/class-wp-rest-attachments-controller.php: WP_REST_Attachments_Controller::update_item()
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• wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::create_item()
• wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::update_item()
• wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php: WP_REST_Posts_Controller::delete_item()
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• wp-includes/theme.php: check_theme_switched()
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• wp-includes/general-template.php: get_template_part()
• wp-includes/general-template.php: get_search_form()
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• wp-includes/class-wp-query.php: WP_Query::get_posts()
• wp-includes/class-wp-query.php: WP_Query::parse_tax_query()
• wp-includes/load.php: shutdown_action_hook()
• wp-includes/class-http.php: WP_Http::_dispatch_request()
• wp-includes/functions.wp-scripts.php: wp_print_scripts()
• wp-includes/class-http.php: WP_Http::request()
• wp-includes/functions.php: _deprecated_function()
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• wp-includes/functions.php: _deprecated_argument()
• wp-includes/functions.php: _doing_it_wrong()
• wp-includes/functions.php: do_robots()
• wp-includes/functions.php: do_feed()
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• wp-includes/class-wp-customize-section.php: WP_Customize_Section::maybe_render()
• wp-includes/taxonomy.php: _update_post_term_count()
• wp-includes/taxonomy.php: _update_generic_term_count()
• wp-includes/taxonomy.php: clean_object_term_cache()
• wp-includes/taxonomy.php: clean_term_cache()
• wp-includes/taxonomy.php: wp_update_term()
• wp-includes/taxonomy.php: wp_insert_term()
• wp-includes/taxonomy.php: wp_set_object_terms()
• wp-includes/taxonomy.php: wp_remove_object_terms()
• wp-includes/taxonomy.php: wp_delete_term()
• wp-includes/taxonomy.php: register_taxonomy()
• wp-includes/class-wp-admin-bar.php: WP_Admin_Bar::add_menus()
• wp-includes/class-wp-admin-bar.php: WP_Admin_Bar::initialize()
• wp-includes/update.php: wp_version_check()
• wp-includes/functions.wp-styles.php: wp_print_styles()
• wp-includes/admin-bar.php: wp_admin_bar_render()
• wp-includes/option.php: set_site_transient()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::preview()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::save()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::update()
• wp-includes/option.php: delete_site_transient()
• wp-includes/option.php: set_transient()
• wp-includes/option.php: update_option()
• wp-includes/option.php: add_option()
• wp-includes/option.php: delete_option()
• wp-includes/option.php: delete_transient()
• wp-includes/class-wp-user-query.php: WP_User_Query::prepare_query()
• wp-includes/user.php: reset_password()
• wp-includes/user.php: register_new_user()
• wp-includes/user.php: clean_user_cache()
• wp-includes/user.php: wp_insert_user()
• wp-includes/user.php: wp_signon()
• wp-includes/post-thumbnail-template.php: get_the_post_thumbnail()
• wp-includes/media.php: wp_enqueue_media()
• wp-includes/media.php: wp_playlist_shortcode()
• wp-includes/post.php: clean_post_cache()
• wp-includes/post.php: clean_attachment_cache()
• wp-includes/post.php: _transition_post_status()
• wp-includes/post.php: _publish_post_hook()
• wp-includes/post.php: wp_delete_attachment()
• wp-includes/post.php: wp_publish_post()
• wp-includes/post.php: wp_transition_post_status()
• wp-includes/post.php: wp_untrash_post_comments()
• wp-includes/post.php: wp_insert_post()
• wp-includes/post.php: wp_delete_post()
• wp-includes/post.php: wp_trash_post()
• wp-includes/post.php: wp_untrash_post()
• wp-includes/post.php: wp_trash_post_comments()
• wp-includes/post.php: stick_post()
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• wp-includes/class-wp-rewrite.php: WP_Rewrite::set_permalink_structure()
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• wp-includes/revision.php: wp_restore_post_revision()
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• wp-includes/ms-functions.php: add_existing_user_to_blog()
• wp-includes/ms-functions.php: wpmu_activate_signup()
• wp-includes/ms-functions.php: wpmu_create_user()
• wp-includes/ms-functions.php: wpmu_create_blog()
• wp-includes/ms-functions.php: wpmu_signup_blog()
• wp-includes/ms-functions.php: wpmu_signup_user()
• wp-includes/ms-functions.php: add_user_to_blog()
• wp-includes/ms-functions.php: remove_user_from_blog()
• wp-includes/ms-blogs.php: switch_to_blog()
• wp-includes/ms-blogs.php: restore_current_blog()
• wp-includes/ms-blogs.php: update_blog_status()
• wp-includes/ms-blogs.php: refresh_blog_details()
• wp-includes/ms-blogs.php: update_blog_details()
• wp-includes/ms-blogs.php: clean_blog_cache()
• wp-includes/ms-blogs.php: wpmu_update_blogs_date()
• wp-includes/nav-menu.php: wp_delete_nav_menu()
• wp-includes/nav-menu.php: wp_update_nav_menu_object()
• wp-includes/nav-menu.php: wp_update_nav_menu_item()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_getPostCategories()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_setPostCategories()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_supportedMethods()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_supportedTextFilters()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_getTrackbackPings()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_publishPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::pingback_ping()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::pingback_extensions_getPingbacks()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_editPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_getPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_getRecentPosts()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_getCategories()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_newMediaObject()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_getRecentPostTitles()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_getCategoryList()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_getUserInfo()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_getPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_getRecentPosts()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_newPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_editPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_deletePost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_newPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getMediaItem()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getMediaLibrary()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPostFormats()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPostType()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPostTypes()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getRevisions()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_restoreRevision()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::blogger_getUsersBlogs()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getComments()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deleteComment()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editComment()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newComment()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getCommentStatusList()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getCommentCount()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPostStatusList()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPageStatusList()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPages()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newPage()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deletePage()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editPage()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPageList()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getAuthors()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTags()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newCategory()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deleteCategory()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_suggestCategories()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getComment()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPosts()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newTerm()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editTerm()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deleteTerm()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTerm()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTerms()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTaxonomy()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTaxonomies()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getUser()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getUsers()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getProfile()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editProfile()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPage()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deletePost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getUsersBlogs()
• wp-includes/class-wp-customize-control.php: WP_Customize_Control::maybe_render()
• wp-includes/widgets.php: dynamic_sidebar()
• wp-includes/widgets.php: the_widget()
• wp-includes/widgets.php: register_sidebar()
• wp-includes/widgets.php: wp_register_sidebar_widget()
• wp-includes/widgets.php: wp_unregister_sidebar_widget()
• wp-includes/comment-template.php: comment_form()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::wp_ajax_update_widget()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::print_styles()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::print_scripts()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::enqueue_scripts()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::print_footer_scripts()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::customize_controls_init()
• wp-includes/script-loader.php: print_head_scripts()
• wp-includes/script-loader.php: wp_print_head_scripts()
• wp-includes/script-loader.php: wp_print_footer_scripts()
• wp-includes/script-loader.php: wp_enqueue_scripts()
• wp-includes/comment.php: clean_comment_cache()
• wp-includes/comment.php: wp_new_comment()
• wp-includes/comment.php: wp_set_comment_status()
• wp-includes/comment.php: wp_update_comment()
• wp-includes/comment.php: wp_update_comment_count_now()
• wp-includes/comment.php: wp_spam_comment()
• wp-includes/comment.php: wp_unspam_comment()
• wp-includes/comment.php: wp_transition_comment_status()
• wp-includes/comment.php: wp_insert_comment()
• wp-includes/comment.php: wp_blacklist_check()
• wp-includes/comment.php: wp_delete_comment()
• wp-includes/comment.php: wp_trash_comment()
• wp-includes/comment.php: wp_untrash_comment()
• wp-includes/comment.php: wp_allow_comment()
• wp-includes/meta.php: delete_metadata()
• wp-includes/meta.php: update_metadata_by_mid()
• wp-includes/meta.php: delete_metadata_by_mid()
• wp-includes/meta.php: add_metadata()
• wp-includes/meta.php: update_metadata()
• wp-includes/class-wp-editor.php: _WP_Editors::enqueue_scripts()
• wp-includes/class-wp-editor.php: _WP_Editors::editor_js()
• wp-includes/media-template.php: wp_print_media_templates()
• wp-includes/class-wp-editor.php: _WP_Editors::editor()
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User Contributed Notes

1. Skip to note content You must log in to vote on the helpfulness of this noteVote results for this note: 11You must log in to vote on the helpfulness of this note Contributed by Codex

   Example

   
   # ======= Somewhere in a (mu-)plugin, theme or the core =======

   Result:

   
   Array ( 
   	['eye patch'] => 'yes'
   	['parrot'] => true
   	['wooden leg'] => 1
   )
   And hook said: "I ate ice cream with Peter Pan."