diff --git a/framework/yii/caching/Cache.php b/framework/yii/caching/Cache.php
index f9d117d..14f16c9 100644
--- a/framework/yii/caching/Cache.php
+++ b/framework/yii/caching/Cache.php
@@ -93,7 +93,7 @@ abstract class Cache extends Component implements \ArrayAccess
 	 * If the given key is a string containing alphanumeric characters only and no more than 32 characters,
 	 * then the key will be returned back prefixed with [[keyPrefix]]. Otherwise, a normalized key
 	 * is generated by serializing the given key, applying MD5 hashing, and prefixing with [[keyPrefix]].
-	 * 
+	 *
 	 * @param mixed $key the key to be normalized
 	 * @return string the generated cache key
 	 */
@@ -216,6 +216,21 @@ abstract class Cache extends Component implements \ArrayAccess
 	}
 
 	/**
+	 * Stores multiple items in cache. Each item contains a value identified by a key.
+	 * If the cache already contains such a key, the existing value and
+	 * expiration time will be replaced with the new ones, respectively.
+	 *
+	 * @param array $items the items to be cached, as key-value pairs. Each key can be a simple string or
+	 * a complex data structure consisting of factors representing the key.
+	 * @param integer $expire the number of seconds in which the cached value will expire. 0 means never expire.
+	 * @return boolean whether the items are successfully stored into cache
+	 */
+	public function mset($items, $expire = 0)
+	{
+		return false;
+	}
+
+	/**
 	 * Stores a value identified by a key into cache if the cache does not contain this key.
 	 * Nothing will be done if the cache already contains the key.
 	 * @param mixed $key a key identifying the value to be cached value. This can be a simple string or