Example of Yii2 framework to realize login and add verification code function

In this paper, the Yii2 framework is used to realize the function of adding verification code when logging in. Share it for your reference, as follows:

In models

LoginForm.php

public $verifyCode;
public function rules()
{
   return [
       ... 
      ['verifyCode', 'captcha', 'on' => 'login'], // Verification code 
   ];
}
public function scenarios() {
    $scenarios = parent::scenarios();
    $scenarios['login'] = ['username', 'password', 'rememberMe', 'verifyCode'];
    return $scenarios;
}

In controller

public function actions()
{
    return [
      'error' => [
        'class' => 'yii\web\ErrorAction',
      ],
      'captcha' => [
        'class' => 'yii\captcha\CaptchaAction',
        'fixedVerifyCode' => YII_ENV_TEST ? 'testme' : null,
        'width' => 100,
        'height' => 34,
        'padding' => 0,
        'minLength' => 4,
        'maxLength' => 4,
      ],
    ];
}
public function actionLogin()
{
    if (!\Yii::$app->user->isGuest) {
      return $this->goHome();
    }
    $model = new LoginForm(['scenario' => 'login']);
    if ($model->load(Yii::$app->request->post()) && $model->login()) {
      return $this->goBack();
    } else {
      return $this->render('login', [
        'model' => $model,
      ]);
    }
}

In view

<?php
use yii\helpers\Html;
use yii\bootstrap\ActiveForm;
use yii\captcha\Captcha;
?>
<?php $form = ActiveForm::begin(['id' => 'login-form']); ?>
<?= $form->field($model, 'verifyCode')->widget(Captcha::className(), [
          'template' => '<div class="input-group input-group-lg col-md-8"><span class="input-group-addon"><i class="glyphicon glyphicon-eye-open red"></i></span>{input}<div class="input-group-addon" style="padding:5px;">{image}</div></div>',
          'options' => ['class' => 'form-control','placeholder'=>" Verification code "],
          'imageOptions'=>['alt'=>' Click to change the picture ','title'=>' Click to change the picture ', 'style'=>'cursor:pointer']
 ])->label(false) ?>
<?php ActiveForm::end(); ?>

More readers interested in Yii can check the topics of this site: "Introduction to Yii Framework and Summary of Common Skills", "Summary of Excellent Development Framework of php", "Basic Tutorial of Introduction to smarty Template", "Introduction to php Object-Oriented Programming", "Summary of Usage of php String (string)", "Introduction to php+mysql Database Operation" and "Summary of Common Database Operation Skills of php"

I hope this article is helpful to the PHP programming based on Yii framework.