php - 循环遍历二维 session 数组购物车php

Question

我正在构建一个购物车，想要使用二维数组来存储商品 ID 和数量。当用户进入购物车时，我希望能够从数组中获取商品 ID 并从数据库中输出商品详细信息

/**************** Adding to the 2d array ***********************/
    //Check to see if variable isset and then add item to shopping cart
    //$itemID is the ID of the product
    //$quantity is the quantity of the product they wish to order
    if(isset($_GET['add'])){
        $itemID = $_GET['add'];
        $quantity = $_POST['quantity'];
        $_SESSION['cart'][] = array("id" => $itemID,"quantity" => $quantity);
        header('xxx');//stops user contsanlty adding on refresh
    }

    /******************** Looping through the array  **********************/
        //need to loop through grab the item ID
        //then pull what we need from the database  

        //This is where I want to grab the id from the array and query the database

        $cart = $_SESSION['cart'];
        foreach ($cart as $value ){
        //works like it should
            foreach ( $value as $key=> $final_val ){
                echo $key;
                echo ':';
                echo $final_val;
                echo '<br/>';
            }
                echo '<br/>';
        }

数组输出如下

id:1数量:5

ID:2数量:1

我在弄清楚如何分离 ID 和数量以便我可以使用商品 ID 查询数据库时遇到了一些麻烦。

Answer 1

foreach ( $value as $key=> $final_val ){
              if($key=='id')
              {
                echo $key;
                echo ':';
                echo $final_val;
                echo '<br/>';
              }
            }

或者你可以直接使用像$value['id']像这样的事情会对你有帮助......请尝试。这是你需要的吗？