title: PDO Prepared Statement Issue
body: <p>I have this prepared Statment:</p>
  
  <pre><code>$stmt = $dbh-&gt;prepare("select * from t where name like :name ");
  </code></pre>
  
  <p>Binding like this works:</p>
  
  <pre><code>$p = "%glas%";
  $stmt-&gt;bindParam(':name', $p );
  </code></pre>
  
  <p>If I put in the term direktly, it fails:</p>
  
  <pre><code>$stmt-&gt;bindParam(':name', "%glas%" );
  </code></pre>
  
  <p>What´s the difference?</p>