title: Facebook cookie and oauth 2.0 changes
body: <p>This function used to work for me until the other day when facebook decided to enforce some changes.</p>
  
  <pre><code>    function get_facebook_cookie() {
      $app_id             = '[MyAppID]';
      $application_secret = '[MyAppSecrect]';
  
      if(isset($_COOKIE['fbs_' . $app_id])){
          $args = array();
          parse_str(trim($_COOKIE['fbs_' . $app_id], '\\"'), $args);
          ksort($args);
          $payload = '';
          foreach ($args as $key =&gt; $value) {
                  if ($key != 'sig') {
                  $payload .= $key . '=' . $value;
                  }
          }
          if (md5($payload . $application_secret) != $args['sig']) {
                  return null;
          }
          return $args;
          } else {
           return null;
          }
  }
  </code></pre>
  
  <p>I was the able to get the FB users access token as easily as</p>
  
  <pre><code>$cookie['access_token']
  </code></pre>
  
  <p>Now it doesn't seem that I'm able to retrieve this info anymore.</p>
  
  <p>I was successfully (easily) able to make the required changes to my javascript code, but I'm kind of stumped on the php side.  As a quick side note I'm using codeigniter and I've had a lot of trouble trying to get the FB PHP SDK to play nice, also I havne't seen any examples of integrating the PHP 3 SDK into codeigniter so I'm looking for a quick and dirty solution that will allow me to get the access token from the cookie thus allowing me to use the following call to Facebooks API:</p>
  
  <pre><code>'https://api.facebook.com/method/friends.getAppUsers?access_token=' . $cookie['access_token'];
  </code></pre>
  
  <p>Any help is greatly appreciated.</p>