frontend\models\SignupMobileVerifyForm::clearSession PHP Method

    public function clearSession()
    {
        unset($this->_session['mobileSignupTimeout']);
        unset($this->_session['mobileSignup']);
        unset($this->_session['mobileSignupPassword']);
        unset($this->_session['mobileSignupNext']);
        unset($this->_session['mobileSignupVerifyCode']);
    }

 public function actionSignup($step = '1')
 {
     if ($step === '1') {
         $model = new SignupForm();
         if ($model->load(Yii::$app->request->post(), '') && $model->validate()) {
             $model->writeSession();
             if ($sent = $this->_sendMsg($model->mobile)) {
                 Yii::info("用户注册发送短信验证码成功！手机号：{$model->mobile}");
             } else {
                 Yii::warning("用户注册发送短信验证码失败！手机号：{$model->mobile}，说明：" . Yii::$app->smser->message);
             }
             return ['status' => 'success', 'data' => ['isSent' => $sent]];
         } else {
             return ['status' => 'fail', 'data' => ['errors' => $model->getFirstErrors()]];
         }
     } elseif ($step === '2') {
         $session = Yii::$app->session;
         $session->open();
         if (empty($session['mobileSignup']) || empty($session['mobileSignupTimeout']) || $session['mobileSignupTimeout'] < time()) {
             return ['status' => 'fail', 'data' => ['errors' => ['对不起，请您重新注册。']]];
         }
         $model = new SignupMobileVerifyForm();
         if ($model->load(Yii::$app->request->post(), '') && $model->validate()) {
             if ($user = $model->signup()) {
                 $model->clearSession();
                 return ['status' => 'success', 'data' => ['accessToken' => $user->access_token]];
             }
         }
         return ['status' => 'fail', 'data' => ['errors' => $model->getErrors('verifyCode') ?: ['注册失败，请稍后再试。']]];
     } else {
         throw new BadRequestHttpException('参数错误！');
     }
 }