Checks whether a username is valid.
Parameters
$username
stringrequired- Username.
Source
* @since 2.0.0
*
* @param string $username The username to check for existence.
* @return int|false The user ID on success, false on failure.
*/
function username_exists( $username ) {
$user = get_user_by( 'login', $username );
if ( $user ) {
$user_id = $user->ID;
} else {
$user_id = false;
}
/**
Example