如何在yii2中进行Json编码?

2022-01-07 00:00:00 json php yii2

尝试对 json 进行编码并在 yii2 中接收 400: Bad Request.我正在尝试在 Rest 客户端中编码，但无法正常工作.

Attempting to encode json and receive 400: Bad Request in yii2. I am trying to encode in Rest client but it is not working properly.

<?php 
    namespace appcontrollers;
    use Yii;
    use yiifiltersAccessControl;
    use yiiwebController;
    use yiifiltersVerbFilter;
    use appmodelsTblUserRegistration;
    class UserController extends Controller
    {
        public function actionRegister()
        {
            $model = new TblUserRegistration();
            $username = $_POST['username'];
            echo json_encode($username);
        }
    }
?>

错误图片.

错误图片

推荐答案

解决方案 1: 如果您的控制器的所有操作都将传递 json，您也可以考虑扩展 yiiestController 而不是 yiiwebController :

Solution 1: In case if all your controller's actions will deliver json you may also consider extanding yiiestController instead of yiiwebController :

namespace appcontrollers;

use Yii;

class UserController extends yiiestController
{
    public function actionRegister()
    {
        $username = Yii::$app->request->post('username');
        return $username;
    }
}

注意:您也可以使用 ActiveController它扩展了 yiiestController(参见 rest docs) 如果你需要处理 CRUD 操作.

NOTE: you may also use ActiveController which extends yiiestController (see rest docs) if you need to handle CRUD operations.

解决方案 2: 扩展 yiiwebController 是通过使用 yiifilters内容协商器.请注意，此处将 $enableCsrfValidation 设置为 false 可能是强制性的，因为它的 相关文档 :

Solution 2: A different approach when extending yiiwebController is by using yiifiltersContentNegotiator. Note that setting $enableCsrfValidation to false may be mandatory here as it is explained in its related docs :

是否启用 CSRF(跨站点请求伪造)验证.默认为真.当启用 CSRF 验证时，表单提交到Yii Web 应用程序必须源自同一个应用程序.否则，将引发 400 HTTP 异常.

Whether to enable CSRF (Cross-Site Request Forgery) validation. Defaults to true. When CSRF validation is enabled, forms submitted to an Yii Web application must be originated from the same application. If not, a 400 HTTP exception will be raised.

注意，此功能需要用户客户端接受cookie.还，要使用此功能，通过 POST 方法提交的表单必须包含一个名称由 $csrfParam 指定的隐藏输入.您可以使用yiihelpersHtml::beginForm() 生成他的隐藏输入.

Note, this feature requires that the user client accepts cookie. Also, to use this feature, forms submitted via POST method must contain a hidden input whose name is specified by $csrfParam. You may use yiihelpersHtml::beginForm() to generate his hidden input.

上面的代码可以这样改写:

The above code may be rewritten this way :

namespace appcontrollers;

use Yii;
use yiiwebController;
use yiifiltersContentNegotiator;
use yiiwebResponse;

class UserController extends Controller
{
    public $enableCsrfValidation = false;

    public function behaviors()
    {
        return [
            'contentNegotiator' => [
                'class' => ContentNegotiator::className(),
                'formats' => [
                    'application/json' => Response::FORMAT_JSON,
                ],
                'only' => ['register'],
            ],
        ];
    }

    public function actionRegister()
    {
        $username = Yii::$app->request->post('username');
        return $username;
    }
}

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