Doctrine\OXM\Id\UuidGenerator::generateV4 PHP Method

    public function generateV4()
    {
        return sprintf('%04x%04x%04x%04x%04x%04x%04x%04x', mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xfff) | 0x4000, mt_rand(0, 0x3fff) | 0x8000, mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff));
    }