title: Symfony2 serialze entity escape backslash from output
body: <p>Hi I am using Symfony2 for my application. I am using the serializer component.</p>
  
  <pre><code>    $encoder = new JsonEncoder();
      $normalizer = new GetSetMethodNormalizer();
  
      $callback = function ($dateTime) {
          return $dateTime instanceof \DateTime
              ? $dateTime-&gt;format(\DateTime::ISO8601)
              : '';
      };
  
      $normalizer-&gt;setCallbacks(array('matchAStartTime' =&gt; $callback, 'matchBStartTime'=&gt; $callback, 'matchDate'=&gt; $callback));
      $normalizer-&gt;setIgnoredAttributes(array('createdAt', 'updatedAt'));
      $serializer = new Serializer(array($normalizer), array($encoder));
      $json = $serializer-&gt;serialize($entity, 'json');
  </code></pre>
  
  <p>but in the output i am having response like this:</p>
  
  <pre><code>\"id\":1,\"matchAStatus\":\"Live\"
  </code></pre>
  
  <p>my question is how can I remove that slash in output? I know in raw php there is option for escape backslash but what can I use in Symfony?</p>