public static function getInstance($userAgent)
    {
        if (array_key_exists($userAgent, self::$deviceDetectorInstances)) {
            return self::$deviceDetectorInstances[$userAgent];
        }

        $deviceDetector = new DeviceDetector($userAgent);
        $deviceDetector->discardBotInformation();
        $deviceDetector->setCache(new DeviceDetectorCache(86400));
        $deviceDetector->parse();

        self::$deviceDetectorInstances[$userAgent] = $deviceDetector;

        return $deviceDetector;
    }