you have a solution

[object0]

public function checkidentity( $user = null, $identity = null ) {
if ( $user === null ) {
$user = $this->username;
}
global $config_abs_path;
require_once( $config_abs_path."/classes/users.php" );
$usr = new users();
return $usr->checkIdentity( $user, $identity );
}

something like that...