=ord("n")) & ($j<=ord("z"))) | ($j>=ord("N")) & ($j<=ord("Z"))) { $j=$j-13; } elseif ((($j>=ord("a")) & ($j<=ord("m"))) | ($j>=ord("A")) & ($j<=ord("M"))) { $j=$j+13; } $new.=chr($j); } echo "rot13: $new"; } ?>