Why doesn't PHP code execute?

Question

PHP

//Это не работает и останавливает работу нижнего кода
$email = $_SESSION['email'];
$stmt = $dbh->prepare('SELECT `id` FROM `users` WHERE `email`=?');
$stmt->execute(array($email));
$id = $stmt->fetchColumn(); // индификатор пользователя

//Этот кусок работает:
  // Проверяем данные в запросе
  if (empty($_POST['id']))
  {
    echo "error id";
    exit;
  }
  if (empty($_POST['ball']))
  {
    echo "error ball";
    exit;
  }

Answer 1

Psychics on vacation.

Answer 2

If you find fault with the question, then it can not be executed only in the absence of an interpreter, otherwise, without seeing the picture (the result of the work, logs ...) to say something - it's like fingers in the sky.