PHPが開発した中古リサイクルサイトがポイント還元機能を提供

class Item {
    private $id;
    private $name;
    private $price;
    
    public function __construct($id, $name, $price) {
        $this->id = $id;
        $this->name = $name;
        $this->price = $price;
    }
    
    // Getter and Setter methods
    
    public function getId() {
        return $this->id;
    }
    
    public function getName() {
        return $this->name;
    }
    
    public function getPrice() {
        return $this->price;
    }
}

class ItemController {
    private $itemModel;
    
    public function __construct() {
        $this->itemModel = new ItemModel();
    }
    
    public function viewItems() {
        $items = $this->itemModel->getAllItems();
        // 调用视图显示物品列表
        $itemView = new ItemView();
        $itemView->showItems($items);
    }
    
    public function buyItem($itemId) {
        $item = $this->itemModel->getById($itemId);
        // 调用视图显示购买页面
        $buyView = new BuyView();
        $buyView->showBuyPage($item);
    }
}

class ItemView {
    public function showItems($items) {
        foreach ($items as $item) {
            echo "物品ID：" . $item->getId() . "<br>";
            echo "物品名称：" . $item->getName() . "<br>";
            echo "物品价格：" . $item->getPrice() . "<br>";
            echo "<a href="buy.php?itemId=" . $item->getId() . "">购买</a><br>";
            echo "<hr>";
        }
    }
}

class User {
    private $id;
    private $name;
    private $points;
    
    public function __construct($id, $name, $points) {
        $this->id = $id;
        $this->name = $name;
        $this->points = $points;
    }
    
    // Getter and Setter methods
    
    public function getId() {
        return $this->id;
    }
    
    public function getName() {
        return $this->name;
    }
    
    public function getPoints() {
        return $this->points;
    }
    
    public function addPoints($points) {
        $this->points += $points;
    }
}

public function exchangeItem($itemId) {
    $user = $this->userModel->getCurrentUser();
    $item = $this->itemModel->getById($itemId);
    
    if ($user->getPoints() >= $item->getPrice()) {
        // 扣除用户积分
        $user->addPoints(-$item->getPrice());
        // 兑换物品
        $this->itemModel->exchange($itemId);
        // 显示兑换成功页面
        $successView = new SuccessView();
        $successView->showSuccessPage($item);
    } else {
        // 显示积分不足页面
        $errorView = new ErrorView();
        $errorView->showErrorPage("积分不足，无法兑换物品。");
    }
}