'; // Set version to 0100 $data[6] = chr(ord($data[6]) & 0x0f | 0x40); // Set bits 6-7 to 10 $data[8] = chr(ord($data[8]) & 0x3f | 0x80); // Output the 36 character UUID. $uuid = vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4)); return $uuid; } }