Json如何在yii2中编码? [英] how to Json encode in yii2?

问题描述

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 app\controllers;
    use Yii;
    use yii\filters\AccessControl;
    use yii\web\Controller;
    use yii\filters\VerbFilter;
    use app\models\TblUserRegistration;
    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:如果万一控制器的所有操作都将传递json，则还可以考虑扩展

Solution 1: In case if all your controller's actions will deliver json you may also consider extanding yii\rest\Controller instead of yii\web\Controller :

namespace app\controllers;

use Yii;

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

注意:您也可以使用 ActiveController 扩展了 yii \ rest \ Controller (请参见其余文档).

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

解决方案2::扩展 yii \ web \ Controller 是通过使用 yii \ filters \ ContentNegotiator .请注意，此处$enableCsrfValidation设置为 false 可能是强制性的，因为其

Solution 2: A different approach when extending yii\web\Controller is by using yii\filters\ContentNegotiator. Note that setting $enableCsrfValidation to false may be mandatory here as it is explained in its related docs :

是否启用CSRF(跨站请求伪造)验证. 默认为true.启用CSRF验证后，表单将提交到 Yii Web应用程序必须源自同一应用程序. 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，此功能要求用户客户端接受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 yii \ helpers \ Html :: 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 yii\helpers\Html::beginForm() to generate his hidden input.

上面的代码可以这样重写:

The above code may be rewritten this way :

namespace app\controllers;

use Yii;
use yii\web\Controller;
use yii\filters\ContentNegotiator;
use yii\web\Response;

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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