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_ajax_wp_die_handler() – Kills WordPress execution and displays Ajax response with an error message.

_config_wp_home() – Retrieve the WordPress home page URL.

_config_wp_siteurl() – Retrieve the WordPress site URL.

_default_wp_die_handler() – Kills WordPress execution and displays HTML page with an error message.

_doing_it_wrong() – Mark something as being incorrectly called.

_get_widget_id_base() – Retrieves the widget ID base value.

_get_wptexturize_shortcode_regex() – Retrieve the regular expression for shortcodes.

_get_wptexturize_split_regex() – Retrieve the combined regular expression for HTML and shortcodes.

_json_wp_die_handler() – Kills WordPress execution and displays JSON response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

_jsonp_wp_die_handler() – Kills WordPress execution and displays JSONP response with an error message.

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

_post_format_wp_get_object_terms() – Remove the post format prefix from the name property of the term objects created by wp_get_object_terms().

_redirect_to_about_wordpress() – Redirect to the About WordPress page after a successful upgrade.

_register_widget_form_callback() – Registers the form callback for a widget.

_register_widget_update_callback() – Registers the update callback for a widget.

_restore_wpautop_hook() – If do_blocks() needs to remove wp_autop() from the `the_content` filter, this re-adds it afterwards, for subsequent `the_content` usage.

_scalar_wp_die_handler() – Kill WordPress execution.

_split_str_by_whitespace() – Breaks a string into chunks by splitting at whitespace characters.

_walk_bookmarks() – The formatted output of a list of bookmarks.

_wp_add_global_attributes() – Helper function to add global attributes to a tag in the allowed html list.

_wp_admin_bar_init() – Instantiate the admin bar object and set it up as a global for access elsewhere.

_wp_admin_html_begin() –

_wp_ajax_add_hierarchical_term() – Ajax handler for adding a hierarchical term.

_wp_ajax_delete_comment_response() – Sends back current comment total and new page links if they need to be updated.

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

_wp_auto_add_pages_to_menu() – Automatically add newly published page objects to menus with that as an option.

_wp_batch_split_terms() – Splits a batch of shared taxonomy terms.

_wp_call_all_hook() – Call the ‘all’ hook, which will process the functions hooked into it.

_wp_can_use_pcre_u() – Returns whether PCRE/u (PCRE_UTF8 modifier) is available for use.

_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_credits_add_profile_link() – Retrieve the link to a contributor’s WordPress.org profile page.

_wp_credits_build_object_link() – Retrieve the link to an external library used in WordPress.

_wp_customize_changeset_filter_insert_post_data() – Filters changeset post data upon insert to ensure post_name is intact.

_wp_customize_include() – Includes and instantiates the WP_Customize_Manager class.

_wp_customize_loader_settings() – Adds settings for the customize-loader script.

_wp_customize_publish_changeset() – Publishes a snapshot’s changes.

_wp_dashboard_control_callback() – Outputs controls for the current dashboard widget.

_wp_dashboard_recent_comments_row() – Outputs a row for the Recent Comments widget.

_wp_delete_customize_changeset_dependent_auto_drafts() – Delete auto-draft posts associated with the supplied changeset.

_wp_delete_orphaned_draft_menu_items() – Deletes orphaned draft menu items

_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_Dependency::__construct() – Setup dependencies.

_WP_Dependency::add_data() – Add handle data.

_WP_Dependency::set_translations() – Sets the translation domain for this dependency.

_wp_die_process_input() – Processes arguments passed to wp_die() consistently for its handlers.

_WP_Editors::__construct() –

_WP_Editors::_parse_init() –

_WP_Editors::default_settings() – Returns the default TinyMCE settings.

_WP_Editors::editor_js() – Print (output) the TinyMCE configuration and initialization scripts.

_WP_Editors::editor_settings() –

_WP_Editors::editor() – Outputs the HTML for a single instance of the editor.

_WP_Editors::enqueue_default_editor() – Enqueue all editor scripts.

_WP_Editors::enqueue_scripts() –

_WP_Editors::force_uncompressed_tinymce() – Force uncompressed TinyMCE when a custom theme has been defined.

_WP_Editors::get_baseurl() –

_WP_Editors::get_mce_locale() – Fires when the editor scripts are loaded for later initialization, after all scripts and settings are printed.

_WP_Editors::get_translation() –

_WP_Editors::parse_settings() – Parse default arguments for the editor instance.

_WP_Editors::print_default_editor_scripts() – Print (output) all editor scripts and default settings.

_WP_Editors::print_tinymce_scripts() – Print (output) the main TinyMCE scripts.

_WP_Editors::wp_fullscreen_html() –

_WP_Editors::wp_link_dialog() – Dialog for internal linking.

_WP_Editors::wp_link_query() – Performs post queries for internal linking.

_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_emoji_list() – Returns arrays of emoji data.

_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_filter_build_unique_id() – Build Unique ID for storage and retrieval.

_wp_filter_taxonomy_base() – Filters the URL base for taxonomies.

_wp_footer_scripts() – Private, for use in *_footer_scripts hooks

_wp_get_allowed_postdata() – Returns only allowed post data fields

_wp_get_attachment_relative_path() – Get the attachment path relative to the upload directory.

_wp_get_current_user() – Retrieves the current user object.

_wp_get_image_size_from_meta() – Get the image size as array from its meta data.

_wp_get_post_revision_version() – Gets the post revision version.

_wp_get_user_contactmethods() – The old private function for setting up user contact methods.

_wp_handle_upload() – Handle PHP uploads in WordPress, sanitizing file names, checking extensions for mime type, and moving the file to the appropriate directory within the uploads directory.

_wp_http_get_object() – Returns the initialized WP_Http Object

_wp_image_editor_choose() – Tests which editors are capable of supporting the request.

_wp_iso_convert() – Helper function to convert hex encoded chars to ASCII

_wp_json_convert_string() – Convert a string to UTF-8, so that it can be safely encoded to JSON.

_wp_json_prepare_data() – Prepares response data to be serialized to JSON.

_wp_json_sanity_check() – Perform sanity checks on data that shall be encoded to JSON.

_wp_keep_alive_customize_changeset_dependent_auto_drafts() – Make sure that auto-draft posts get their post_date bumped or status changed to draft to prevent premature garbage-collection.

_wp_kses_decode_entities_chr_hexdec() – Regex callback for wp_kses_decode_entities()

_wp_kses_decode_entities_chr() – Regex callback for wp_kses_decode_entities()

_wp_kses_split_callback() – Callback for wp_kses_split.

_wp_link_page() – Helper function for wp_link_pages().

_WP_List_Table_Compat::__construct() –

_WP_List_Table_Compat::get_column_info() –

_WP_List_Table_Compat::get_columns() –

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

_wp_menu_output() – Display menu.

_wp_menus_changed() – Handle menu config after theme change.