Works perfectly on localhost but wont redirect live.
The redirect function is

PHP Code:
function redirect_to($location NULL){
    if (
$location != NULL) {
        
header("Location: {$location}");
        exit;
    }

and one of the pages not working is

PHP Code:
<?php 
    $pid 
$_POST['id'];
    
$q $_POST['qty'];

    
// if($pid<1 or $q<1) return;
 
    
if(is_array($_SESSION['cart'])){
        
// if(product_exists($pid)) return;
        
if(product_exists($pid)){
            
$max=count($_SESSION['cart']);
            for(
$i=0;$i<$max;$i++){
                if(
$_SESSION['cart'][$i]['productid'] == $pid){
                    
$_SESSION['cart'][$i]['qty'] = $_SESSION['cart'][$i]['qty'] + $q;
                }
            }
        }else{
            
$max=count($_SESSION['cart']);
            
$_SESSION['cart'][$max]['productid']=$pid;
            
$_SESSION['cart'][$max]['qty']=$q;
        }        
    }
    else{
        
$_SESSION['cart']=array();
        
$_SESSION['cart'][0]['productid']=$pid;
        
$_SESSION['cart'][0]['qty']=$q;
    }
    
redirect_to("viewcart.html");
?>
Thanks in advance for the help