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__return_true() – Returns true.

_add_post_type_submenus() – Add submenus for post types.

_add_themes_utility_last() – Adds the (theme) ‘Editor’ link to the bottom of the Appearance menu.

_block_template_render_title_tag() – Displays title tag with content, regardless of whether theme has title-tag support.

_block_template_render_without_post_block_context() – Removes post details from block context when rendering a block template.

_block_template_viewport_meta_tag() – Renders a ‘viewport’ meta tag.

_build_template_result_from_post() – Build a unified template object based a post Object.

_delete_attachment_theme_mod() – Checks an attachment being deleted to see if it’s a header or background image.

_draft_or_post_title() – Get the post title.

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

_get_list_table() – Fetches an instance of a WP_List_Table class.

_get_meta_table() – Retrieve the name of the metadata table for the specified object type.

_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_template_edit_filename() – Tidies a filename for url display by the theme editor.

_get_term_children() – Get the subset of $terms that are descendants of $term_id.

_get_term_hierarchy() – Retrieves children of taxonomy as Term IDs.

_links_add_target() – Callback to add a target attribute to all links in passed content.

_load_image_to_edit_path() – Retrieve the path or URL of an attachment’s attached file.

_load_textdomain_just_in_time() – Loads plugin and theme textdomains just-in-time.

_maybe_update_themes() – Check themes versions only after a duration of time.

_override_custom_logo_theme_mod() – Overrides the custom logo with a site logo, if the option is set.

_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_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_term_caches() – Adds any terms from the given IDs to the cache that do not already exist in cache.

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

_remove_theme_support() – Do not use. Removes theme support internally without knowledge of those not used by themes directly.

_response_to_rss() – Retrieve

_sanitize_text_fields() – Internal helper function to sanitize a string from user input or from the db

_search_terms_tidy() – Formerly used internally to tidy up the search terms.

_split_shared_term() – Create a new term for a term_taxonomy item that currently shares its term with another term_taxonomy.

_strip_template_file_suffix() – Strips .php or .html suffix from template file names.

_sync_custom_logo_to_site_logo() – Updates the site_logo option when the custom_logo theme-mod gets updated.

_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.

_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_term_count_on_transition_post_status() – Update the custom taxonomies’ term counts when a post’s status is changed.

_usort_terms_by_ID() – Sort categories by ID.

_usort_terms_by_name() – Sort categories by name.

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

_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_delete_tax_menu_item() – Serves as a callback for handling a menu item when its original object is deleted.

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

_WP_Editors::get_translation() –

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

_wp_filter_taxonomy_base() – Filters the URL base for taxonomies.

_WP_List_Table_Compat

_WP_List_Table_Compat::__construct() –

_WP_List_Table_Compat::get_column_info() –

_WP_List_Table_Compat::get_columns() –

_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() – Returns HTML for the post thumbnail meta box.

_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_render_title_tag() – Displays title tag with content.

_wp_timezone_choice_usort_callback() – Sort-helper for timezones.

_wp_to_kebab_case() – This function is trying to replicate what lodash’s kebabCase (JS library) does in the client.

_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.

$old_status_to_$new_status – action

$taxonomy_term_edit_form_tag – action

$taxonomy_term_edit_form_top – action

$taxonomy_term_new_form_tag – action

$type_send_to_editor_url – filter

$type_template – filter

$type_template_hierarchy – filter

add_$meta_type_meta – action

add_$meta_type_metadata – filter

add_existing_user_to_blog() – Add a user to a blog based on details from maybe_add_existing_user_to_blog().

add_meta_boxes_$post_type – action

add_new_user_to_blog() – Adds a newly created user to the appropriate blog

add_post_type_support() – Registers support of certain features for a post type.

add_rewrite_tag() – Add a new rewrite tag (like %postname%).

add_tag_form – action

add_tag_form_fields – action

add_tag_form_pre – action

add_term_meta() – Adds metadata to a term.

add_term_metadata – filter

add_term_relationship – action

add_theme_page() – Add submenu page to the Appearance main menu.

add_theme_support() – Registers theme support for a given feature.

add_thickbox() – Enqueues the default ThickBox js and css.

add_trashed_suffix_to_trashed_posts – filter

add_user_to_blog – action

add_user_to_blog() – Adds a user to a blog, along with specifying the user’s role.

added_$meta_type_meta – action

added_term_meta – action

added_term_relationship – action

admin_comment_types_dropdown – filter

admin_footer_text – filter

admin_post_thumbnail_html – filter

admin_post_thumbnail_size – filter

admin_title – filter