PHP trait DTO：高效构建可维护的代码结构

trait LogTrait {
    protected function log($message) {
        // 写日志的逻辑
        echo $message;
    }
}

class User {
    use LogTrait;

    public function getUser($id) {
        // 获取用户信息的逻辑
        $this->log("获取用户信息");
    }
}

class Order {
    use LogTrait;

    public function createOrder($data) {
        // 创建订单的逻辑
        $this->log("创建订单");
    }
}

class UserDTO {
    private $id;
    private $name;
    private $age;
    
    public function __construct($id, $name, $age) {
        $this->id = $id;
        $this->name = $name;
        $this->age = $age;
    }

    // 省略getter和setter方法
}

class UserService {
    public function getUser($id) {
        // 获取用户信息的逻辑
        $userData = // 获取用户数据的逻辑

        // 将用户数据封装成DTO对象
        $userDTO = new UserDTO($userData['id'], $userData['name'], $userData['age']);

        return $userDTO;
    }
}

class UserController {
    private $userService;
    
    public function __construct(UserService $userService) {
        $this->userService = $userService;
    }

    public function showUser($id) {
        // 通过UserService获取UserDTO对象
        $userDTO = $this->userService->getUser($id);

        // 在控制器中处理UserDTO对象
        echo "用户信息：" . $userDTO->getName() . "，年龄：" . $userDTO->getAge();
    }
}