Question

apply_filters( string $tag,  mixed $value )

Call the functions added to a filter hook.

---

description

The callback functions attached to filter hook $tag are invoked by calling this function. This function can be used to create a new filter hook by simply calling this function with the name of the new hook specified using the $tag parameter.

The function allows for additional arguments to be added and passed to hooks.

// Our filter callback function
function example_callback( $string, $arg1, $arg2 ) {
    // (maybe) modify $string
    return $string;
}
add_filter( 'example_filter', 'example_callback', 10, 3 );

/*
 * Apply the filters by calling the 'example_callback' function we
 * "hooked" to 'example_filter' using the add_filter() function above.
 * - 'example_filter' is the filter hook $tag
 * - 'filter me' is the value being filtered
 * - $arg1 and $arg2 are the additional arguments passed to the callback.
$value = apply_filters( 'example_filter', 'filter me', $arg1, $arg2 );

---

参数

$tag

(string) (Required) The name of the filter hook.

$value

(mixed) (Required) The value on which the filters hooked to $tag are applied on.

$var,...

(mixed) (Required) Additional variables passed to the functions hooked to $tag.

---

返回值

(mixed) The filtered value after all hooked functions are applied to it.

---

源代码

File: wp-includes/plugin.php

function apply_filters( $tag, $value ) {
	global $wp_filter, $wp_current_filter;

	$args = array();

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

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

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

	if ( empty($args) )
		$args = func_get_args();

	// don't pass the tag name to WP_Hook
	array_shift( $args );

	$filtered = $wp_filter[ $tag ]->apply_filters( $value, $args );

	array_pop( $wp_current_filter );

	return $filtered;
}

---

更新日志

Version	description
0.71	Introduced.

---

相关函数

Uses

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

---

Used By

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• wp-admin/includes/taxonomy.php: get_terms_to_edit()
• wp-admin/includes/class-wp-theme-install-list-table.php: WP_Theme_Install_List_Table::prepare_items()
• wp-admin/includes/class-wp-theme-install-list-table.php: WP_Theme_Install_List_Table::single_row()
• wp-admin/includes/update.php: update_right_now_message()
• wp-admin/includes/image.php: wp_generate_attachment_metadata()
• wp-admin/includes/image.php: wp_read_image_metadata()
• wp-admin/includes/image.php: file_is_displayable_image()
• wp-admin/includes/image.php: load_image_to_edit()
• wp-admin/includes/image.php: _load_image_to_edit_path()
• wp-admin/includes/plugin-install.php: plugins_api()
• wp-admin/includes/dashboard.php: wp_dashboard_recent_posts()
• wp-admin/includes/dashboard.php: wp_dashboard_primary()
• wp-admin/includes/dashboard.php: wp_dashboard_browser_nag()
• wp-admin/includes/dashboard.php: wp_dashboard_quick_press()
• wp-admin/includes/dashboard.php: wp_dashboard_recent_drafts()
• wp-admin/includes/dashboard.php: _wp_dashboard_recent_comments_row()
• wp-admin/includes/dashboard.php: wp_dashboard_right_now()
• wp-admin/includes/dashboard.php: wp_dashboard_setup()
• wp-admin/includes/upgrade.php: dbDelta()
• wp-includes/option.php: register_setting()
• wp-admin/includes/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::display_rows()
• wp-admin/includes/user.php: edit_user()
• wp-admin/includes/user.php: get_editable_roles()
• wp-admin/includes/user.php: get_users_drafts()
• wp-admin/includes/user.php: wp_delete_user()
• wp-admin/includes/class-wp-plugin-install-list-table.php: WP_Plugin_Install_List_Table::prepare_items()
• wp-admin/includes/class-walker-category-checklist.php: Walker_Category_Checklist::start_el()
• wp-admin/includes/template.php: iframe_header()
• wp-admin/includes/template.php: _post_states()
• wp-admin/includes/template.php: _media_states()
• wp-admin/includes/template.php: get_inline_data()
• wp-admin/includes/template.php: wp_comment_reply()
• wp-admin/includes/template.php: meta_form()
• wp-admin/includes/template.php: wp_import_upload_form()
• wp-admin/includes/class-wp-themes-list-table.php: WP_Themes_List_Table::display_rows()
• wp-admin/includes/template.php: wp_terms_checklist()
• wp-admin/includes/template.php: wp_popular_terms_checklist()
• wp-admin/includes/template.php: wp_link_category_checklist()
• wp-admin/includes/class-wp-ms-sites-list-table.php: WP_MS_Sites_List_Table::prepare_items()
• wp-admin/includes/class-wp-ms-sites-list-table.php: WP_MS_Sites_List_Table::get_columns()
• wp-admin/includes/class-wp-users-list-table.php: WP_Users_List_Table::single_row()
• wp-admin/includes/class-wp-users-list-table.php: WP_Users_List_Table::prepare_items()
• wp-admin/includes/media.php: media_upload_type_form()
• wp-admin/includes/media.php: media_upload_type_url_form()
• wp-admin/includes/media.php: media_upload_gallery_form()
• wp-admin/includes/media.php: media_upload_library_form()
• wp-admin/includes/media.php: wp_media_insert_url_form()
• wp-admin/includes/media.php: attachment_submitbox_metadata()
• wp-admin/includes/media.php: get_attachment_fields_to_edit()
• wp-admin/includes/media.php: get_media_item()
• wp-admin/includes/media.php: get_compat_media_markup()
• wp-admin/includes/media.php: media_upload_form()
• wp-admin/includes/media.php: media_upload_form_handler()
• wp-admin/includes/media.php: wp_media_upload_handler()
• wp-admin/includes/media.php: image_size_input_fields()
• wp-admin/includes/media.php: the_media_upload_tabs()
• wp-admin/includes/media.php: get_image_send_to_editor()
• wp-admin/includes/media.php: image_add_caption()
• wp-admin/includes/media.php: media_buttons()
• wp-admin/includes/media.php: get_upload_iframe_src()
• wp-admin/includes/post.php: get_sample_permalink_html()
• wp-admin/includes/post.php: _wp_post_thumbnail_html()
• wp-admin/includes/post.php: wp_check_post_lock()
• wp-admin/includes/post.php: _admin_notice_post_locked()
• wp-admin/includes/media.php: media_upload_tabs()
• wp-admin/includes/post.php: wp_edit_posts_query()
• wp-admin/includes/post.php: postbox_classes()
• wp-admin/includes/post.php: get_sample_permalink()
• wp-admin/includes/ajax-actions.php: wp_ajax_send_attachment_to_editor()
• wp-admin/includes/ajax-actions.php: wp_ajax_send_link_to_editor()
• wp-admin/includes/ajax-actions.php: wp_ajax_heartbeat()
• wp-admin/includes/ajax-actions.php: wp_ajax_query_themes()
• wp-admin/includes/post.php: edit_post()
• wp-admin/includes/post.php: get_default_post_to_edit()
• wp-admin/includes/ajax-actions.php: wp_ajax_wp_remove_post_lock()
• wp-admin/includes/ajax-actions.php: wp_ajax_query_attachments()
• wp-admin/includes/ajax-actions.php: wp_ajax_save_attachment_compat()
• wp-admin/includes/ajax-actions.php: wp_ajax_add_menu_item()
• wp-admin/includes/ajax-actions.php: wp_ajax_menu_get_metabox()
• wp-admin/includes/ajax-actions.php: wp_ajax_inline_save()
• wp-admin/includes/update-core.php: update_core()
• wp-admin/includes/revision.php: wp_get_revision_ui_diff()
• wp-admin/includes/revision.php: wp_prepare_revisions_for_js()
• wp-admin/includes/ajax-actions.php: wp_ajax_nopriv_heartbeat()
• wp-admin/includes/ajax-actions.php: wp_ajax_ajax_tag_search()
• wp-admin/includes/ajax-actions.php: wp_ajax_autocomplete_user()
• wp-admin/includes/meta-boxes.php: post_slug_meta_box()
• wp-admin/includes/meta-boxes.php: page_attributes_meta_box()
• wp-admin/includes/meta-boxes.php: post_categories_meta_box()
• wp-admin/includes/menu.php: add_menu_classes()
• wp-admin/includes/class-wp-media-list-table.php: WP_Media_List_Table::get_columns()
• wp-admin/includes/class-wp-media-list-table.php: WP_Media_List_Table::_get_row_actions()
• wp-admin/includes/class-wp-comments-list-table.php: WP_Comments_List_Table::column_author()
• wp-admin/includes/class-wp-comments-list-table.php: WP_Comments_List_Table::get_views()
• wp-admin/includes/class-wp-comments-list-table.php: WP_Comments_List_Table::extra_tablenav()
• wp-admin/includes/class-wp-comments-list-table.php: WP_Comments_List_Table::column_comment()
• wp-admin/includes/class-wp-terms-list-table.php: WP_Terms_List_Table::column_name()
• wp-admin/includes/class-wp-terms-list-table.php: WP_Terms_List_Table::column_slug()
• wp-admin/includes/class-wp-terms-list-table.php: WP_Terms_List_Table::column_default()
• wp-admin/includes/class-wp-comments-list-table.php: WP_Comments_List_Table::get_per_page()
• wp-admin/includes/class-wp-terms-list-table.php: WP_Terms_List_Table::prepare_items()
• wp-admin/includes/class-walker-nav-menu-checklist.php: Walker_Nav_Menu_Checklist::start_el()
• wp-admin/includes/nav-menu.php: wp_nav_menu_post_type_meta_boxes()
• wp-admin/includes/nav-menu.php: wp_nav_menu_taxonomy_meta_boxes()
• wp-admin/includes/nav-menu.php: wp_nav_menu_item_post_type_meta_box()
• wp-admin/includes/nav-menu.php: wp_get_nav_menu_to_edit()
• wp-admin/includes/file.php: get_filesystem_method()
• wp-admin/includes/file.php: request_filesystem_credentials()
• wp-admin/includes/file.php: unzip_file()
• wp-admin/includes/file.php: WP_Filesystem()
• wp-admin/includes/class-wp-posts-list-table.php: WP_Posts_List_Table::inline_edit()
• wp-admin/includes/class-wp-posts-list-table.php: WP_Posts_List_Table::get_columns()
• wp-admin/includes/comment.php: get_comment_to_edit()
• wp-admin/includes/class-wp-posts-list-table.php: WP_Posts_List_Table::prepare_items()
• wp-admin/custom-header.php: Custom_Image_Header::insert_attachment()
• wp-admin/custom-header.php: Custom_Image_Header::ajax_header_crop()
• wp-admin/custom-header.php: Custom_Image_Header::step_2()
• wp-admin/custom-header.php: Custom_Image_Header::step_3()
• wp-admin/includes/post.php: redirect_post()
• wp-admin/custom-background.php: Custom_Background::wp_set_background_image()
• wp-includes/class-wp-user.php: WP_User::has_cap()
• wp-includes/class-wp-role.php: WP_Role::has_cap()
• wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::add_setting()
• wp-includes/capabilities.php: map_meta_cap()
• wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::save()
• wp-includes/class.wp-styles.php: WP_Styles::all_deps()
• wp-includes/class.wp-styles.php: WP_Styles::_css_href()
• wp-includes/class-wp-customize-manager.php: WP_Customize_Manager::__construct()
• wp-includes/cron.php: wp_schedule_event()
• wp-includes/cron.php: spawn_cron()
• wp-includes/cron.php: wp_get_schedules()
• wp-includes/class.wp-styles.php: WP_Styles::do_item()
• wp-includes/cron.php: wp_schedule_single_event()
• wp-includes/category-template.php: get_the_term_list()
• wp-includes/category-template.php: the_terms()
• wp-includes/class-walker-category.php: Walker_Category::start_el()
• wp-includes/class-walker-category-dropdown.php: Walker_CategoryDropdown::start_el()
• wp-includes/category-template.php: wp_tag_cloud()
• wp-includes/category-template.php: wp_generate_tag_cloud()
• wp-includes/category-template.php: get_the_tags()
• wp-includes/category-template.php: get_the_tag_list()
• wp-includes/category-template.php: get_the_terms()
• wp-includes/category-template.php: get_the_category()
• wp-includes/category-template.php: get_the_category_list()
• wp-includes/category-template.php: wp_dropdown_categories()
• wp-includes/category-template.php: wp_list_categories()
• wp-includes/theme.php: current_theme_supports()
• wp-includes/theme.php: set_theme_mod()
• wp-includes/theme.php: get_theme_root()
• wp-includes/theme.php: get_theme_root_uri()
• wp-includes/theme.php: validate_current_theme()
• wp-includes/theme.php: get_theme_mod()
• wp-includes/theme.php: get_stylesheet_directory()
• wp-includes/theme.php: get_stylesheet_directory_uri()
• wp-includes/theme.php: get_stylesheet_uri()
• wp-includes/theme.php: get_locale_stylesheet_uri()
• wp-includes/theme.php: get_template()
• wp-includes/theme.php: get_template_directory()
• wp-includes/theme.php: get_template_directory_uri()
• wp-includes/theme.php: search_theme_directories()
• wp-includes/theme.php: get_stylesheet()
• wp-includes/l10n.php: get_available_languages()
• wp-includes/l10n.php: load_textdomain()
• wp-includes/l10n.php: unload_textdomain()
• wp-includes/l10n.php: load_plugin_textdomain()
• wp-includes/l10n.php: load_muplugin_textdomain()
• wp-includes/l10n.php: load_theme_textdomain()
• wp-includes/l10n.php: translate()
• wp-includes/l10n.php: translate_with_gettext_context()
• wp-includes/l10n.php: _n()
• wp-includes/l10n.php: _nx()
• wp-includes/formatting.php: sanitize_text_field()
• wp-includes/formatting.php: sanitize_mime_type()
• wp-includes/formatting.php: sanitize_trackback_urls()
• wp-includes/l10n.php: get_locale()
• wp-includes/formatting.php: esc_textarea()
• wp-includes/formatting.php: tag_escape()
• wp-includes/formatting.php: sanitize_option()
• wp-includes/formatting.php: wp_parse_str()
• wp-includes/formatting.php: wp_sprintf()
• wp-includes/formatting.php: wp_sprintf_l()
• wp-includes/deprecated.php: wp_htmledit_pre()
• wp-includes/formatting.php: esc_url()
• wp-includes/formatting.php: esc_js()
• wp-includes/formatting.php: esc_html()
• wp-includes/formatting.php: esc_attr()
• wp-includes/formatting.php: sanitize_email()
• wp-includes/formatting.php: human_time_diff()
• wp-includes/formatting.php: wp_trim_excerpt()
• wp-includes/formatting.php: wp_trim_words()
• wp-includes/formatting.php: ent2ncr()
• wp-includes/deprecated.php: wp_richedit_pre()
• wp-includes/formatting.php: translate_smiley()
• wp-includes/formatting.php: is_email()
• wp-includes/formatting.php: sanitize_file_name()
• wp-includes/formatting.php: sanitize_user()
• wp-includes/formatting.php: sanitize_key()
• wp-includes/formatting.php: sanitize_title()
• wp-includes/formatting.php: sanitize_html_class()
• wp-includes/formatting.php: format_to_edit()
• wp-includes/pluggable.php: get_avatar()
• wp-includes/formatting.php: wptexturize()
• wp-includes/pluggable.php: wp_nonce_tick()
• wp-includes/pluggable.php: wp_verify_nonce()
• wp-includes/pluggable.php: wp_create_nonce()
• wp-includes/pluggable.php: wp_salt()
• wp-includes/pluggable.php: wp_check_password()
• wp-includes/pluggable.php: wp_generate_password()
• wp-includes/pluggable.php: wp_redirect()
• wp-includes/pluggable.php: wp_safe_redirect()
• wp-includes/pluggable.php: wp_validate_redirect()
• wp-includes/pluggable.php: wp_notify_postauthor()
• wp-includes/pluggable.php: wp_notify_moderator()
• wp-includes/pluggable.php: wp_set_auth_cookie()
• wp-includes/pluggable.php: wp_clear_auth_cookie()
• wp-includes/pluggable.php: auth_redirect()
• wp-includes/pluggable.php: wp_authenticate()
• wp-includes/pluggable.php: wp_generate_auth_cookie()
• wp-includes/pluggable.php: wp_mail()
• wp-includes/general-template.php: the_search_query()
• wp-includes/general-template.php: paginate_links()
• wp-includes/general-template.php: wp_admin_css_uri()
• wp-includes/general-template.php: wp_admin_css()
• wp-includes/general-template.php: wp_generator()
• wp-includes/general-template.php: the_generator()
• wp-includes/general-template.php: get_the_generator()
• wp-includes/general-template.php: feed_links()
• wp-includes/general-template.php: user_can_richedit()
• wp-includes/general-template.php: wp_default_editor()
• wp-includes/general-template.php: get_search_query()
• wp-includes/general-template.php: get_the_modified_date()
• wp-includes/general-template.php: the_time()
• wp-includes/general-template.php: get_the_time()
• wp-includes/general-template.php: get_post_time()
• wp-includes/general-template.php: the_modified_time()
• wp-includes/general-template.php: get_the_modified_time()
• wp-includes/general-template.php: get_post_modified_time()
• wp-includes/general-template.php: the_weekday()
• wp-includes/general-template.php: the_weekday_date()
• wp-includes/general-template.php: get_archives_link()
• wp-includes/general-template.php: wp_get_archives()
• wp-includes/general-template.php: get_calendar()
• wp-includes/general-template.php: the_date()
• wp-includes/general-template.php: get_the_date()
• wp-includes/general-template.php: the_modified_date()
• wp-includes/general-template.php: get_bloginfo()
• wp-includes/general-template.php: wp_title()
• wp-includes/general-template.php: single_post_title()
• wp-includes/general-template.php: post_type_archive_title()
• wp-includes/general-template.php: single_term_title()
• wp-includes/general-template.php: wp_loginout()
• wp-includes/general-template.php: wp_logout_url()
• wp-includes/general-template.php: wp_login_url()
• wp-includes/general-template.php: wp_registration_url()
• wp-includes/general-template.php: wp_login_form()
• wp-includes/general-template.php: wp_lostpassword_url()
• wp-includes/general-template.php: wp_register()
• wp-includes/general-template.php: get_search_form()
• wp-includes/deprecated.php: get_theme_data()
• wp-includes/deprecated.php: get_boundary_post_rel_link()
• wp-includes/deprecated.php: get_index_rel_link()
• wp-includes/deprecated.php: get_parent_post_rel_link()
• wp-includes/deprecated.php: get_attachment_icon_src()
• wp-includes/deprecated.php: get_attachment_icon()
• wp-includes/deprecated.php: get_attachment_innerHTML()
• wp-includes/deprecated.php: the_content_rss()
• wp-includes/deprecated.php: get_links_list()
• wp-includes/kses.php: safecss_filter_attr()
• wp-includes/deprecated.php: previous_post()
• wp-includes/deprecated.php: next_post()
• wp-includes/class-wp-theme.php: WP_Theme::get_allowed()
• wp-includes/class-wp-theme.php: WP_Theme::get_allowed_on_network()
• wp-includes/class-wp-theme.php: WP_Theme::get_allowed_on_site()
• wp-includes/kses.php: wp_kses_allowed_html()
• wp-includes/kses.php: wp_kses_hook()
• wp-includes/class-wp-theme.php: WP_Theme::get_page_templates()
• wp-includes/class-wp-theme.php: WP_Theme::scandir()
• wp-includes/class-wp.php: WP::handle_404()
• wp-includes/class-wp-theme.php: WP_Theme::__construct()
• wp-includes/class-wp.php: WP::parse_request()
• wp-includes/class-wp.php: WP::send_headers()
• wp-includes/class-wp.php: WP::build_query_string()
• wp-includes/class-wp-query.php: WP_Query::get_posts()
• wp-includes/class-wp-query.php: WP_Query::parse_search()
• wp-includes/class-wp-query.php: WP_Query::get_search_stopwords()
• wp-includes/query.php: wp_old_slug_redirect()
• wp-includes/category.php: get_tags()
• wp-includes/class-wp-image-editor-imagick.php: WP_Image_Editor_Imagick::_save()
• wp-includes/category.php: get_categories()
• wp-includes/load.php: wp_maintenance()
• wp-includes/load.php: wp_debug_mode()
• wp-includes/class-wp-http-cookie.php: WP_Http_Cookie::getHeaderValue()
• wp-includes/class-wp-http-encoding.php: WP_Http_Encoding::accept_encoding()
• wp-includes/class-wp-http-curl.php: WP_Http_Curl::test()
• wp-includes/class-wp-http-proxy.php: WP_HTTP_Proxy::send_through_proxy()
• wp-includes/class-http.php: WP_Http::block_request()
• wp-includes/class-wp-http-streams.php: WP_Http_Streams::request()
• wp-includes/class-wp-http-streams.php: WP_Http_Streams::test()
• wp-includes/class-wp-http-curl.php: WP_Http_Curl::request()
• wp-includes/class-http.php: WP_Http::_get_first_available_transport()
• wp-includes/class-http.php: WP_Http::_dispatch_request()
• wp-includes/class-http.php: WP_Http::request()
• wp-includes/functions.php: wp_allowed_protocols()
• wp-includes/functions.php: wp_checkdate()
• wp-includes/functions.php: wp_auth_check_load()
• wp-includes/functions.php: wp_auth_check_html()
• wp-includes/functions.php: global_terms_enabled()
• wp-includes/functions.php: get_file_data()
• wp-includes/functions.php: _deprecated_function()
• wp-includes/functions.php: _deprecated_file()
• wp-includes/functions.php: _deprecated_argument()
• wp-includes/functions.php: _doing_it_wrong()
• wp-includes/functions.php: iis7_supports_permalinks()
• wp-includes/functions.php: smilies_init()
• wp-includes/functions.php: wp_maybe_load_widgets()
• wp-includes/functions.php: wp_upload_bits()
• wp-includes/functions.php: wp_check_filetype_and_ext()
• wp-includes/functions.php: wp_get_mime_types()
• wp-includes/functions.php: get_allowed_mime_types()
• wp-includes/functions.php: wp_die()
• wp-includes/functions.php: do_robots()
• wp-includes/functions.php: wp_upload_dir()
• wp-includes/functions.php: wp_unique_filename()
• wp-includes/functions.php: status_header()
• wp-includes/functions.php: wp_get_nocache_headers()
• wp-includes/functions.php: date_i18n()
• wp-includes/functions.php: number_format_i18n()
• wp-includes/functions.php: do_enclose()
• wp-includes/widgets/class-wp-nav-menu-widget.php: WP_Nav_Menu_Widget::widget()
• wp-includes/widgets/class-wp-widget-rss.php: WP_Widget_RSS::widget()
• wp-includes/widgets/class-wp-widget-tag-cloud.php: WP_Widget_Tag_Cloud::widget()
• wp-includes/widgets/class-wp-widget-recent-posts.php: WP_Widget_Recent_Posts::widget()
• wp-includes/widgets/class-wp-widget-recent-comments.php: WP_Widget_Recent_Comments::recent_comments_style()
• wp-includes/widgets/class-wp-widget-recent-comments.php: WP_Widget_Recent_Comments::widget()
• wp-includes/widgets/class-wp-widget-calendar.php: WP_Widget_Calendar::widget()
• wp-includes/widgets/class-wp-widget-text.php: WP_Widget_Text::widget()
• wp-includes/widgets/class-wp-widget-categories.php: WP_Widget_Categories::widget()
• wp-includes/widgets/class-wp-widget-search.php: WP_Widget_Search::widget()
• wp-includes/widgets/class-wp-widget-archives.php: WP_Widget_Archives::widget()
• wp-includes/widgets/class-wp-widget-meta.php: WP_Widget_Meta::widget()
• wp-includes/widgets/class-wp-widget-pages.php: WP_Widget_Pages::widget()
• wp-includes/widgets/class-wp-widget-links.php: WP_Widget_Links::widget()
• wp-includes/class-wp-embed.php: WP_Embed::cache_oembed()
• wp-includes/class-wp-embed.php: WP_Embed::maybe_make_link()
• wp-includes/class-wp-embed.php: WP_Embed::shortcode()
• wp-includes/class-wp-feed-cache-transient.php: WP_Feed_Cache_Transient::__construct()
• wp-includes/taxonomy.php: get_term_link()
• wp-includes/taxonomy.php: get_ancestors()
• wp-includes/taxonomy.php: wp_unique_term_slug()
• wp-includes/taxonomy.php: wp_update_term()
• wp-includes/taxonomy.php: wp_get_object_terms()
• wp-includes/taxonomy.php: wp_insert_term()
• wp-includes/taxonomy.php: get_terms()
• wp-includes/taxonomy.php: sanitize_term_field()
• wp-includes/taxonomy.php: create_initial_taxonomies()
• wp-includes/taxonomy.php: get_taxonomy_labels()
• wp-includes/taxonomy.php: get_term()
• wp-includes/link-template.php: set_url_scheme()
• wp-includes/link-template.php: get_dashboard_url()
• wp-includes/link-template.php: get_edit_profile_url()
• wp-includes/link-template.php: wp_get_shortlink()
• wp-includes/link-template.php: the_shortlink()
• wp-includes/link-template.php: get_admin_url()
• wp-includes/link-template.php: includes_url()
• wp-includes/link-template.php: content_url()
• wp-includes/link-template.php: plugins_url()
• wp-includes/link-template.php: network_site_url()
• wp-includes/link-template.php: network_home_url()
• wp-includes/link-template.php: network_admin_url()
• wp-includes/link-template.php: user_admin_url()
• wp-includes/link-template.php: get_comments_pagenum_link()
• wp-includes/link-template.php: get_next_comments_link()
• wp-includes/link-template.php: get_previous_comments_link()
• wp-includes/link-template.php: get_shortcut_link()
• wp-includes/link-template.php: get_home_url()
• wp-includes/link-template.php: get_site_url()
• wp-includes/link-template.php: get_adjacent_post_link()
• wp-includes/link-template.php: get_pagenum_link()
• wp-includes/link-template.php: get_next_posts_link()
• wp-includes/link-template.php: get_previous_posts_link()
• wp-includes/link-template.php: get_edit_user_link()
• wp-includes/link-template.php: get_adjacent_post()
• wp-includes/link-template.php: get_adjacent_post_rel_link()
• wp-includes/link-template.php: get_search_comments_feed_link()
• wp-includes/link-template.php: get_post_type_archive_link()
• wp-includes/link-template.php: get_post_type_archive_feed_link()
• wp-includes/link-template.php: get_edit_post_link()
• wp-includes/link-template.php: edit_post_link()
• wp-includes/link-template.php: get_delete_post_link()
• wp-includes/link-template.php: get_edit_comment_link()
• wp-includes/link-template.php: edit_comment_link()
• wp-includes/link-template.php: get_edit_bookmark_link()
• wp-includes/link-template.php: edit_bookmark_link()
• wp-includes/link-template.php: get_term_feed_link()
• wp-includes/link-template.php: get_edit_tag_link()
• wp-includes/link-template.php: edit_tag_link()
• wp-includes/link-template.php: get_edit_term_link()
• wp-includes/link-template.php: edit_term_link()
• wp-includes/link-template.php: get_search_link()
• wp-includes/link-template.php: get_search_feed_link()
• wp-includes/link-template.php: get_month_link()
• wp-includes/link-template.php: get_day_link()
• wp-includes/link-template.php: the_feed_link()
• wp-includes/link-template.php: get_feed_link()
• wp-includes/link-template.php: get_post_comments_feed_link()
• wp-includes/link-template.php: post_comments_feed_link()
• wp-includes/link-template.php: get_author_feed_link()
• wp-includes/link-template.php: get_permalink()
• wp-includes/link-template.php: get_post_permalink()
• wp-includes/link-template.php: get_page_link()
• wp-includes/link-template.php: _get_page_link()
• wp-includes/link-template.php: get_attachment_link()
• wp-includes/link-template.php: get_year_link()
• wp-includes/link-template.php: the_permalink()
• wp-includes/link-template.php: user_trailingslashit()
• wp-includes/http.php: is_allowed_http_origin()
• wp-includes/http.php: wp_http_validate_url()
• wp-includes/update.php: wp_version_check()
• wp-includes/update.php: wp_update_plugins()
• wp-includes/update.php: wp_update_themes()
• wp-includes/update.php: wp_get_update_data()
• wp-includes/http.php: get_http_origin()
• wp-includes/http.php: get_allowed_http_origins()
• wp-includes/shortcodes.php: do_shortcode_tag()
• wp-includes/shortcodes.php: shortcode_atts()
• wp-includes/shortcodes.php: strip_shortcodes()
• wp-includes/date.php: WP_Date_Query::validate_column()
• wp-includes/date.php: WP_Date_Query::get_sql()
• wp-includes/class-wp-image-editor.php: WP_Image_Editor::set_quality()
• wp-includes/class-wp-image-editor.php: WP_Image_Editor::get_output_format()
• wp-includes/class-oembed.php: WP_oEmbed::__construct()
• wp-includes/class-oembed.php: WP_oEmbed::get_html()
• wp-includes/class-oembed.php: WP_oEmbed::discover()
• wp-includes/class-oembed.php: WP_oEmbed::fetch()
• wp-includes/class-oembed.php: WP_oEmbed::_fetch_with_format()
• wp-includes/class-oembed.php: WP_oEmbed::data2html()
• wp-includes/admin-bar.php: is_admin_bar_showing()
• wp-includes/admin-bar.php: _wp_admin_bar_init()
• wp-includes/feed.php: get_the_category_rss()
• wp-includes/feed.php: rss_enclosure()
• wp-includes/feed.php: atom_enclosure()
• wp-includes/feed.php: self_link()
• wp-includes/feed.php: feed_content_type()
• wp-includes/feed.php: fetch_feed()
• wp-includes/feed.php: get_the_content_feed()
• wp-includes/feed.php: the_excerpt_rss()
• wp-includes/feed.php: the_permalink_rss()
• wp-includes/feed.php: comments_link_feed()
• wp-includes/feed.php: comment_link()
• wp-includes/feed.php: get_comment_author_rss()
• wp-includes/feed.php: comment_text_rss()
• wp-includes/feed.php: get_bloginfo_rss()
• wp-includes/feed.php: bloginfo_rss()
• wp-includes/feed.php: get_default_feed()
• wp-includes/feed.php: get_wp_title_rss()
• wp-includes/feed.php: wp_title_rss()
• wp-includes/feed.php: get_the_title_rss()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::value()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::js_value()
• wp-includes/option.php: set_site_transient()
• wp-includes/class-wp-customize-setting.php: WP_Customize_Setting::sanitize()
• wp-includes/option.php: get_site_transient()
• wp-includes/option.php: get_transient()
• wp-includes/option.php: set_transient()
• wp-includes/option.php: update_option()
• wp-includes/option.php: add_option()
• wp-includes/option.php: get_option()
• wp-includes/class-wp-user-query.php: WP_User_Query::prepare_query()
• wp-includes/class-wp-user-query.php: WP_User_Query::query()
• wp-includes/user.php: wp_update_user()
• wp-includes/user.php: wp_get_user_contact_methods()
• wp-includes/user.php: check_password_reset_key()
• wp-includes/user.php: register_new_user()
• wp-includes/user.php: validate_username()
• wp-includes/user.php: wp_insert_user()
• wp-includes/user.php: get_blogs_of_user()
• wp-includes/user.php: wp_dropdown_users()
• wp-includes/user.php: sanitize_user_field()
• wp-includes/user.php: wp_authenticate_spam_check()
• wp-includes/user.php: count_user_posts()
• wp-includes/user.php: get_user_option()
• wp-includes/user.php: wp_signon()
• wp-includes/user.php: wp_authenticate_username_password()
• wp-includes/bookmark-template.php: wp_list_bookmarks()
• wp-includes/template.php: get_query_template()
• wp-includes/class-wp-image-editor-gd.php: WP_Image_Editor_GD::_save()
• wp-includes/class-walker-nav-menu.php: Walker_Nav_Menu::start_el()
• wp-includes/post-thumbnail-template.php: get_the_post_thumbnail()
• wp-includes/class-walker-page-dropdown.php: Walker_PageDropdown::start_el()
• wp-includes/nav-menu-template.php: wp_nav_menu()
• wp-includes/class-walker-nav-menu.php: Walker_Nav_Menu::start_lvl()
• wp-includes/post-template.php: wp_get_attachment_link()
• wp-includes/post-template.php: prepend_attachment()
• wp-includes/post-template.php: get_the_password_form()
• wp-includes/post-template.php: wp_post_revision_title_expanded()
• wp-includes/class-walker-page.php: Walker_Page::start_el()
• wp-includes/post-template.php: post_password_required()
• wp-includes/post-template.php: wp_link_pages()
• wp-includes/post-template.php: wp_dropdown_pages()
• wp-includes/post-template.php: wp_list_pages()
• wp-includes/post-template.php: wp_page_menu()
• wp-includes/post-template.php: get_the_guid()
• wp-includes/post-template.php: the_content()
• wp-includes/post-template.php: get_the_content()
• wp-includes/post-template.php: the_excerpt()
• wp-includes/post-template.php: get_the_excerpt()
• wp-includes/post-template.php: get_post_class()
• wp-includes/post-template.php: get_body_class()
• wp-includes/media.php: get_media_embedded_in_content()
• wp-includes/media.php: get_post_galleries()
• wp-includes/media.php: get_post_gallery()
• wp-includes/post-template.php: get_the_title()
• wp-includes/post-template.php: the_guid()
• wp-includes/media.php: wp_max_upload_size()
• wp-includes/media.php: wp_plupload_default_settings()
• wp-includes/media.php: wp_prepare_attachment_for_js()
• wp-includes/media.php: wp_enqueue_media()
• wp-includes/media.php: get_attached_media()
• wp-includes/embed.php: wp_embed_defaults()
• wp-includes/embed.php: wp_maybe_load_embeds()
• wp-includes/embed.php: wp_embed_handler_audio()
• wp-includes/embed.php: wp_embed_handler_video()
• wp-includes/media.php: wp_get_video_extensions()
• wp-includes/media.php: wp_video_shortcode()
• wp-includes/media.php: adjacent_image_link()
• wp-includes/media.php: gallery_shortcode()
• wp-includes/media.php: wp_playlist_shortcode()
• wp-includes/media.php: wp_mediaelement_fallback()
• wp-includes/media.php: wp_get_audio_extensions()
• wp-includes/media.php: wp_get_attachment_id3_keys()
• wp-includes/media.php: wp_audio_shortcode()
• wp-includes/media.php: get_image_tag()
• wp-includes/media.php: wp_constrain_dimensions()
• wp-includes/media.php: image_resize_dimensions()
• wp-includes/media.php: image_get_intermediate_size()
• wp-includes/media.php: get_intermediate_image_sizes()
• wp-includes/media.php: wp_get_attachment_image_src()
• wp-includes/media.php: wp_get_attachment_image()
• wp-includes/media.php: img_caption_shortcode()
• wp-includes/media.php: image_constrain_size_for_editor()
• wp-includes/media.php: image_downsize()
• wp-includes/post.php: wp_mime_type_icon()
• wp-includes/post.php: get_posts_by_author_sql()
• wp-includes/post.php: get_lastpostdate()
• wp-includes/post.php: get_lastpostmodified()
• wp-includes/post.php: wp_delete_attachment()
• wp-includes/post.php: wp_get_attachment_metadata()
• wp-includes/post.php: wp_update_attachment_metadata()
• wp-includes/post.php: wp_get_attachment_url()
• wp-includes/post.php: wp_get_attachment_thumb_file()
• wp-includes/post.php: wp_get_attachment_thumb_url()
• wp-includes/post.php: get_enclosed()
• wp-includes/post.php: get_pung()
• wp-includes/post.php: get_to_ping()
• wp-includes/post.php: get_page_uri()
• wp-includes/post.php: get_pages()
• wp-includes/post.php: wp_unique_post_slug()
• wp-includes/post.php: add_ping()
• wp-includes/post.php: wp_insert_post()
• wp-includes/post.php: get_post_mime_types()
• wp-includes/post.php: wp_delete_post()
• wp-includes/post.php: sanitize_post_field()
• wp-includes/post.php: wp_count_posts()
• wp-includes/post.php: wp_count_attachments()
• wp-includes/post.php: get_post_type_labels()
• wp-includes/post.php: get_post_status()
• wp-includes/post.php: get_attached_file()
• wp-includes/post.php: update_attached_file()
• wp-includes/post.php: _wp_relative_upload_path()
• wp-includes/class-wp-rewrite.php: WP_Rewrite::mod_rewrite_rules()
• wp-includes/class-wp-rewrite.php: WP_Rewrite::iis7_url_rewrite_rules()
• wp-includes/class-wp-rewrite.php: WP_Rewrite::flush_rules()
• wp-includes/class-wp-rewrite.php: WP_Rewrite::rewrite_rules()
• wp-includes/rewrite.php: url_to_postid()
• wp-includes/canonical.php: redirect_canonical()
• wp-includes/revision.php: wp_revisions_to_keep()
• wp-includes/ms-functions.php: get_space_used()
• wp-includes/ms-functions.php: get_space_allowed()
• wp-includes/ms-functions.php: wp_is_large_network()
• wp-includes/revision.php: _wp_post_revision_fields()
• wp-includes/revision.php: wp_save_post_revision()
• wp-includes/ms-functions.php: wp_maybe_update_network_site_counts()
• wp-includes/ms-functions.php: wp_maybe_update_network_user_counts()
• wp-includes/ms-functions.php: wpmu_welcome_user_notification()
• wp-includes/ms-functions.php: maybe_redirect_404()
• wp-includes/ms-functions.php: newblog_notify_siteadmin()
• wp-includes/ms-functions.php: newuser_notify_siteadmin()
• wp-includes/ms-functions.php: domain_exists()
• wp-includes/ms-functions.php: wpmu_welcome_notification()
• wp-includes/ms-functions.php: is_email_address_unsafe()
• wp-includes/ms-functions.php: wpmu_validate_user_signup()
• wp-includes/ms-functions.php: wpmu_validate_blog_signup()
• wp-includes/ms-functions.php: wpmu_signup_blog()
• wp-includes/ms-functions.php: wpmu_signup_user()
• wp-includes/ms-functions.php: wpmu_signup_blog_notification()
• wp-includes/ms-functions.php: wpmu_signup_user_notification()
• wp-includes/bookmark.php: sanitize_bookmark_field()
• wp-includes/ms-load.php: get_site_by_path()
• wp-includes/class-wp-http-ixr-client.php: WP_HTTP_IXR_Client::query()
• wp-includes/bookmark.php: get_bookmarks()
• wp-includes/ms-deprecated.php: graceful_fail()
• wp-includes/ms-load.php: ms_site_check()
• wp-includes/class.wp-scripts.php: WP_Scripts::do_item()
• wp-includes/class.wp-scripts.php: WP_Scripts::all_deps()
• wp-includes/author-template.php: get_the_author_meta()
• wp-includes/author-template.php: the_author_meta()
• wp-includes/author-template.php: get_author_posts_url()
• wp-includes/author-template.php: is_multi_author()
• wp-includes/author-template.php: get_the_author()
• wp-includes/author-template.php: get_the_modified_author()
• wp-includes/ms-blogs.php: get_blog_option()
• wp-includes/nav-menu.php: wp_setup_nav_menu_item()
• wp-includes/nav-menu.php: has_nav_menu()
• wp-includes/nav-menu.php: wp_get_nav_menus()
• wp-includes/nav-menu.php: wp_get_nav_menu_items()
• wp-includes/nav-menu.php: wp_get_nav_menu_object()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mt_supportedTextFilters()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::pingback_ping()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::pingback_error()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::mw_newMediaObject()
• 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_newComment()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPosts()
• 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::_prepare_page()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_comment()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_user()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_insert_post()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getPost()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_taxonomy()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_term()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_post()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_post_type()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::_prepare_media_item()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::__construct()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::login()
• wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::initialise_blog_option_info()
• wp-includes/wp-db.php: wpdb::query()
• wp-includes/wp-db.php: wpdb::set_sql_mode()
• wp-includes/class-wp-widget.php: WP_Widget::display_callback()
• wp-includes/class-wp-widget.php: WP_Widget::update_callback()
• wp-includes/class-wp-widget.php: WP_Widget::form_callback()
• wp-includes/widgets.php: dynamic_sidebar()
• wp-includes/widgets.php: is_active_sidebar()
• wp-includes/widgets.php: wp_get_sidebars_widgets()
• wp-includes/comment-template.php: get_post_reply_link()
• wp-includes/comment-template.php: get_cancel_comment_reply_link()
• wp-includes/comment-template.php: get_comment_id_fields()
• wp-includes/comment-template.php: wp_list_comments()
• wp-includes/comment-template.php: comment_form()
• wp-includes/comment-template.php: get_trackback_url()
• wp-includes/comment-template.php: comments_open()
• wp-includes/comment-template.php: pings_open()
• wp-includes/comment-template.php: comments_template()
• wp-includes/comment-template.php: comments_popup_link()
• wp-includes/comment-template.php: get_comment_reply_link()
• wp-includes/comment-template.php: get_comment_link()
• wp-includes/comment-template.php: get_comments_link()
• wp-includes/comment-template.php: get_comments_number()
• wp-includes/comment-template.php: get_comment_text()
• wp-includes/comment-template.php: comment_text()
• wp-includes/comment-template.php: get_comment_time()
• wp-includes/comment-template.php: get_comment_type()
• wp-includes/comment-template.php: comment_author_url()
• wp-includes/comment-template.php: get_comment_author_url_link()
• wp-includes/comment-template.php: get_comment_class()
• wp-includes/comment-template.php: get_comment_date()
• wp-includes/comment-template.php: get_comment_excerpt()
• wp-includes/comment-template.php: comment_excerpt()
• wp-includes/comment-template.php: get_comment_ID()
• wp-includes/comment-template.php: get_comment_author()
• wp-includes/comment-template.php: comment_author()
• wp-includes/comment-template.php: get_comment_author_email()
• wp-includes/comment-template.php: comment_author_email()
• wp-includes/comment-template.php: get_comment_author_email_link()
• wp-includes/comment-template.php: get_comment_author_link()
• wp-includes/comment-template.php: get_comment_author_IP()
• wp-includes/comment-template.php: get_comment_author_url()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::capture_filter_pre_get_option()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::get_setting_args()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::customize_register()
• wp-includes/class-wp-customize-widgets.php: WP_Customize_Widgets::is_wide_widget()
• wp-includes/script-loader.php: print_head_scripts()
• wp-includes/script-loader.php: print_footer_scripts()
• wp-includes/script-loader.php: print_admin_styles()
• wp-includes/script-loader.php: print_late_styles()
• wp-includes/comment.php: _close_comments_for_old_posts()
• wp-includes/comment.php: _close_comments_for_old_post()
• wp-includes/script-loader.php: wp_default_scripts()
• wp-includes/comment.php: wp_new_comment()
• wp-includes/comment.php: wp_update_comment()
• wp-includes/comment.php: wp_update_comment_count_now()
• wp-includes/comment.php: do_trackbacks()
• wp-includes/comment.php: pingback()
• wp-includes/comment.php: wp_get_current_commenter()
• wp-includes/comment.php: wp_filter_comment()
• wp-includes/comment.php: get_page_of_comment()
• wp-includes/comment.php: wp_count_comments()
• wp-includes/comment.php: wp_set_comment_cookies()
• wp-includes/comment.php: sanitize_comment_cookies()
• wp-includes/comment.php: wp_allow_comment()
• wp-includes/meta.php: is_protected_meta()
• wp-includes/meta.php: sanitize_meta()
• wp-includes/meta.php: register_meta()
• wp-includes/comment.php: check_comment()
• wp-includes/comment.php: get_comment()
• wp-includes/meta.php: delete_metadata()
• wp-includes/meta.php: get_metadata()
• wp-includes/meta.php: metadata_exists()
• wp-includes/class-wp-editor.php: _WP_Editors::wp_link_query()
• wp-includes/meta.php: add_metadata()
• wp-includes/meta.php: update_metadata()
• wp-includes/class-wp-editor.php: _WP_Editors::editor_settings()
• wp-includes/class-wp-editor.php: _WP_Editors::wp_mce_translation()
• wp-includes/media-template.php: wp_print_media_templates()
• wp-includes/class-wp-editor.php: _WP_Editors::parse_settings()
• 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: 8You must log in to vote on the helpfulness of this note Contributed by Codex

   Echo after Filtering

   
   echo apply_filters( $tag, $value );
   

   Get Filtered

   
   $myvar = apply_filters( $tag, $value );
   

   Additional Filter Arguments

   
   $myvar = apply_filters( $tag, $value, $param, $otherparam );
   

   For example:

   
   $myvar = apply_filters( 'example_filter', 'filter me', 'arg1', 'arg2 ');
   

   With the_title filter

   
   $my_custom_title = apply_filters('the_title', '  My Custom Title (tm)  ');
   $my_custom_title will now contain 'My Custom Title ™', since the_title filter applies wptexturize() and trim(), among others.
   

One fundamental argument that is easy to miss is specifying the number of arguments. Most filters have only one argument and so people drop the argument from add_filter.

The 3, below is very important.

add_filter( 'example_filter', 'example_callback', 10, 3 );

Otherwise you get the following error, such as this StackOverflow question(http://stackoverflow.com/questions/24198086/missing-argument-2-for-the-function-in-wordpress):

Missing argument 2 for example_callback()

Uh huh.

apply_filters ( string $tag, mixed $value );

function apply_filters( $tag, $value )

Parameters:
$tag — (string) (Required) The name of the filter hook.
$value — (mixed) (Required) The value on which the filters hooked to $tag are applied on.
$var — (mixed) (Required) Additional variables passed to the functions hooked to $tag.

Right. Tip: this does not make sense, in case you missed it.