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__clear_multi_author_cache() – Helper function to clear the cache for number of authors.

_admin_menu – action

_clear_modified_cache_on_transition_comment_status() – Clear the lastcommentmodified cached value when a comment status is changed.

_customizer_mobile_viewport_meta() – Adds viewport meta for mobile in Customizer.

_delete_attachment_theme_mod() – Checks an attachment being deleted to see if it’s a header or background image.

_get_meta_table() – Retrieve the name of the metadata table for the specified object type.

_get_plugin_data_markup_translate() – Sanitizes plugin data, optionally adds markup, optionally translates.

_ipad_meta() –

_is_valid_nav_menu_item() – Return if a menu item is valid.

_list_meta_row() – Outputs a single row of public meta data in the Custom Fields meta box.

_make_cat_compat() – Update category structure to old pre 2.3 from new taxonomy structure.

_make_email_clickable_cb() – Callback to convert email address match to HTML A element.

_make_url_clickable_cb() – Callback to convert URI match to HTML A element.

_make_web_ftp_clickable_cb() – Callback to convert URL match to HTML A element.

_maybe_update_core() – Determines whether core should be updated.

_maybe_update_plugins() – Check the last time plugins were run before checking plugin versions.

_maybe_update_themes() – Check themes versions only after a duration of time.

_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_button() – This was once used to display a media button.

_media_states() – Outputs the attachment media states as HTML.

_nav_menu_item_id_use_once() – Prevents a menu item ID from being used more than once.

_navigation_markup() – Wraps passed links in navigational markup.

_network_admin_menu – action

_post_type_meta_capabilities() – Store or return a list of post type meta caps for map_meta_cap().

_sort_nav_menu_items() – Sort menu items by the desired key.

_user_admin_menu – action

_usort_by_first_member() – Sorts a multidimensional array by first member of each top level member

_wp_ajax_menu_quick_search() – Prints the appropriate response to a menu quick search.

_wp_delete_post_menu_item() – Callback for handling a menu item when its original object is deleted.

_wp_delete_tax_menu_item() – Serves as a callback for handling a menu item when its original object is deleted.

_WP_Editors::get_mce_locale() – Returns the TinyMCE locale.

_WP_Editors::wp_mce_translation() – Translates the default TinyMCE strings and returns them as JSON encoded object ready to be loaded with tinymce.addI18n(), or as JS snippet that should run after tinymce.js is loaded.

_wp_expand_nav_menu_post_data() – If a JSON blob of navigation menu data is in POST data, expand it and inject it into `$_POST` to avoid PHP `max_input_vars` limitations. See #14134.

_wp_image_meta_replace_original() – Updates the attached file and image meta data when the original image was edited.

_wp_make_subsizes() – Low-level function to create image sub-sizes.

_wp_menu_item_classes_by_context() – Adds the class property classes for the current context, if applicable.

_wp_menu_output() – Display menu.

_wp_menus_changed() – Handle menu config after theme change.

_wp_mysql_week() – Return a MySQL expression for selecting the week number based on the start_of_week option.

_wp_nav_menu_meta_box_object() – Adds custom arguments to some of the meta box object types.

_wp_register_meta_args_allowed_list() – Filters out `register_meta()` args based on an allowed list.

_wp_register_meta_args_whitelist() – Filters out `register_meta()` args based on an allowed list.

_wp_scripts_maybe_doing_it_wrong() – Helper function to output a _doing_it_wrong message when applicable.

$context_memory_limit – filter

add_$meta_type_meta – action

add_$meta_type_metadata – filter

add_admin_bar_menus – action

add_blog_metadata – filter

add_comment_meta() – Add meta data field to a comment.

add_magic_quotes() – Walks the array while sanitizing the contents.

add_management_page() – Add submenu page to the Tools main menu.

add_media_page() – Add submenu page to the Media main menu.

add_menu_classes – filter

add_menu_classes() –

add_menu_page() – Add a top-level menu page.

add_meta_box() – Adds a meta box to one or more screens.

add_meta_boxes – action

add_meta_boxes_$post_type – action

add_meta_boxes_$this – action

add_meta_boxes_comment – action

add_meta_boxes_link – action

add_meta() – Add post meta data defined in $_POST superglobal for post with given ID.

add_metadata() – Adds metadata for the specified object.

add_post_meta() – Adds a meta field to the given post.

add_signup_meta – filter

add_site_meta() – Adds metadata to a site.

add_term_meta() – Adds metadata to a term.

add_term_metadata – filter

add_user_meta() – Adds meta data to a user.

added_$meta_type_meta – action

added_blog_meta – action

added_comment_meta – action

added_post_meta – action

added_term_meta – action

admin_bar_menu – action

admin_head-media-upload-popup – action

admin_head-nav-menus.php – action

admin_memory_limit – filter

admin_menu – action

admin_print_scripts-media-upload-popup – action

admin_print_styles-media-upload-popup – action

admin_viewport_meta – filter

after_menu_locations_table – action

after_mu_upgrade – action

after_wp_tiny_mce – action

allow_major_auto_core_updates – filter

allow_minor_auto_core_updates – filter

apache_mod_loaded() – Does the specified module exist in the Apache config?

AtomParser::map_attrs() – Map attributes to key="val"

AtomParser::map_xmlns() – Map XML namespace to string.

attachment_id3_data_meta_box() – Display fields for ID3 data

attachment_max_dims – filter

attachment_submit_meta_box() – Display attachment submit form fields.

attachment_submitbox_metadata() – Displays non-editable attachment metadata in the publish meta box.

attachment_submitbox_misc_actions – action

audio_submitbox_misc_sections – filter

auth_$object_type_meta_$meta_key – filter

auth_$object_type_meta_$meta_key_for_$object_subtype – filter

auth_cookie_malformed – action

before_wp_tiny_mce – action