FUNGSI RANDOM

<?php
function RandUnik($panjang) {
   $pstring = "0123456789ABCDEFGHIJKLMZ";
   $plen = strlen($pstring);
      for ($i = 1; $i <= $panjang; $i++) {
          $start = rand(0,$plen);
          $unik.= substr($pstring, $start, 1);
      }

    return $unik;
}
$code = RandUnik('4');
$code2 = RandUnik('4');
$code3 = RandUnik('4');
$ic = 'ORDER-'.$code.'-'.$code2.'-'.$code3;
echo $ic;
?>