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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.

_edd_anonymize_payment() – Given a payment ID, anonymize the data related to that payment.

_edd_privacy_get_customer_id_for_email() – Since our eraser callbacks need to look up a stored customer ID by hashed email address, developers can use this to retrieve the customer ID associated with an email address that’s being requested to be deleted even after the customer has been anonymized.

_edd_privacy_get_payment_action() – Given an EDD_Payment, determine what action should be taken during the eraser processes.

_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() – 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.

_manually_load_plugin() –

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

_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.

activate_plugin() – Attempts activation of plugin in a "sandbox" and redirects on success.

activate_plugins() – Activate multiple plugins.

activate_sitewide_plugin() – Deprecated functionality for activating a network-only plugin.

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