_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() –
_n_noop() – Registers plural strings in POT file, but does not translate them.
_n() – Translates and retrieves the singular or plural form based on the supplied number.
_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.
_nc() – Legacy version of _n(), which supports contexts.
_nx_noop() – Registers plural strings with gettext context in POT file, but does not translate them.
_nx() – Translates and retrieves the singular or plural form based on the supplied number, with gettext context.
_oembed_create_xml() – Creates an XML string from a given array.
_oembed_filter_feed_content() – Prepare the oembed HTML to be displayed in an RSS feed.
_oembed_rest_pre_serve_request() – Hooks into the REST API output to print XML instead of JSON.
_pad_term_counts() – Add count of children to parent count.
_page_traverse_name() – Traverse and return all the nested children post names of a root page.
_post_format_get_term() – Remove the post format prefix from the name property of the term object created by get_term().
_post_format_get_terms() – Remove the post format prefix from the name property of the term objects created by get_terms().
_post_format_link() – Filters the post format term link to remove the format prefix.
_post_format_request() – Filters the request to allow for the format prefix.
_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().
_post_states() –
_post_type_meta_capabilities() – Store or return a list of post type meta caps for map_meta_cap().
_preview_theme_stylesheet_filter() – Private function to modify the current stylesheet when previewing a theme
_preview_theme_template_filter() – Private function to modify the current template when previewing a theme
_prime_comment_caches() – Adds any comments from the given IDs to the cache that do not already exist in cache.
_prime_network_caches() – Adds any networks from the given IDs to the cache that do not already exist in cache.
_prime_post_caches() – Adds any posts from the given ids to the cache that do not already exist in cache
_prime_site_caches() – Adds any sites from the given ids to the cache that do not already exist in cache.
_prime_term_caches() – Adds any terms 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)
_publish_post_hook() – Hook to schedule pings and enclosures when a post is published.
_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.
_relocate_children() – This was once used to move child posts to a new parent.
_remove_qs_args_if_not_in_url() – Removes arguments from a query string if they are not present in a URL DO NOT use this in plugin code.
_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.
_response_to_rss() – Retrieve
_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.
_rotate_image_resource() – Returns an image resource. Internal use only.
_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.
_unzip_file_pclzip() – Attempts to unzip an archive using the PclZip library.
_unzip_file_ziparchive() – Attempts to unzip an archive using the ZipArchive class.
_update_blog_date_on_post_delete() – Handler for updating the blog date when a published post is deleted.
_update_blog_date_on_post_publish() – Handler for updating the blog date when a post is published or an already published post is changed.
_update_generic_term_count() – Will update term count based on number of objects.
_update_post_term_count() – Will update term count based on object types of the current taxonomy.
_update_posts_count_on_delete() – Handler for updating the current site’s posts count when a post is deleted.
_update_posts_count_on_transition_post_status() – Handler for updating the current site’s posts count when a post status changes.
_update_term_count_on_transition_post_status() – Update the custom taxonomies’ term counts when a post’s status is changed.
_upgrade_422_find_genericons_files_in_folder() – Recursively find Genericons example files in a given folder.
_upgrade_422_remove_genericons() – Cleans up Genericons example files.
_upgrade_440_force_deactivate_incompatible_plugins() –
_upgrade_cron_array() – Upgrade a Cron info array.
_usort_by_first_member() – Sorts a multidimensional array by first member of each top level member
_usort_terms_by_ID() – Sort categories by ID.
_usort_terms_by_name() – Sort categories by name.
_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.
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