Posted by Tom on 01/04/07 13:21

Hey

Wow!

Nice, exactly what I needed.

Thanks a lot!

Tom


"Toby Inkster" <usenet200701@tobyinkster.co.uk> wrote in message
news:2r0v64-o98.ln1@ophelia.g5n.co.uk...
> Tom wrote:
>
>> 10 => DFG56JKG4 => 10
>>
>> How do I accomplish that?
>
> How about this...
>
> define('MYSECRET','Some unguessable string');
>
> function int2code ($i)
> {
> $md5 = strtoupper(md5(MYSECRET.$i));
> $mdStart = substr($md5, 0, 4);
> $mdEnd = substr($md5, 28, 4);
> return $mdStart.$i.$mdEnd;
> }
>
> function code2int ($code)
> {
> preg_match('/^([A-F0-9]{4})([0-9]+)([A-F0-9]{4})$/', $code, $matches);
> $i = $matches[2];
>
> $md5 = strtoupper(md5(MYSECRET.$i));
> $mdStart = substr($md5, 0, 4);
> $mdEnd = substr($md5, 28, 4);
> if ($mdStart.$i.$mdEnd==$code)
> return $i;
>
> return FALSE; // Invalid code!
> }
>
> --
> Toby A Inkster BSc (Hons) ARCS
> Contact Me ~ http://tobyinkster.co.uk/contact
>

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