title: zend framework - hidden element has no value even when specifying it
body: <p>I create a hidden element that way:</p>
  
  <pre><code>$this-&gt;addElement('hidden', 'id', '1');
  </code></pre>
  
  <p>but what I get is this:</p>
  
  <pre><code>&lt;input type="hidden" name="id" value="" id="id" /&gt;
  </code></pre>
  
  <p>I've also tried like this:</p>
  
  <pre><code>$this-&gt;addElement('hidden', 'id', array(
      'value' =&gt; 1
  ));
  </code></pre>
  
  <p>but it didn't work better.</p>
  
  <p>What's wrong?</p>