PHP Shopping cart: How to update product quantity in cart using session variables?
PHP购物车：如何更新使用Session变量车产品的数量？
Each string is the name of an item, and the corresponding number in the associative array is the quantity of that item in the cart.
每个字符串都是一个商品的名称，关联数组中的对应数字就是购物车中该商品的数量。
For each item, calculate the total cost for that item using the quantity passed from the shopping cart information and the price obtained from the product catalog information in the database.
对于每个货品，使用从购物车信息传递的数量和从数据库中的产品目录信息获取的价格，计算该货品的总价。
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