电子商务：智能购物车。
假设一个用户来到我的网站并购买了一个棚屋。棚屋将被添加到购物车中并完成工作。 在我的数据库中，我已经有了棚屋的尺寸（以向客户显示）。
假设客户还想要为棚屋铺一块地毯（你永远不知道），我希望我的 Web 应用程序能够自动了解地毯将用于棚屋，并且只允许用户从下拉框中选择最大平方米棚子的尺寸。我举个例子：
棚=1.83mx 2.44mx 1.55=（宽x深x高） 为了计算平方米，我将宽度和深度相乘 == 4.46 -> 5 将是我的最大平方米变量。 如何根据购物车中的内容更新地毯产品...比如我的棚屋。
感谢您的宝贵时间，并对没有代码表示歉意，我希望您能理解我的意思，我在atm上绕圈子。
Say a user came onto my website and bought a shed. The shed would be added to the cart and job done.
In my database I have the shed's dimensions already (to display to the customer).
Say the customer also wanted a carpet for the shed (you never know) I want my web application to automatically understand that the carpet will be for the shed and will only allow a user to select a maximum square meter from a drop down box based on the dimensions of the shed. I'll give an example:
Shed = 1.83m x 2.44m x 1.55 = (width x depth x height)
To calculate the square meters I'd multiply width and depth == 4.46 -> 5 would be my maximum square meter variable.
How do I update the CARPET product based on what's in the shopping cart... like my shed.
Thanks for your time, and apologies for no code, I hope you understand what I mean I'm running in circles atm.
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如果您的访客购物车存储在 $_SESSION 中，您可以让项目页面 (a) 检查 CARPET 是否正在被浏览，如果是，则 (b) 解析 $_SESSION 以查看访客购物车是否包含 SHED。如果是这样，它就可以根据访客选择的棚屋尺寸（也存储在 $_SESSION 中）计算地毯面积。
If your visitor cart was stored in the $_SESSION, you could have the item page (a) check to see if CARPETs are being browsed, and if so (b) parse the $_SESSION to see if the visitor cart contains a SHED. If so, it could then calculate the carpet area based on the visitor's chosen shed dimensions (also stored in the $_SESSION).