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php实现购物车

2026-02-27 10:25:01PHP

使用PHP实现购物车功能

数据库设计

创建一个数据库表存储购物车信息，例如：

CREATE TABLE cart (
    id INT AUTO_INCREMENT PRIMARY KEY,
    user_id INT NOT NULL,
    product_id INT NOT NULL,
    quantity INT NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

添加商品到购物车

使用PHP处理表单提交，将商品添加到购物车：

<?php
session_start();
$productId = $_POST['product_id'];
$quantity = $_POST['quantity'];
$userId = $_SESSION['user_id'];

$sql = "INSERT INTO cart (user_id, product_id, quantity) VALUES (?, ?, ?)";
$stmt = $pdo->prepare($sql);
$stmt->execute([$userId, $productId, $quantity]);
?>

显示购物车内容

查询数据库获取当前用户的购物车商品：

php实现购物车

<?php
session_start();
$userId = $_SESSION['user_id'];

$sql = "SELECT p.name, p.price, c.quantity 
        FROM cart c 
        JOIN products p ON c.product_id = p.id 
        WHERE c.user_id = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$userId]);
$cartItems = $stmt->fetchAll();
?>

<ul>
<?php foreach ($cartItems as $item): ?>
    <li><?= $item['name'] ?> - 价格: <?= $item['price'] ?> - 数量: <?= $item['quantity'] ?></li>
<?php endforeach; ?>
</ul>

更新购物车商品数量

处理修改商品数量的请求：

<?php
session_start();
$cartId = $_POST['cart_id'];
$newQuantity = $_POST['quantity'];

$sql = "UPDATE cart SET quantity = ? WHERE id = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$newQuantity, $cartId]);
?>

从购物车移除商品

处理删除商品的请求：

php实现购物车

<?php
session_start();
$cartId = $_POST['cart_id'];

$sql = "DELETE FROM cart WHERE id = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$cartId]);
?>

计算购物车总价

在显示购物车时计算总价格：

<?php
$total = 0;
foreach ($cartItems as $item) {
    $total += $item['price'] * $item['quantity'];
}
?>
<p>总价: <?= $total ?></p>

使用Session实现临时购物车

对于未登录用户，可以使用Session存储购物车数据：

<?php
session_start();

if (!isset($_SESSION['cart'])) {
    $_SESSION['cart'] = [];
}

// 添加商品
$_SESSION['cart'][$productId] = [
    'quantity' => $quantity,
    'name' => $productName,
    'price' => $productPrice
];
?>

清空购物车

提供清空购物车的功能：

<?php
session_start();
$userId = $_SESSION['user_id'];

$sql = "DELETE FROM cart WHERE user_id = ?";
$stmt = $pdo->prepare($sql);
$stmt->execute([$userId]);
?>