使用PHP trait DTO實現高度可自訂的資料傳輸框架

/**
 * 基本的DTO类
 */
abstract class BaseDTO
{
    /**
     * 属性赋值
     */
    public function assign(array $data)
    {
        foreach ($data as $key => $value) {
            if (property_exists($this, $key)) {
                $this->{$key} = $value;
            }
        }
    }

    /**
     * 属性读取
     */
    public function get($property)
    {
        if (property_exists($this, $property)) {
            return $this->{$property};
        }
        return null;
    }

    /**
     * 属性校验
     */
    public function has($property)
    {
        return property_exists($this, $property);
    }
}

/**
 * 示例子类
 */
class UserDTO extends BaseDTO
{
    /**
     * 属性定义
     */
    public $id;
    public $name;
    public $email;

    /**
     * 自定义方法
     */
    public function isEmailValid()
    {
        return filter_var($this->email, FILTER_VALIDATE_EMAIL);
    }
}

// 创建DTO对象
$userDTO = new UserDTO();

// 属性赋值
$userDTO->assign([
    'id' => 1,
    'name' => '张三',
    'email' => 'zhangsan@example.com'
]);

// 属性读取
$userName = $userDTO->get('name');
$emailValid = $userDTO->isEmailValid();