[Scott MacVicar]

If you are wanting to take something away use

PHP Code:

$var -= $value; 


this decreases $var by $value

you can also use += to increment

try

PHP Code:

$expneed = 50;
$expaddedneed = 0;
$tempexp = $exp;

while ($tempexp > 0) {
  $tempexp -= $expneed;
  $expaddedneed = $expaddedneed + 25;
  if (($tempexp == 0) || ($tempexp > 0)) {
        $level++;
    }
  $expneed += $expaddedneed;
    
}