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php购物车实现代码

2026-02-27 17:14:39PHP

PHP购物车实现代码

购物车功能是电子商务网站的核心部分，以下是一个简单的PHP购物车实现代码示例，包含添加商品、删除商品、更新数量和计算总价等功能。

数据库表结构

创建一个简单的products表和cart表：

php购物车实现代码

CREATE TABLE products (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100),
    price DECIMAL(10, 2),
    description TEXT
);

CREATE TABLE cart (
    id INT AUTO_INCREMENT PRIMARY KEY,
    product_id INT,
    quantity INT,
    session_id VARCHAR(100)
);

添加商品到购物车

<?php
session_start();
if (!isset($_SESSION['cart'])) {
    $_SESSION['cart'] = array();
}

function addToCart($product_id, $quantity = 1) {
    if (isset($_SESSION['cart'][$product_id])) {
        $_SESSION['cart'][$product_id] += $quantity;
    } else {
        $_SESSION['cart'][$product_id] = $quantity;
    }
}
?>

从购物车移除商品

function removeFromCart($product_id) {
    if (isset($_SESSION['cart'][$product_id])) {
        unset($_SESSION['cart'][$product_id]);
    }
}

更新购物车商品数量

function updateCartItem($product_id, $quantity) {
    if (isset($_SESSION['cart'][$product_id])) {
        $_SESSION['cart'][$product_id] = $quantity;
    }
}

计算购物车总价

function calculateTotal() {
    $total = 0;
    $db = new PDO('mysql:host=localhost;dbname=your_db', 'username', 'password');

    foreach ($_SESSION['cart'] as $product_id => $quantity) {
        $stmt = $db->prepare("SELECT price FROM products WHERE id = ?");
        $stmt->execute([$product_id]);
        $product = $stmt->fetch();

        $total += $product['price'] * $quantity;
    }

    return $total;
}

显示购物车内容

function displayCart() {
    $db = new PDO('mysql:host=localhost;dbname=your_db', 'username', 'password');

    echo "<table border='1'>";
    echo "<tr><th>Product</th><th>Price</th><th>Quantity</th><th>Total</th><th>Action</th></tr>";

    foreach ($_SESSION['cart'] as $product_id => $quantity) {
        $stmt = $db->prepare("SELECT name, price FROM products WHERE id = ?");
        $stmt->execute([$product_id]);
        $product = $stmt->fetch();

        $item_total = $product['price'] * $quantity;

        echo "<tr>";
        echo "<td>{$product['name']}</td>";
        echo "<td>\${$product['price']}</td>";
        echo "<td><input type='number' value='{$quantity}' min='1' onchange='updateQuantity({$product_id}, this.value)'></td>";
        echo "<td>\${$item_total}</td>";
        echo "<td><button onclick='removeItem({$product_id})'>Remove</button></td>";
        echo "</tr>";
    }

    echo "</table>";
    echo "<p>Total: \$" . calculateTotal() . "</p>";
}

JavaScript辅助函数

function updateQuantity(product_id, quantity) {
    window.location.href = 'update_cart.php?product_id=' + product_id + '&quantity=' + quantity;
}

function removeItem(product_id) {
    window.location.href = 'remove_from_cart.php?product_id=' + product_id;
}

处理表单的PHP文件

创建add_to_cart.php:

php购物车实现代码

<?php
session_start();
include 'cart_functions.php';

if (isset($_GET['product_id'])) {
    addToCart($_GET['product_id'], $_GET['quantity'] ?? 1);
}

header('Location: products.php');

创建remove_from_cart.php:

<?php
session_start();
include 'cart_functions.php';

if (isset($_GET['product_id'])) {
    removeFromCart($_GET['product_id']);
}

header('Location: cart.php');

创建update_cart.php:

<?php
session_start();
include 'cart_functions.php';

if (isset($_GET['product_id']) && isset($_GET['quantity'])) {
    updateCartItem($_GET['product_id'], $_GET['quantity']);
}

header('Location: cart.php');

这个实现使用了PHP的Session来临时存储购物车数据，并与数据库交互获取商品详细信息。可以根据实际需求扩展功能，如添加用户认证、持久化存储购物车数据等。