Horde_Memcache::set PHP Method

    public function set($key, $var, $expire = 0)
    {
        return $this->_set($key, @serialize($var), $expire);
    }

 /**
  */
 public function set($key, $data, $lifetime = 0)
 {
     $key = $this->_params['prefix'] . $key;
     if ($this->_memcache->set($key . '_e', time(), $lifetime) !== false) {
         $this->_memcache->set($key, $data, $lifetime);
     }
 }