PHP trait DTO：提高数据传输效率的关键技术

trait UserDTO
{
    protected $id;
    protected $username;
    protected $email;

    public function setId($id)
    {
        $this->id = $id;
    }

    public function getId()
    {
        return $this->id;
    }

    public function setUsername($username)
    {
        $this->username = $username;
    }

    public function getUsername()
    {
        return $this->username;
    }

    public function setEmail($email)
    {
        $this->email = $email;
    }

    public function getEmail()
    {
        return $this->email;
    }
}

class UserController
{
    use UserDTO;

    public function getUser(int $id)
    {
        // 模拟从数据库获取用户数据
        $userData = [
            'id' => $id,
            'username' => 'John Doe',
            'email' => 'john.doe@example.com',
        ];

        // 创建DTO对象并设置属性值
        $user = new User();
        $user->setId($userData['id']);
        $user->setUsername($userData['username']);
        $user->setEmail($userData['email']);

        return $user;
    }
}

// 调用示例
$userController = new UserController();
$user = $userController->getUser(1);

echo "ID: " . $user->getId() . "<br>";
echo "Username: " . $user->getUsername() . "<br>";
echo "Email: " . $user->getEmail() . "<br>";