php购物车功能实现

<?php
session_start();

if (empty($_SESSION['cart'])) {
    $_SESSION['cart'] = [];
}
?>

<?php
session_start();

if (isset($_POST['product_id']) && isset($_POST['quantity'])) {
    $productId = $_POST['product_id'];
    $quantity = $_POST['quantity'];

    if (isset($_SESSION['cart'][$productId])) {
        $_SESSION['cart'][$productId]['quantity'] += $quantity;
    } else {
        $_SESSION['cart'][$productId] = [
            'name' => 'Product Name', // 这里需要从数据库或其他地方获取商品名称
            'price' => 10.00, // 这里需要从数据库或其他地方获取商品价格
            'quantity' => $quantity
        ];
    }
}
?>

<?php
session_start();

if (!empty($_SESSION['cart'])) {
    foreach ($_SESSION['cart'] as $productId => $product) {
        echo "Product ID: " . $productId . "<br>";
        echo "Name: " . $product['name'] . "<br>";
        echo "Price: $" . $product['price'] . "<br>";
        echo "Quantity: " . $product['quantity'] . "<br>";
        echo "Total: $" . ($product['price'] * $product['quantity']) . "<br><br>";
    }
} else {
    echo "Your cart is empty.";
}
?>