Question

I want to generate a serial key with this pattern :

DA-7470-20762

and this is what I have done so far :

$code = strtoupper(md5(uniqid(microtime(true), true)));
$uuid = sprintf("%02s-%04o-%04o",
    $code[0].$code[1],
    $code[2].$code[3].$code[4].$code[5],
    $code[6].$code[7].$code[8].$code[9]
);

But I want to prevent serial keys like this :

AB-0000-0001

I need to remove all 0’s, because they are so predictive.

Is there a way to set range for octal sprintf like [1-9]?

Answer 1

I’d probably go with something along these lines:

printf('%2s-%4o-%4o',
       chr(mt_rand(65, 70)) . chr(mt_rand(65, 70)),
       mt_rand(01000, 07777),
       mt_rand(01000, 07777));