php购物车源码

<?php
session_start();

// 添加商品到购物车
function addToCart($productId, $quantity) {
    if (!isset($_SESSION['cart'])) {
        $_SESSION['cart'] = [];
    }
    if (isset($_SESSION['cart'][$productId])) {
        $_SESSION['cart'][$productId] += $quantity;
    } else {
        $_SESSION['cart'][$productId] = $quantity;
    }
}

// 从购物车中删除商品
function removeFromCart($productId) {
    if (isset($_SESSION['cart'][$productId])) {
        unset($_SESSION['cart'][$productId]);
    }
}

// 显示购物车内容
function showCart() {
    if (isset($_SESSION['cart'])) {
        foreach ($_SESSION['cart'] as $productId => $quantity) {
            echo "Product ID: $productId, Quantity: $quantity<br>";
        }
    } else {
        echo "购物车为空";
    }
}

// 示例操作
addToCart(1, 2);
addToCart(2, 1);
showCart();
removeFromCart(1);
showCart();
?>