Question

Starting from a hex source, i want to convert it to a-zA-Z0-9.
base_convert() only supports as output a 32 base, that equals to a-z0-9. I need a base-62 output, for the additional A-Z (don’t know how to better explain, sorry).

I’m doing this (since that the community often ask) cause of i’m using openssl rand -hex as a source for random password (i would love to use rand() and so on, but i need to have lots of unique passwords, and rand() or even mt_rand() doesn’t provide enough casualty, password get repeated so often that the script locks down).

Thanks.

Answer 1

Try this:

function base62_encode($hex)
{
    $chars = 'abcdefghijklmnopqrstuwvxyzABCDEFGHIJKLMNOPQRSTUWVXYZ0123456789';
    $in = hexdec($hex);

    $result = '';

    while ($in > 0) {
        $i = $in % 62;
        $in = (int)($in / 62);

        $result = $chars[$i] . $result;
    }

    return $result;
}