更新购物车数量仅更新一种产品

Question

我正试图使用​​一个按钮来更新我所有的购物车数量，但它不起作用

我已通过会话将产品添加到购物车，现在显示购物车中的产品只是想更新数量，而不是更新

if(isset($_POST["updates"])) { 
    if(isset($_SESSION["shopping_cart"])) {

        $pid=$_POST['proid'];
        $qty =$_POST['quantity'];

        foreach ($_SESSION['shopping_cart'] as $key => $value) {
            if ($value['item_id'] == $_POST['proid']) {

                $_SESSION['shopping_cart'][$key]['item_qty'] = $_POST['quantity'];
            }
        } 

         $_SESSION['shopping_cart'] = array_values($_SESSION['shopping_cart']);

         header('Refresh:0');
    }
}

@RiggsFolly这是打印结果

Array ( 
    [0] => Array ( 
            [item_id] => 24 
            [item_name] => something 
            [item_price] => 800 
            [item_qty] => 1 
        ) 
    [1] => Array ( 
            [item_id] => 26 
            [item_name] => Fishly 
            [item_price] => 450 
            [item_qty] =>
        ) 
)