random

function getrandomstring($length) {

       global $template;
       settype($template, "string");

       $template = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

       settype($length, "integer");
       settype($rndstring, "string");
       settype($a, "integer");
       settype($b, "integer");

       for ($a = 0; $a <= $length; $a++) {
               $b = rand(0, strlen($template) - 1);
               $rndstring .= $template[$b];
       }

       return $rndstring;
}


$i = 0;
do {

    $word = getrandomstring(4);
    $md5 = md5($word, TRUE);
    if (substr($md5, -3) == "/..") {
         echo $word;
         echo "\n";
         echo $md5;
         echo "\n";
     }


} while (True);