public function read($key) {
		$path = $this->_config['path'];

		return function($self, $params) use (&$path) {
			extract($params);
			$path = "$path/$key";
			$file = new SplFileInfo($path);

			if (!$file->isFile() || !$file->isReadable())  {
				return false;
			}

			$data = file_get_contents($path);
			preg_match('/^\{\:expiry\:(\d+)\}\\n/', $data, $matches);
			$expiry = $matches[1];

			if ($expiry < time()) {
				unlink($path);
				return false;
			}
			return preg_replace('/^\{\:expiry\:\d+\}\\n/', '', $data, 1);
		};
	}