Online PHP editor | refs for ovhGJ

@ 2014-09-16T09:56:21Z

<?php
$chars = array(0,1,2,3,4,5,6,7,8,9);
$serial = '';
$max = count($chars)-1;
for($i=0;$i<20;$i++){
    $serial .= (!($i % 5) && $i ? '-' : '').$chars[rand(0, $max)];
}
echo $serial;