yii2中添加验证码的实现方法

public function rules(){return ['verifyCode', 'captcha'],}

public function atrributeLabels(){return ['verifyCode'=>'Verification Code', ];}

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