修复 getMulti 方式获取缓存无效的问题

upload/source/class/memory/memory_driver_apc.php

@@ -22,10 +22,6 @@ class memory_driver_apc
 		return apc_fetch($key);
 	}
 
-	public function getMulti($keys) {
-		return apc_fetch($keys);
-	}
-
 	public function set($key, $value, $ttl = 0) {
 		return apc_store($key, $value, $ttl);
 	}

upload/source/class/memory/memory_driver_apcu.php

@@ -20,10 +20,6 @@ class memory_driver_apcu {
 		return apcu_fetch($key);
 	}
 
-    public function getMulti($keys) {
-        return apcu_fetch($key);
-    }
-
 	public function set($key, $value, $ttl = 0) {
 		return apcu_store($key, $value, $ttl);
 	}