Added compression support for Memcache driver

- Added config field: compress_data
- If compress_data is set, enabled compression in Memcache driver

Author: Jan Jurgens

src/phpFastCache/Core/phpFastCache.php

@@ -82,6 +82,7 @@ class phpFastCache
       'extensions' => array(),
       "cache_method"    =>  1, // 1 = normal, 2 = phpfastcache, 3 = memory
       "limited_memory_each_object"  =>  4000, // maximum size (bytes) of object store in memory
+      "compress_data" => false // compress stored data, if the backend supports it
     );
 
     /**

src/phpFastCache/Drivers/memcache.php

@@ -29,6 +29,11 @@ class memcache extends DriverAbstract
      */
     public $instant;
 
+    /**
+     * @var int
+     */
+    private $flags = 0;
+
     /**
      * phpFastCache_memcache constructor.
      * @param array $config
@@ -41,10 +46,13 @@ public function __construct($config = array())
         }
         if (class_exists('Memcache')) {
             $this->instant = new MemcacheSoftware();
+
+            if (isset($config[ 'compress_data' ]) &&  $config[ 'compress_data' ] === true) {
+                $this->flags = MEMCACHE_COMPRESSED;
+            }
         } else {
             $this->fallback = true;
         }
-
     }
 
     /**
@@ -113,10 +121,10 @@ public function driver_set(
         }
 
         if (isset($option[ 'skipExisting' ]) && $option[ 'skipExisting' ] == true) {
-            return $this->instant->add($keyword, $value, false, $time);
+            return $this->instant->add($keyword, $value, $this->flags, $time);
 
         } else {
-            return $this->instant->set($keyword, $value, false, $time);
+            return $this->instant->set($keyword, $value, $this->flags, $time);
         }
     }
 
@@ -127,7 +135,6 @@ public function driver_set(
      */
     public function driver_get($keyword, $option = array())
     {
-
         $this->connectServer();
 
         // return null if no caching