$kullanicisor=$db->prepare("SELECT * FROM kullanici where kullanici_mail=:mail");
$kullanicisor->execute(array(
  'mail' => $_SESSION['kullanici_mail']
  ));
$say=$kullanicisor->rowCount();
$kullanicicek=$kullanicisor->fetch(PDO::FETCH_ASSOC);

if ($say==0) {

  Header("Location:login.php?durum=izinsiz");
  exit;

}