protected function _init() {
		$this->connection = $this->connection ?: new Memcached();
		$this->connection->addServers($this->_formatHostList($this->_config['host']));

		if ($this->_config['scope']) {
			$this->connection->setOption(Memcached::OPT_PREFIX_KEY, "{$this->_config['scope']}:");
		}
	}