RandomGeneratorFactory example

public static function randomHex(): string
    {
        return bin2hex(self::randomBytes());
    }

    /** * same as Ramsey\Uuid\UuidFactory->uuidFromBytesAndVersion without using a transfer object */
    public static function randomBytes(): string
    {
        if (self::$generator === null) {
            self::$generator = new UnixTimeGenerator((new RandomGeneratorFactory())->getGenerator());
        }
        $bytes = self::$generator->generate();

        /** @var array<int> $unpackedTime */
        $unpackedTime = unpack('n*', substr($bytes, 6, 2));
        $timeHi = (int) $unpackedTime[1];
        $timeHiAndVersion = pack('n*', BinaryUtils::applyVersion($timeHi, 7));

        /** @var array<int> $unpackedClockSeq */
        $unpackedClockSeq = unpack('n*', substr($bytes, 8, 2));
        $clockSeqHi = (int) $unpackedClockSeq[1];