Système de gestion des commandes du centre commercial implémenté avec PHP

<?php
// 定义订单类
class Order {
    private $orderId;
    private $productId;
    private $productName;
    private $price;
    private $quantity;
    private $totalAmount;

    public function __construct($orderId, $productId, $productName, $price, $quantity) {
        $this->orderId = $orderId;
        $this->productId = $productId;
        $this->productName = $productName;
        $this->price = $price;
        $this->quantity = $quantity;
        $this->totalAmount = $price * $quantity;
    }

    public function getOrderId() {
        return $this->orderId;
    }

    public function getProductId() {
        return $this->productId;
    }

    public function getProductName() {
        return $this->productName;
    }

    public function getPrice() {
        return $this->price;
    }

    public function getQuantity() {
        return $this->quantity;
    }

    public function getTotalAmount() {
        return $this->totalAmount;
    }
}

// 定义订单管理类
class OrderManager {
    private $orders;

    public function __construct() {
        $this->orders = array();
    }

    public function addOrder($orderId, $productId, $productName, $price, $quantity) {
        $order = new Order($orderId, $productId, $productName, $price, $quantity);
        array_push($this->orders, $order);
    }

    public function getOrderById($orderId) {
        foreach ($this->orders as $order) {
            if ($order->getOrderId() == $orderId) {
                return $order;
            }
        }
        return null;
    }

    public function getTotalRevenue() {
        $totalRevenue = 0;
        foreach ($this->orders as $order) {
            $totalRevenue += $order->getTotalAmount();
        }
        return $totalRevenue;
    }
}

// 测试代码
$orderManager = new OrderManager();
$orderManager->addOrder(1, 1001, "商品1", 10.5, 2);
$orderManager->addOrder(2, 1002, "商品2", 5.99, 3);
$orderManager->addOrder(3, 1003, "商品3", 20, 1);

$order = $orderManager->getOrderById(2);
if ($order != null) {
    echo "订单ID：" . $order->getOrderId() . "<br>";
    echo "产品ID：" . $order->getProductId() . "<br>";
    echo "产品名称：" . $order->getProductName() . "<br>";
    echo "单价：" . $order->getPrice() . "<br>";
    echo "数量：" . $order->getQuantity() . "<br>";
    echo "总金额：" . $order->getTotalAmount() . "<br>";
} else {
    echo "未找到相关订单！";
}

$totalRevenue = $orderManager->getTotalRevenue();
echo "总收入：" . $totalRevenue;
?>