title: Access the Facebook signed_request when moving between pages inside an application? $facebook->getSignedRequest()
body: <p>I am installing an application inside of a Facebook page. I received the signed_request variable in my $_REQUEST, or when using the Facebook PHP SDK Facebook::getSignedRequest() function. However, inside my application when I go to a different page within the application, the signed_request does not follow it. </p>
  
  <p>I understand that it is placed inside the $_SESSION and the signed_request data is stored inside the session, but what method am I supposed to be calling in order to get that data? Do I have to strip it out of my session myself and not use the PHP SDK? I would expect getSignedRequest to always give me the same result as long as I am receiving it in the $_REQUEST or through the $_SESSION.</p>
  
  <p>Please advise! Thanks in advance!</p>