Sanitizes a string key.

Sends a confirmation request email when a change of user email address is attempted.

Send a HTTP header to disable content type sniffing in browsers which support it.

Set the current screen object

Changes the current user by ID or name.

Displays settings errors registered by add_settings_error().

Displays an admin notice to upgrade all sites after a core upgrade.

Retrieves the URL for the current site where WordPress application files (e.g. wp-blog-header.php or the wp-admin/ folder) are accessible.

Synchronizes category and post tag slugs when global terms are enabled.

Determines whether the taxonomy name exists.