title: Symfony ChoiceType $choices - labels and values swapped
body: <p>Symfony 2.8.2</p>
  
  <p>According to the Symfony docs "The choices option is an array, where the array key is the item's label and the array value is the item's value"</p>
  
  <p><a href="http://symfony.com/doc/2.8/reference/forms/types/choice.html#choices" rel="nofollow noreferrer">http://symfony.com/doc/2.8/reference/forms/types/choice.html#choices</a></p>
  
  <p>But with the following form I'm seeing the exact opposite:</p>
  
  <pre><code>        $filterForm = $this-&gt;createFormBuilder()
          -&gt;add('vendorName', ChoiceType::class, array(
              'expanded' =&gt; true,
              'multiple' =&gt; true,
              'choices'  =&gt; array('label' =&gt; 'value') // &lt;-- HERE
          ))
          -&gt;add('filter', SubmitType::class, array('label' =&gt; 'Filter'))
          -&gt;getForm();
  </code></pre>
  
  <p>Renders like this:</p>
  
  <p><a href="https://i.stack.imgur.com/tPnWb.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tPnWb.png" alt="Label is value and the value is label"></a></p>
  
  <p>Is the documentation wrong? Or am I not getting it right?</p>