> But then, if the user entered 5 - 6, it should be -1 but it'd return > positive one... Is there another way?

Come on, man... this is addition and subtraction. You can't figure it out? > > You simply need the absolute value of the difference. So taking Stephen's > > example below.. > > > > $total = 0; Look, right here, you're setting the total to zero, so now everything will be subtracted from zero. If you want everything to be subtracted from the first number, the set $total equal to the first number and loop through the remainder. $total = $_POST['nums'][0]; $cnt = count($_POST['nums']); for($x=1;$x<$cnt;$x++) { $total -= $_POST['nums'][$x]; } And I'm sure your next post will be "but how will I use that if I want to go back to addition/multiplication/division???"; Here, assuming $mode can be set to "add","sub","mul" or "div": $total = $_POST['nums'][0]; $cnt = count($_POST['nums']); for($x=1;$x<$cnt;$x++) { switch($mode) { case "add": $total += $_POST['nums'][$x]; break; case "sub": $total -= $_POST['nums'][$x]; break; case "mul": $total *= $_POST['nums'][$x]; break; case "div": $total /= $_POST['nums'][$x]; break; } } echo $total; Plenty of other ways to do it, too, that may be more efficient. And I couldn't honestly tell you if *= and /= work and I don't want to go see. Hope that helps. Good luck. ---John Holmes... -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php