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APIs
__() – Retrieve the translation of $text.
__checked_selected_helper() – Private helper function for checked, selected, disabled and readonly.
__clear_multi_author_cache() – Helper function to clear the cache for number of authors.
__construct() – Create a new cache object
__get_option() – Utility version of get_option that is private to installation/upgrade.
__ngettext_noop() – Register plural strings in POT file, but don’t translate them.
__ngettext() – Retrieve the plural or single form based on the amount.
__return_empty_array() – Returns an empty array.
__return_empty_string() – Returns an empty string.
__return_false() – Returns false.
__return_null() – Returns null.
__return_true() – Returns true.
__return_zero() – Returns 0.
_() – WordPress implementation for PHP functions either missing from older PHP versions or not included by default.
_access_denied_splash() – Displays an access denied message when a user tries to view a site’s dashboard they do not have access to.
_add_block_template_info() – Attempts to add custom template information to the template item.
_add_block_template_part_area_info() – Attempts to add the template part’s area information to the input template.
_add_default_theme_supports() – Adds default theme supports for block themes when the ‘setup_theme’ action fires.
_add_plugin_file_editor_to_tools() – Adds the ‘Plugin File Editor’ menu item after the ‘Themes File Editor’ in Tools for block themes.
_add_post_type_submenus() – Add submenus for post types.
_add_template_loader_filters() – Adds necessary filters to use ‘wp_template’ posts instead of theme template files.
_add_themes_utility_last() – Adds the ‘Theme File Editor’ menu item to the bottom of the Appearance (non-block themes) or Tools (block themes) menu.
_admin_bar_bump_cb() – Prints default admin bar callback.
_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.
_admin_search_query() – Displays the search query.
_ajax_wp_die_handler() – Kills WordPress execution and displays Ajax response with an error message.
_autop_newline_preservation_helper() – Newline preservation help function for wpautop
_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_block_template_result_from_file() – Build a unified template object based on a theme file.
_build_block_template_result_from_post() – Build a unified template object based a post Object.
_build_template_result_from_post() – Build a unified template object based a post Object.
_c() – Retrieve translated string with vertical bar context
_canonical_charset() – Retrieve a canonical form of the provided charset appropriate for passing to PHP functions such as htmlspecialchars() and charset html attributes.
_cleanup_header_comment() – Strip close comment and close php tags from file headers used by WP.
_cleanup_image_add_caption() – Private preg_replace callback used in image_add_caption()
_clear_modified_cache_on_transition_comment_status() – Clear the lastcommentmodified cached value when a comment status is changed.
_close_comments_for_old_post() – Close comments on an old post. Hooked to comments_open and pings_open.
_close_comments_for_old_posts() – Close comments on old posts on the fly, without any extra DB queries. Hooked to the_posts.
_config_wp_home() – Retrieve the WordPress home page URL.
_config_wp_siteurl() – Retrieve the WordPress site URL.
_copy_dir() – Copies a directory from one location to another via the WordPress Filesystem Abstraction.
_copy_image_file() – Copy an existing image file.
_count_posts_cache_key() – Return the cache key for wp_count_posts() based on the passed arguments.
_crop_image_resource() – Crops an image resource. Internal use only.
_custom_background_cb() – Default custom background callback.
_custom_header_background_just_in_time() – Registers the internal custom header and background routines.
_custom_logo_header_styles() – Adds CSS to hide header text for custom logo, based on Customizer setting.
_customizer_mobile_viewport_meta() – Adds viewport meta for mobile in Customizer.
_deep_replace() – Perform a deep string replace operation to ensure the values in $search are no longer present
_default_wp_die_handler() – Kills WordPress execution and displays HTML page with an error message.
_delete_attachment_theme_mod() – Checks an attachment being deleted to see if it’s a header or background image.
_delete_custom_logo_on_remove_site_logo() – Removes the custom_logo theme-mod when the site_logo option gets deleted.
_delete_option_fresh_site() – Delete the fresh site option.
_delete_site_logo_on_remove_custom_logo_on_setup_theme() – Hooks `_delete_site_logo_on_remove_custom_logo` in `update_option_theme_mods_$theme`.
_delete_site_logo_on_remove_custom_logo() – Deletes the site_logo when the custom_logo theme mod is removed.
_delete_site_logo_on_remove_theme_mods() – Deletes the site logo when all theme mods are being removed.
_deprecated_argument() – Mark a function argument as deprecated and inform when it has been used.
_deprecated_constructor() – Marks a constructor as deprecated and informs when it has been used.
_deprecated_file() – Mark a file as deprecated and inform when it has been used.
_deprecated_function() – Mark a function as deprecated and inform when it has been used.
_deprecated_hook() – Marks a deprecated action or filter hook as deprecated and throws a notice.
_device_can_upload() – Test if the current device has the capability to upload files.
_disable_block_editor_for_navigation_post_type() – Disables block editor for wp_navigation type posts so they can be managed via the UI.
_disable_content_editor_for_navigation_post_type() – This callback disables the content editor for wp_navigation type posts.
_doing_it_wrong() – Mark something as being incorrectly called.
_draft_or_post_title() – Get the post title.
_e() – Display translated text.
_enable_content_editor_for_navigation_post_type() – This callback enables content editor for wp_navigation type posts.
_ex() – Display translated string with gettext context.
_excerpt_render_inner_blocks() – Render inner blocks from the allowed wrapper blocks for generating an excerpt.
_excerpt_render_inner_columns_blocks() – Render inner blocks from the `core/columns` block for generating an excerpt.
_fetch_remote_file() – Retrieve URL headers and content using WP HTTP Request API.
_filter_block_template_part_area() – Checks whether the input ‘area’ is a supported value.
_filter_query_attachment_filenames() – Filter the SQL clauses of an attachment query to include filenames.
_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.
_fix_attachment_links() – Replace hrefs of attachment anchors with up-to-date permalinks.
_flatten_blocks() – Returns an array containing the references of the passed blocks and their inner blocks.
_flip_image_resource() – Flips an image resource. Internal use only.
_future_post_hook() – Hook used to schedule publication for a post marked for the future.
_get_additional_user_keys() – Returns a list of meta keys to be (maybe) populated in wp_update_user().
_get_admin_bar_pref() – Retrieve the admin bar display preference of a user.
_get_block_template_file() – Retrieves the template file from the theme for a given slug.
_get_block_templates_files() – Retrieves the template files from the theme.
_get_block_templates_paths() – Finds all nested template part file paths in a theme’s directory.
_get_component_from_parsed_url_array() – Retrieve a specific component from a parsed URL array.
_get_cron_array() – Retrieve cron info array option.
_get_cron_lock() – Retrieves the cron lock.
_get_custom_object_labels() – Build an object with custom-something object (post type, taxonomy) labels out of a custom-something object
_get_dropins() – Returns drop-ins that WordPress uses.
_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_non_cached_ids() – Retrieve IDs that are not already present in the cache.
_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.
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