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__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.

_crop_image_resource() – Crops an image resource. Internal use only.

_deep_replace() – Perform a deep string replace operation to ensure the values in $search are no longer present

_fetch_remote_file() – Retrieve URL headers and content using WP HTTP Request API.

_flip_image_resource() – Flips an image resource. Internal use only.

_get_random_header_data() – Get random header image data from registered images in theme.

_get_wptexturize_shortcode_regex() – Retrieve the regular expression for shortcodes.

_get_wptexturize_split_regex() – Retrieve the combined regular expression for HTML and shortcodes.

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

_list_meta_row() – Outputs a single row of public meta data in the Custom Fields meta box.

_oembed_rest_pre_serve_request() – Hooks into the REST API output to print XML instead of JSON.

_post_format_request() – Filters the request to allow for the format prefix.

_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.

_upgrade_422_remove_genericons() – Cleans up Genericons example files.

_wp_dashboard_recent_comments_row() – Outputs a row for the Recent Comments widget.

_wp_get_attachment_relative_path() – Get the attachment path relative to the upload directory.

_wp_get_post_revision_version() – Gets the post revision version.

_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_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_request_confirmation_notification() – Notify the site administrator via email when a request is confirmed.

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

_wp_register_meta_args_whitelist() – Filter out `register_meta()` args based on a whitelist.

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

_wp_remove_unregistered_widgets() – Compares a list of sidebars with their widgets against a whitelist.

_wp_render_title_tag() – Displays title tag with content.

_wp_upgrade_revisions_of_post() – Upgrade the revisions author, add the current post as a revision and set the revisions version to 1

add_rewrite_endpoint() – Add an endpoint, like /trackback/.

add_rewrite_rule() – Adds a rewrite rule that transforms a URL structure to a set of query vars.

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

add_role() – Add role, if it does not exist.

adjacent_posts_rel_link_wp_head() – Displays relational links for the posts adjacent to the current post for single post pages.

adjacent_posts_rel_link() – Displays the relational links for the posts adjacent to the current post.

Admin::register_hooks() – Initializes the integration.

allowed_http_request_hosts() – Whitelists allowed redirect hosts for safe HTTP requests as well.

AMFReader::readArray() –

AMFReader::readBoolean() –

AMFReader::readData() –

AMFReader::readDate() –

AMFReader::readDouble() –

AMFReader::readLongString() –

AMFReader::readMixedArray() –

AMFReader::readObject() –

AMFReader::readString() –

AMFReader::readTypedObject() –

AMFReader::readXML() –

AMFStream::read() –

AMFStream::readByte() –

AMFStream::readDouble() –

AMFStream::readInt() –

AMFStream::readLong() –

AMFStream::readLongUTF() –

AMFStream::readUTF() –

apply_filters_ref_array() – Execute functions hooked on a specific filter hook, specifying arguments in an array.

array_replace_recursive() – PHP-agnostic version of {@link array_replace_recursive()}.

auth_redirect() – Checks if a user is logged in, if not it redirects them to the login page.

Automatic_Upgrader_Skin::request_filesystem_credentials() – Determines whether the upgrader needs FTP/SSH details in order to connect to the filesystem.

AVCSequenceParameterSetReader::readData() –

bloginfo_rss() – Display RSS container for the bloginfo function.

Bulk_Upgrader_Skin::reset() –

can_retrieve_data() – Determines whether or not data can be retrieved for the registered endpoints.

cancel_comment_reply_link() – Display HTML content for cancel comment reply link.

check_admin_referer() – Makes sure that a user was referred from another admin page.

check_ajax_referer() – Verifies the Ajax request to prevent processing requests external of the blog.

check_password_reset_key() – Retrieves a user row based on password reset key and login

ClassLoader::register() – Registers this instance as an autoloader.

Client::remove_access_token() – Removes an access token from the list of access token.

Client::remove_access_token() – Removes an access token from the list of access token.

Client::remove_access_token() – Removes an access token from the list of access token.

Client::request() –

Client::requestAsync() –

comment_author_rss() – Display the current comment author in the feed.

comment_reply_link() – Displays the HTML content for reply to comment link.

comment_text_rss() – Display the current comment content for use in the feeds.

comments_rss_link() – Print RSS comment feed link.

comments_rss() – Return link to the post RSS feed.

Container::raw() – Gets a parameter or the closure defining an object.

Container::register() – Registers a service provider.

CookieJar::removeCookieIfEmpty() – If a cookie already exists and the server asks to set it again with a null value, the cookie must be deleted.

create_initial_rest_routes() – Registers default REST API routes.

CurlFactory::release() –