مشکل این کد لاگین

public function login(){$pass=substr(hash('sha512',$_POST['password']),0,25);$res=$this->prepare('SELECT * FROM `company` WHERE `useame`=:useame AND `passsword`=:password');$res->bindParam(':useame', $_POST['useame'], PDO::PARAM_STR, 255);$res->bindParam(':password', $pass, PDO::PARAM_STR, 255);retu $res->fetchColumn();}