php multiple if conditions

Question

when i try to filter all these parameters php only enters in the first if conditions, ignoring all others conditions.

if($t_red<0){
    $t_red=0;
}

else if($         


        

Answer 1

Probably best suited if ran through a filtering function.

function setParam($param) {
  if($param < 0) {
    $param = 0;
  } elseif($param > 256) {
    $param = 255;
  }

  return $param;
}

$t_green = setParam($t_green);
$t_red = setParam($t_red);
$t_blue = setParam($t_blue);

You could also use pass-by-reference if necessary.