title: PDO Insert doesn't work
body: <p>This day is my first time using PDO. And when I try 'INSERT' with PDO, it does nothing.</p>
  
  <p>This is my code :</p>
  
  <pre><code>session_start();
  if($_GET['feedback']!="")
  {
      $fb = $_GET['feedback'];
  
      $date = date('Y-m-d H:i:s');
      $query = "INSERT INTO feedback(number, sender, content, date) VALUES (NULL,?,?,?)";
      $STH = $DBH-&gt;prepare($query);
      $STH-&gt;bindParam(1, $_SESSION['alias']);
      $STH-&gt;bindParam(2, $fb);
      $STH-&gt;bindParam(3, $date);
      $STH-&gt;execute();
  }
  </code></pre>
  
  <p>I have tried  a 'SELECT' query with PDO and it works.
  What should I do?</p>