What should I do if the yii verification code does not display pictures?

#yii What should I do if the verification code does not display the picture?

Use of verification code in yii2 - the picture is not displayed

Recommended learning: yii framework

1. In the controller

public function actions()
    {
        return [
            'captcha' => [
                'class' => 'yii\captcha\CaptchaAction',
                'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,
            ],
        ];
    }

2. There must be a verification code field in the model $verifyCode

3. In the view,

use yii\helpers\Html;
use yii\widgets\ActiveForm;
use yii\captcha\Captcha;

automatically generates a form

Verification code code in the page

<?= $form->field($model, &#39;verifyCode&#39;)->widget(Captcha::className(), [
                    &#39;template&#39; => &#39;<div class="row"><div class="col-lg-3">{image}</div><div class="col-lg-6">{input}</div></div>&#39;,
]) ?>

Permissions in the controller may cause the verification code image not to be displayed,

public function behaviors()

{

                                                                                                                                                                                                                                                       'access' => 'only' => ['logout', 'signup','login'],

                'rules' => Actions' = & gt; ['signup'],

# 'all' = & gt; true,

'roles' = & gt; ['? '],

##] , [

'Actions' = & GT; ['Logout'],

'Alow' = & GT; TRUE,

## 'ROLES' = > ['@'],

                                                                                                                                                                                                                        #                                                                                                                                                                                                                                                                                                          #                                                                                                                                                                                                                                                                                                        .

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