Someone

<?
echo "Test";
function undfuenfzehn($tound) {
	return bindec(substr(strval(decbin($tound)), -4, 4));
}

$c="SlVhGdvMF<s^P]";
$s="";

for($i=0;$i<strlen($c);$i++)
{
  $t1 = undfuenfzehn(ord(c[$i]))*16;
  echo $t1;
  $t2 = undfuenfzehn(ord(c[$i++]));
  echo $t2;
 // $t = $t1 | $t2;
  echo $t;
 // $s .= chr($t);
}

echo undfuenfzehn(20);
echo $s;
?>