2026* @since 5.6.02027*2028* @param int|false$user_id The user ID associated with the email,2029*orfalseif the email does not exist.2030* @param string$email The email to check for existence.2031*/2032returnapply_filters('email_exists',$user_id,$email);2033}20342035/**2036* Checks whether a username is valid.2037*2038* @since 2.0.1
History
Introduced in 5.6.0. Unchanged from 6.7.7 through 7.1.0.