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184 lines
3.7 KiB
Markdown
184 lines
3.7 KiB
Markdown
# 枚舉類
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當您需要定義錯誤碼和錯誤信息時，可能會使用以下方式，
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```php
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<?php
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class ErrorCode
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{
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const SERVER_ERROR = 500;
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const PARAMS_INVALID = 1000;
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public static $messages = [
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self::SERVER_ERROR => 'Server Error',
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self::PARAMS_INVALID => '參數非法'
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];
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}
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$message = ErrorCode::messages[ErrorCode::SERVER_ERROR] ?? '未知錯誤';
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```
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但這種實現方式並不友好，每當要查詢錯誤碼與對應錯誤信息時，都要在當前 `Class` 中搜索兩次。所以框架提供了基於註解的枚舉類。
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## 安裝
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```
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composer require hyperf/constants
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```
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## 使用
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### 定義枚舉類
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```php
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<?php
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declare(strict_types=1);
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namespace App\Constants;
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use Hyperf\Constants\AbstractConstants;
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use Hyperf\Constants\Annotation\Constants;
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/**
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* @Constants
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*/
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class ErrorCode extends AbstractConstants
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{
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/**
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* @Message("Server Error！")
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*/
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const SERVER_ERROR = 500;
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/**
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* @Message("系統參數錯誤")
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*/
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const SYSTEM_INVALID = 700;
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}
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```
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用户可以使用 `ErrorCode::getMessage(ErrorCode::SERVER_ERROR)` 來獲取對應錯誤信息。
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### 定義異常類
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如果單純使用 `枚舉類`，在異常處理的時候，還是不夠方便。所以我們需要自己定義異常類 `BusinessException`，當有異常進來，會根據錯誤碼主動查詢對應錯誤信息。
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```php
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<?php
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declare(strict_types=1);
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namespace App\Exception;
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use App\Constants\ErrorCode;
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use Hyperf\Server\Exception\ServerException;
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use Throwable;
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class BusinessException extends ServerException
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{
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public function __construct(int $code = 0, string $message = null, Throwable $previous = null)
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{
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if (is_null($message)) {
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$message = ErrorCode::getMessage($code);
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}
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parent::__construct($message, $code, $previous);
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}
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}
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```
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### 拋出異常
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完成上面兩步，就可以在業務邏輯中，拋出對應異常了。
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```php
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<?php
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declare(strict_types=1);
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namespace App\Controller;
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use App\Constants\ErrorCode;
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use App\Exception\BusinessException;
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class IndexController extends Controller
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{
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public function index()
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{
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throw new BusinessException(ErrorCode::SERVER_ERROR);
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}
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}
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```
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### 可變參數
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在使用 `ErrorCode::getMessage(ErrorCode::SERVER_ERROR)` 來獲取對應錯誤信息時，我們也可以傳入可變參數，進行錯誤信息組合。比如以下情況
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```php
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<?php
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use Hyperf\Constants\AbstractConstants;
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use Hyperf\Constants\Annotation\Constants;
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/**
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* @Constants
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*/
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class ErrorCode extends AbstractConstants
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{
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/**
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* @Message("Params %s is invalid.")
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*/
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const PARAMS_INVALID = 1000;
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}
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$message = ErrorCode::getMessage(ErrorCode::PARAMS_INVALID, ['user_id']);
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// 1.2 版本以下 可以使用以下方式，但會在 1.2 版本移除
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$message = ErrorCode::getMessage(ErrorCode::PARAMS_INVALID, 'user_id');
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```
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### 國際化
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> 該功能僅在 v1.1.13 及往後的版本上可用
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要使 [hyperf/constants](https://github.com/hyperf/constants) 組件支持國際化，就必須要安裝 [hyperf/translation](https://github.com/hyperf/translation) 組件並配置好語言文件，如下：
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```
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composer require hyperf/translation
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```
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相關配置詳見 [國際化](./translation.md)
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```php
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<?php
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// 國際化配置
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return [
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'params.invalid' => 'Params :param is invalid.',
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];
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use Hyperf\Constants\AbstractConstants;
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use Hyperf\Constants\Annotation\Constants;
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/**
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* @Constants
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*/
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class ErrorCode extends AbstractConstants
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{
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/**
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* @Message("params.invalid")
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*/
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const PARAMS_INVALID = 1000;
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}
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$message = ErrorCode::getMessage(ErrorCode::SERVER_ERROR, ['param' => 'user_id']);
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```
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