public function getMetaData(string $key)
	{
		$key = $this->prefix . $key;

		$stored = $this->memcached->get($key);

		// if not an array, don't try to count for PHP7.2
		if (! is_array($stored) || count($stored) !== 3)
		{
			return false;
		}

		list($data, $time, $ttl) = $stored;

		return [
			'expire' => $time + $ttl,
			'mtime'  => $time,
			'data'   => $data,
		];
	}