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diff --git a/lib/facebook-graph-sdk/src/Facebook/PersistentData/FacebookMemoryPersistentDataHandler.php b/lib/facebook-graph-sdk/src/Facebook/PersistentData/FacebookMemoryPersistentDataHandler.php
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+++ b/lib/facebook-graph-sdk/src/Facebook/PersistentData/FacebookMemoryPersistentDataHandler.php
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+<?php
+/**
+ * Copyright 2014 Facebook, Inc.
+ *
+ * You are hereby granted a non-exclusive, worldwide, royalty-free license to
+ * use, copy, modify, and distribute this software in source code or binary
+ * form for use in connection with the web services and APIs provided by
+ * Facebook.
+ *
+ * As with any software that integrates with the Facebook platform, your use
+ * of this software is subject to the Facebook Developer Principles and
+ * Policies [http://developers.facebook.com/policy/]. This copyright notice
+ * shall be included in all copies or substantial portions of the software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ */
+namespace Facebook\PersistentData;
+
+/**
+ * Class FacebookMemoryPersistentDataHandler
+ *
+ * @package Facebook
+ */
+class FacebookMemoryPersistentDataHandler implements PersistentDataInterface
+{
+    /**
+     * @var array The session data to keep in memory.
+     */
+    protected $sessionData = [];
+
+    /**
+     * @inheritdoc
+     */
+    public function get($key)
+    {
+        return isset($this->sessionData[$key]) ? $this->sessionData[$key] : null;
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function set($key, $value)
+    {
+        $this->sessionData[$key] = $value;
+    }
+}