如何解决无法通过引用传递参数3？

Question

   if($_REQUEST['action'] == 'addToCart' && !empty($_REQUEST['id'])){
         $productID = $_REQUEST['id'];
         // get product details
         $sql = "SELECT * FROM products WHERE id = ".$productID;
         $stmt = $db->prepare($sql);
         $stmt->execute();

         $row = $stmt->fetch(PDO::FETCH_ASSOC);
          $itemData = array(
             'id' => $row['id'],
             'name' => $row['name'],
             'price' => $row['price'],
             'qty' => 1
         );

         $insertItem = $cart->insert($itemData);
         $redirectLoc = $insertItem?'viewCart.php':'index.php';
         header("Location: ".$redirectLoc);

我想把这个产品名称，数量和价格 - 放在viewCart.php上。我是新来的请帮助我。