title: Symfony2 get choice text
body: <p>If I use an integer as value on a form choice...</p>
  
  <pre><code>$builder
      -&gt;add('name')
      -&gt;add('phone')
      -&gt;add('time', 'choice', array(
          'choices' =&gt; array(
              1 =&gt; 'Morning',
              2 =&gt; 'Afternoon'
          )
      ))
  </code></pre>
  
  <p>Is there a way to access the option text?</p>
  
  <p>I mean, if I store <code>2</code> on my entity, how should I render <code>Afternoon</code>?</p>