__return_empty_string() – Returns an empty string.
_access_denied_splash() – Displays an access denied message when a user tries to view a site’s dashboard they do not have access to.
_add_post_type_submenus() – Add submenus for post types.
_admin_search_query() – Displays the search query.
_config_wp_siteurl() – Retrieve the WordPress site URL.
_core_updated_successfully – action
_custom_logo_header_styles() – Adds CSS to hide header text for custom logo, based on Customizer setting.
_delete_option_fresh_site() – Delete the fresh site option.
_get_wptexturize_shortcode_regex() – Retrieve the regular expression for shortcodes.
_get_wptexturize_split_regex() – Retrieve the combined regular expression for HTML and shortcodes.
_local_storage_notice() – Output the HTML for restoring the post data from DOM storage
_mb_strlen() – Internal compat function to mimic mb_strlen().
_mb_substr() – Internal compat function to mimic mb_substr().
_mce_set_direction() – Set the localized direction for MCE plugin.
_media_states() –
_oembed_rest_pre_serve_request() – Hooks into the REST API output to print XML instead of JSON.
_post_states() –
_preview_theme_stylesheet_filter() – Private function to modify the current stylesheet when previewing a theme
_prime_site_caches() – Adds any sites from the given ids to the cache that do not already exist in cache.
_print_emoji_detection_script() – Prints inline Emoji dection script
_print_scripts() – Print scripts (internal use only)
_print_styles() – Print styles (internal use only)
_remove_theme_support() – Do not use. Removes theme support internally, ignorant of the blacklist.
_reset_front_page_settings_for_post() – Reset the page_on_front, show_on_front, and page_for_post settings when a linked page is deleted or trashed.
_sanitize_text_fields() – Internal helper function to sanitize a string from user input or from the db
_save_post_hook() – Callback formerly fired on the save_post hook. No longer needed.
_scalar_wp_die_handler() – Kill WordPress execution.
_search_terms_tidy() – Formerly used internally to tidy up the search terms.
_set_cron_array() – Updates the CRON option with the new CRON array.
_set_preview() – Sets up the post object for preview based on the post autosave.
_show_post_preview() – Filters the latest content for preview from the post autosave.
_sort_name_callback() – Callback to sort array by a ‘name’ key.
_sort_nav_menu_items() – Sort menu items by the desired key.
_sort_uname_callback() – Callback to sort array by a ‘Name’ key.
_split_shared_term() – Create a new term for a term_taxonomy item that currently shares its term with another term_taxonomy.
_split_str_by_whitespace() – Breaks a string into chunks by splitting at whitespace characters.
_thickbox_path_admin_subfolder() – Thickbox image paths for Network Admin.
_transition_post_status() – Hook for managing future post transitions to published.
_truncate_post_slug() – Truncate a post slug.
_wp_batch_split_terms() – Splits a batch of shared taxonomy terms.
_wp_check_for_scheduled_split_terms() – In order to avoid the _wp_batch_split_terms() job being accidentally removed, check that it’s still scheduled while we haven’t finished splitting terms.
_wp_check_split_default_terms() – Check default categories when a term gets split to see if any of them need to be updated.
_wp_check_split_nav_menu_terms() – If the term being split is a nav_menu, change associations.
_wp_check_split_terms_in_menus() – Check menu items when a term gets split to see if any of them need to be updated.
_wp_customize_loader_settings() – Adds settings for the customize-loader script.
_WP_Dependency::set_translations() – Sets the translation domain for this dependency.
_WP_Editors::default_settings() – Returns the default TinyMCE settings.
_WP_Editors::editor_settings() –
_WP_Editors::enqueue_scripts() –
_WP_Editors::parse_settings() – Parse default arguments for the editor instance.
_wp_footer_scripts() – Private, for use in *_footer_scripts hooks
_wp_get_image_size_from_meta() – Get the image size as array from its meta data.
_wp_json_convert_string() – Convert a string to UTF-8, so that it can be safely encoded to JSON.
_wp_json_sanity_check() – Perform sanity checks on data that shall be encoded to JSON.
_wp_kses_split_callback() – Callback for wp_kses_split.
_wp_object_count_sort_cb() – Serves as a callback for comparing objects based on count.
_wp_object_name_sort_cb() – Serves as a callback for comparing objects based on name.
_wp_privacy_requests_screen_options() – Add options for the privacy requests screens.
_wp_privacy_send_erasure_fulfillment_notification() – Notify the user when their erasure request is fulfilled.
_wp_privacy_send_request_confirmation_notification() – Notify the site administrator via email when a request is confirmed.
_wp_privacy_settings_filter_draft_page_titles() – Appends ‘(Draft)’ to draft page titles in the privacy page dropdown so that unpublished content is obvious.
_wp_privacy_statuses() – Return statuses for privacy requests.
_wp_sanitize_utf8_in_redirect() – URL encode UTF-8 characters in a URL.
_wp_scripts_maybe_doing_it_wrong() – Helper function to output a _doing_it_wrong message when applicable.
_wp_sidebars_changed() – Handle sidebars config after theme change
_wp_specialchars() – Converts a number of special characters into their HTML entities.
$field_no_prefix_save_pre – filter
$new_status_$post – action
$old_status_to_$new_status – action
$type_send_to_editor_url – filter
$type_settingsfilter – filter
$type_upload_iframe_src – filter
activate_sitewide_plugin() – Deprecated functionality for activating a network-only plugin.
add_editor_style() – Add callback for custom TinyMCE editor stylesheets.
add_image_size() – Register a new image size.
add_post_type_support() – Register support of certain features for a post type.
add_screen_option() – Register and configure an admin screen option
add_settings_error() – Register a settings error to be displayed to the user.
add_settings_field() – Add a new field to a section of a settings page.
add_settings_section() – Add a new section to a settings page.
add_shortcode() – Adds a new shortcode.
add_signup_meta – filter
add_site_meta() – Adds metadata to a site.
add_site_option – action
add_site_option_$option – action
add_site_option_new_admin_email – action
add_site_option() – Add a new option for the current network.
add_submenu_page() – Add a submenu page.
add_theme_support() – Registers theme support for a given feature.
admin_color_scheme_picker – action
admin_color_scheme_picker() – Display the default admin color scheme picker (Used in user-edit.php)
admin_enqueue_scripts – action
admin_footer-$hook_suffix – action
admin_head-$hook_suffix – action
admin_post_thumbnail_size – filter
admin_print_footer_scripts – action
admin_print_footer_scripts-$hook_suffix – action
admin_print_footer_scripts-press-this.php – action
admin_print_footer_scripts-widgets.php – action
admin_print_scripts – action
admin_print_scripts-$hook_suffix – action
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