mbam

<?php
// EXAMPLE USAGE
$array = generate();
echo $array[0];
echo "<br />";
echo $array[1];


// FUNCTION
function generate()
{
        $digilist = "0123456789ABCDEFGHJKLMNPQRTUVWXY";

        //now we generate a new random ID number using the substrings of the digitList string above
        $id = NULL;
        $id .= substr($digilist, rand(1, 9), 1); //random number
        $id .= substr($digilist, rand(10, 31), 1); //then a letter
        $id .= substr($digilist, rand(10, 31), 1); //another letter
        $id .= substr($digilist, rand(1, 9), 1); //a number
        $id .= substr($digilist, rand(1, 9), 1); //and finally another number - simple :D

    //ok so now we need to generate an MD5 hash of our ID
        $hash = md5($id);

        //cycle through the hash 16 (length of key) times (in steps of 2 because each hex bytes is 2 digits long)
        $i = 0;
        $key = NULL;
        for ($i; $i < 32; $i+=2)
        {
                //here we convert the next hex value to an integer and perform a bitwise AND operation against '31'
                //31 is the highest substring value in our digit list.
                $nextdigit = hexdec(substr($hash, $i, 2)) & 31;

                //if 'i' is divisable by 8 (every 4 cycles) then we want to add "-"
                if ((($i % 8) == 0) && ($i > 0))
                {
                        $key .= "-".substr($digilist, $nextdigit, 1);
                }
                else
                {
                        $key .= substr($digilist, $nextdigit, 1);
                }
        }

        $array = array($id, $key);
        //return
        return $array;
}
?>