PHP trait DTO：优化数据传输流程的关键工具

class UserDTO
{
    private $id;
    private $username;
    private $email;
    
    public function __construct($id, $username, $email)
    {
        $this->id = $id;
        $this->username = $username;
        $this->email = $email;
    }
    
    public function getId()
    {
        return $this->id;
    }
    
    public function getUsername()
    {
        return $this->username;
    }
    
    public function getEmail()
    {
        return $this->email;
    }
}

trait UserTrait
{
    public function transferData(UserDTO $dto)
    {
        // 根据DTO的属性，传输数据到目标对象
        $this->setId($dto->getId());
        $this->setUsername($dto->getUsername());
        $this->setEmail($dto->getEmail());
    }
}

class UserService
{
    use UserTrait;
    
    public function updateUser(UserDTO $dto)
    {
        // 根据需要更新用户信息
        $this->transferData($dto);
        
        // 其他业务逻辑
        // ...
    }
}

class UserDTO
{
    private $id;
    private $username;
    private $email;
    
    public function __construct($id, $username, $email)
    {
        $this->id = $id;
        $this->username = $username;
        $this->email = $email;
    }
    
    public function getId()
    {
        return $this->id;
    }
    
    public function getUsername()
    {
        return $this->username;
    }
    
    public function getEmail()
    {
        return $this->email;
    }
}

trait UserTrait
{
    public function transferData(UserDTO $dto)
    {
        $this->setId($dto->getId());
        $this->setUsername($dto->getUsername());
        $this->setEmail($dto->getEmail());
    }
}

class UserService
{
    use UserTrait;
    
    private $id;
    private $username;
    private $email;
    
    public function setId($id)
    {
        $this->id = $id;
    }
    
    public function setUsername($username)
    {
        $this->username = $username;
    }
    
    public function setEmail($email)
    {
        $this->email = $email;
    }
    
    public function updateUser(UserDTO $dto)
    {
        $this->transferData($dto);
        
        // 其他业务逻辑
        echo "用户信息更新成功！";
        echo "id：" . $this->id . "，用户名：" . $this->username . "，邮箱：" . $this->email;
    }
}

// 使用示例
$userService = new UserService();
$userDTO = new UserDTO(1, "user1", "user1@example.com");
$userService->updateUser($userDTO);