2105* @since 5.6.02106*2107* @param int|false$user_id The user ID associated with the email,2108*orfalseif the email does not exist.2109* @param string$email The email to check for existence.2110*/2111returnapply_filters('email_exists',$user_id,$email);2112}21132114/**2115* Checks whether a username is valid.2116*2117* @since 2.0.1
History
Introduced in 5.6.0. Unchanged from 6.7.7 through 7.1.0.