使用 PHP 在 $_SESSION 变量中存储多个值
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Storing multiple values in a $_SESSION variable with PHP
提问by cycero
I'm creating a site which has a shopping cart. I do not need any special functionality so I'm creating the cart on my own rather than integrating any ready one. My products do not have a predefined price in the database. The price is being generated dynamically based on the values entered by a user on the product page. So, the user chooses some specifications, enters the quantity and I get the following values:
我正在创建一个有购物车的网站。我不需要任何特殊功能，所以我自己创建购物车，而不是集成任何现成的。我的产品在数据库中没有预定义的价格。价格是根据用户在产品页面上输入的值动态生成的。所以，用户选择一些规格，输入数量，我得到以下值：
Item ID
Quantity
Total price
商品编号
数量
总价
I need to store those values in the $_SESSION variable and then loop over it when needed to get the results and print them in the shopping cart. The problem is that there are a lot of products and I need to store all those values (Quantity, Total Price) distinctively for the chosen product. That said, how do I store Item ID, Quantity and Total price in the $_SESSION variable and associate those values with each other?
我需要将这些值存储在 $_SESSION 变量中，然后在需要时循环遍历它以获取结果并将它们打印在购物车中。问题是有很多产品，我需要为所选产品分别存储所有这些值（数量、总价）。也就是说，如何在 $_SESSION 变量中存储项目 ID、数量和总价并将这些值相互关联？
Thanks for helping.
谢谢你的帮助。
EDIT: My code implementing Michael's suggestions:
编辑：我的代码实现迈克尔的建议：
$itemid = $db->escape($_POST['productid']);
$itemquantity = $db->escape($_POST['itemquantity']);
$totalprice = $db->escape($_POST['totalprice']);
$_SESSION['items'] = array();
$_SESSION['items'][$itemid] = array('Quantity' => $itemquantity, 'Total' => $totalprice);
var_dump($_SESSION);
回答by Michael Berkowski
Use the item ID as an array key, which holds an array of the other items:
使用项目 ID 作为数组键，其中包含其他项目的数组：
// Initialize the session
session_start();
// Parent array of all items, initialized if not already...
if (!isset($_SESSION['items']) {
$_SESSION['items'] = array();
}
// Add items based on item ID
$_SESSION['items'][$itemID] = array('Quantity' => $quantity, 'Total' => $total);
// Another item...
$_SESSION['items'][$another_itemID] = array('Quantity' => $another_quantity, 'Total' => $another_total);
// etc...
And access them as:
并以以下方式访问它们：
// For item 12345's quantity
echo $_SESSION['items'][12345]['Quantity'];
// Add 1 to quantity for item 54321
$_SESSION['items'][54321]['Quantity']++;
