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

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,      ]);    }}

<?phpuse 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'=>"驗證碼"],          'imageOptions'=>['alt'=>'點擊換圖','title'=>'點擊換圖', 'style'=>'cursor:pointer'] ])->label(false) ?><?php ActiveForm::end(); ?>