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_add_post_type_submenus() – Add submenus for post types.

_admin_notice_post_locked() – Outputs the HTML for the notice to say that someone else is editing or has taken over editing of this post.

_autop_newline_preservation_helper() – Newline preservation help function for wpautop

_count_posts_cache_key() – Return the cache key for wp_count_posts() based on the passed arguments.

_draft_or_post_title() – Get the post title.

_find_post_by_old_date() – Find the post ID for redirecting an old date.

_find_post_by_old_slug() – Find the post ID for redirecting an old slug.

_future_post_hook() – Hook used to schedule publication for a post marked for the future.

_get_admin_bar_pref() – Retrieve the admin bar display preference of a user.

_get_component_from_parsed_url_array() – Retrieve a specific component from a parsed URL array.

_get_last_post_time() – Get the timestamp of the last time any post was modified or published.

_get_page_link – filter

_get_page_link() – Retrieves the page permalink.

_get_path_to_translation_from_lang_dir() – Gets the path to a translation file in the languages directory for the current locale.

_get_path_to_translation() – Gets the path to a translation file for loading a textdomain just in time.

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

_get_plugin_from_callback() – Internal helper function to find the plugin from a meta box callback.

_get_post_ancestors() – Retrieve post ancestors.

_image_get_preview_ratio() – Image preview ratio. Internal use only.

_insert_into_post_button() – This was once used to display an ‘Insert into Post’ button.

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

_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.

_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.

_save_post_hook() – Callback formerly fired on the save_post hook. No longer needed.

_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.

_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.

_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.

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

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

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

_wp_customize_publish_changeset() – Publishes a snapshot’s changes.

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

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

_WP_Editors::_parse_init() –

_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_get_allowed_postdata() – Returns only allowed post data fields

_wp_get_post_revision_version() – Gets the post revision version.

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

_wp_link_page() – Helper function for wp_link_pages().

_wp_personal_data_cleanup_requests() – Cleans up failed and expired requests before displaying the list table.

_wp_personal_data_export_page() – Personal data export.

_wp_personal_data_handle_actions() – Handle list table actions.

_wp_personal_data_removal_page() – Personal data anonymization.

_wp_post_revision_data() – Returns a post array ready to be inserted into the posts table as a post revision.

_wp_post_revision_field_$field – filter

_wp_post_revision_fields – filter

_wp_post_revision_fields() – Determines which fields of posts are to be saved in revisions.

_wp_post_thumbnail_class_filter_add() – Adds ‘_wp_post_thumbnail_class_filter’ callback to the ‘wp_get_attachment_image_attributes’ filter hook. Internal use only.

_wp_post_thumbnail_class_filter_remove() – Removes the ‘_wp_post_thumbnail_class_filter’ callback from the ‘wp_get_attachment_image_attributes’ filter hook. Internal use only.

_wp_post_thumbnail_class_filter() – Adds a ‘wp-post-image’ class to post thumbnails. Internal use only.

_wp_post_thumbnail_html() – Output HTML for the post thumbnail meta-box.

_wp_posts_page_notice() – Output a notice when editing the page for posts (internal use only).

_wp_preview_post_thumbnail_filter() – Filters post thumbnail lookup to set the post thumbnail.

_wp_preview_terms_filter() – Filters terms lookup to set the post format.

_wp_privacy_account_request_confirmed_message() – Return request confirmation message HTML.

_wp_privacy_account_request_confirmed() – Update log when privacy request is confirmed.

_wp_privacy_action_request_types() – Get all user privacy request types.

_wp_privacy_completed_request() – Marks a request as completed by the admin and logs the current timestamp.

_wp_privacy_hook_requests_page() – Add requests pages.

_wp_privacy_requests_screen_options() – Add options for the privacy requests screens.

_wp_privacy_resend_request() – Resend an existing request and return the result.

_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_put_post_revision – action

_wp_put_post_revision() – Inserts post data into the posts table as a post revision.

_wp_relative_upload_path – filter

_wp_relative_upload_path() – Return relative path to an uploaded file.

_wp_translate_php_url_constant_to_key() – Translate a PHP_URL_* constant to the named array keys PHP uses.

_wp_translate_postdata() – Rename $_POST data from form names to DB post columns.

_wptexturize_pushpop_element() – Search for disabled element tags. Push element to stack on tag open and pop on tag close.

$action_prefilter – filter

$adjacent_post_link – filter