title: Access Facebook Session using PHP
body: <p>I am struggling to keep the Facebook session alive using PHP on my website.</p>
  
  <p>I use both the JavaScript SDK and the PHP SDK to form the basis of my app.</p>
  
  <p>The problem I am having is that when the "Facebook session" ends, my PHP script believes that you are logged out of Facebook. But, as soon as I call the <code>FB.init()</code> using the JavaScript SDK, the session comes back to life.</p>
  
  <p>Is there anyway to achieve the same using the PHP SDK? Or can I set a custom expiry time on the Facebook session?</p>
  
  <h2>Extracted from comments</h2>
  
  <p>It seems that the session expire time is set to 2 hours but I am not certain about this. I don't think calling the PHP api will make a difference. I need to explain a little clearer what is happening. Basically, if you arrive at my home page, you get the option to login via Facebook. If you do, this all works fine! Once you are logged in and you have authorized the app, this is okay until the session expires. When the session expires, it seems that the PHP SDK is unable to determine whether or not you are logged in via Facebook, however, the Javascript SDK is. I use getUser() for the PHP SDK.<br/><br/>
  In other words, because the session has expired, PHP thinks that you are no longer logged in via Facebook. The Javascript SDK is able to detect whether or not you are logged in, regardless of whether the session is there. When it realises you are, it recreates the session any way. But in order for the session to be picked up by PHP, the page obviously needs to be refreshed. This is the problem I have, because the page displays content based on your Facebook login, I need the PHP SDK to be able to recreate the session as well, so that it is not necessary to refresh the page.</p>