Check if session is really active

If you started and stopped a PHP session then session_id won't be empty (but session is closed). If you use session_status you can get the real state of a PHP session.

Author: ollea

src/facebook.php

@@ -55,8 +55,14 @@ class Facebook extends BaseFacebook
    * @see BaseFacebook::__construct
    */
   public function __construct($config) {
-    if (!session_id()) {
-      session_start();
+    if (function_exists('session_status')) {
+      if (session_status() !== PHP_SESSION_ACTIVE) {
+        session_start();
+      }
+    } else {
+      if (!session_id()) {
+        session_start();
+      }
     }
     parent::__construct($config);
     if (!empty($config['sharedSession'])) {