title: Symfony can changing the 'secret' parameter break anything?
body: <p>In the <strong>parameters.yml</strong> file there is a parameter named <strong>secret</strong> which defaults to <code>ThisTokenIsNotSoSecretChangeIt</code> but it should be changed to something else.</p>
  
  <p>What happens if the value of this parameter is changed in production? Can it break anything? </p>