Filters whether the given username exists.
$user_idint|false$usernamestringwp-includes/user.php:2079username_exists() * @since 4.9.0 * * @param int|false $user_id The user ID associated with the username, * or false if the username does not exist. * @param string $username The username to check for existence. */ return apply_filters( 'username_exists', $user_id, $username );} /** * Determines whether the given email exists. * * For more information on this and similar theme functions, check outIntroduced in 4.9.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.