php將session寫入memcache中。

<?php  class MemSession  {   private static $handler=null;   private static $lifetime=null;   private static $time= null;   const NS='session_';      private static  function init($handler){   self::$handler=$handler;   self::$lifetime=ini_get('session.gc_maxlifetime');         self::$time=time();   }      public static function start(Memcache $memcache){   self::init($memcache);      session_set_save_handler(      array(__CLASS__,"open"),      array(__CLASS__,"close"),      array(__CLASS__,"read"),      array(__CLASS__,"write"),      array(__CLASS__,"destroy"),      array(__CLASS__,"gc")   );   session_start();   }      public static function open($path,$name){   return true;   }      public static function close(){   return true;   }      public static function read($PHPSESSID){   $out=self::$handler->get(self::session_key($PHPSESSID));   if ($out===false || $out==null) {   return '';   }   return $out;   }      public static function write($PHPSESSID,$data){    $method=$data ? 'set':'replace';    return self::$handler->$method(self::session_key($PHPSESSID),$data,MEMCACHE_COMPRESSED,self::$lifetime);   }      public static function destroy($PHPSESSID){   return self::$handler->delete(self::session_key($PHPSESSID));   }      public static function gc($lifetime){       return true;   }      private static function session_key($PHPSESSID){   $session_key=self::NS.$PHPSESSID;   return $session_key;    }  }    $memcache = new Memcache;  $memcache->connect("localhost",11211) or die("could not connect memcache");  MemSession::start($memcache);   /* foreach($options['servers'] as $server)  {$this->handler->$addServer($server['ip'],$server['port']);//echo $server['ip'];   }*/  ?>