the redirect is not working on live server

Question

This is the link to the site on test domain Domain Link

The problem im having is removing an item from the cart. everything works on my local host but as soon as i uploaded it to live server the remove item from cart stoped working. Can someone please tell me where im going wrong. thanks team.

<?php
    include_once("../php/cart_config.php");
    session_start();


    //add item in shopping cart
    if(isset($_POST["type"]) && $_POST["type"]=='add')
    {
        $product_code   = filter_var($_POST["product_code"], FILTER_SANITIZE_STRING); //product code
        $return_url     = base64_decode($_POST["return_url"]); //return url

        //MySqli query - get details of item from db using product code
        $results = $mysqli->query("SELECT product_name,price FROM products WHERE product_code='$product_code' LIMIT 1");
        $obj = $results->fetch_object();

        if ($results) { //we have the product info 

            //prepare array for the session variable
            $new_product = array(array('name'=>$obj->product_name, 'code'=>$product_code, 'qty'=>1, 'price'=>$obj->price));

            if(isset($_SESSION["products"])) //if we have the session
            {
                $found = false; //set found item to false

                foreach ($_SESSION["products"] as $cart_itm) //loop through session array
                {
                    if($cart_itm["code"] == $product_code){ //the item exist in array
                        $qty = $cart_itm["qty"]+1; //increase the quantity
                        $product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$qty, 'price'=>$cart_itm["price"]);
                        $found = true;
                    }else{
                        //item doesn't exist in the list, just retrive old info and prepare array for session var
                        $product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$cart_itm["qty"], 'price'=>$cart_itm["price"]);
                    }
                }

                if($found == false) //we didn't find item in array
                {
                    //add new user item in array
                    $_SESSION["products"] = array_merge($product, $new_product);
                }else{
                    //found user item in array list, and increased the quantity
                    $_SESSION["products"] = $product;
                }

            }else{
                //create a new session var if does not exist
                $_SESSION["products"] = $new_product;
            }

        }
        //redirect back to original page
        header('Location:'.$return_url);
    }

    //remove item from shopping cart
    if(isset($_GET["removep"]) && isset($_GET["return_url"]) && isset($_SESSION["products"]))
    {
        $product_code   = $_GET["removep"]; //get the product code to remove
        $return_url = base64_decode($_GET["return_url"]); //get return url

        foreach ($_SESSION["products"] as $cart_itm) //loop through session array var
        {
            if($cart_itm["code"]==$product_code){ //item exist in the list

                //continue only if quantity is more than 1
                //removing item that has 0 qty
                if($cart_itm["qty"]>1) 
                {
                $qty = $cart_itm["qty"]-1; //just decrese the quantity
                //prepare array for the products session
                $product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$qty, 'price'=>$cart_itm["price"]);
                }

            }else{
                $product[] = array('name'=>$cart_itm["name"], 'code'=>$cart_itm["code"], 'qty'=>$cart_itm["qty"], 'price'=>$cart_itm["price"]);
            }

            //set session with new array values
            $_SESSION["products"] = $product;
        }
        //redirect back to original page
        header('Location:'.$return_url);
    }
    ?>

Answer 1

PHP header can not be output if HTML is already displayed. You could use Javascript instead.

?>
 <script type="text/javascript">
   window.location = "<?php echo $return_url; ?>";
 </script>
<?php

This wil do the same, but it will always work!