1 files changed, 14 insertions, 5 deletions
diff --git a/vendor/symfony/http-foundation/Session/Session.php b/vendor/symfony/http-foundation/Session/Session.php
index a46cffbb8d..f0379c1697 100644
--- a/vendor/symfony/http-foundation/Session/Session.php
+++ b/vendor/symfony/http-foundation/Session/Session.php
@@ -29,7 +29,7 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
     private $flashName;
     private $attributeName;
     private $data = array();
-    private $hasBeenStarted;
+    private $usageIndex = 0;
 
     /**
      * @param SessionStorageInterface $storage    A SessionStorageInterface instance
@@ -54,6 +54,8 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
      */
     public function start()
     {
+        ++$this->usageIndex;
+
         return $this->storage->start();
     }
 
@@ -142,13 +144,13 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
     }
 
     /**
-     * @return bool
+     * @return int
      *
      * @internal
      */
-    public function hasBeenStarted()
+    public function getUsageIndex()
     {
-        return $this->hasBeenStarted;
+        return $this->usageIndex;
     }
 
     /**
@@ -158,6 +160,7 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
      */
     public function isEmpty()
     {
+        ++$this->usageIndex;
         foreach ($this->data as &$data) {
             if (!empty($data)) {
                 return false;
@@ -182,6 +185,8 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
      */
     public function migrate($destroy = false, $lifetime = null)
     {
+        ++$this->usageIndex;
+
         return $this->storage->regenerate($destroy, $lifetime);
     }
 
@@ -190,6 +195,8 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
      */
     public function save()
     {
+        ++$this->usageIndex;
+
         $this->storage->save();
     }
 
@@ -230,6 +237,8 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
      */
     public function getMetadataBag()
     {
+        ++$this->usageIndex;
+
         return $this->storage->getMetadataBag();
     }
 
@@ -238,7 +247,7 @@ class Session implements SessionInterface, \IteratorAggregate, \Countable
      */
     public function registerBag(SessionBagInterface $bag)
     {
-        $this->storage->registerBag(new SessionBagProxy($bag, $this->data, $this->hasBeenStarted));
+        $this->storage->registerBag(new SessionBagProxy($bag, $this->data, $this->usageIndex));
     }
 
     /**