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

$t_red=$t_red<0?0;$t_red;
$t_red=$t_red>=256?255;$t_red;


//are you sure you're modifying t_red here? and not t_green?
$t_red=$t_green<0?0;$t_red;
$t_red=$t_green>=256?255;$t_red;

//are you sure you're modifying t_red here? and not t_blue?
$t_red=$t_blue<0?0;$t_red;
$t_red=$t_blue>=256?255;$t_red;