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__checked_selected_helper() – Private helper function for checked, selected, disabled and readonly.

__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