YII2 rules validation rule, Ajax verifies that the mobile phone number is unique

<?phpnamespace frontend\models; UseYii; UseYii\base\model;/** * Signup form*/classSignupformextendsmodel{ Public $mobile;  Public $captcha;  Public $password; /** * @inheritdoc*/     Public functionrules () {return [            [[' Mobile ', ' captcha ', ' Password '], ' trim ',            [[' Mobile ', ' captcha ', ' Password '], ' required ',            [[' Mobile ', ' match ', ' pattern ' = '/^1[3|4|5|7|8][0-9]{9}$/'],            [[' Mobile ', ' unique ', ' targetclass ' = ' \common\models\user ', ' message ' = ' The mobile number has been registered! ‘],                        [[' Password ', ' match ', ' pattern ' = '/^\s+$/'],            [[' Password '], ' string ', ' length ' = [6, 32]],                        [[' Captcha '], ' captcha ',        ]; }        /** * @inheritdoc*/     Public functionAttributelabels () {return [            ' Mobile ' + ' phone number ', ' captcha ' = ' Verification code ', ' Password ' + ' password '        ]; }         Public functionwritesession () {$session= Yii::$app-session; $session-open (); $session[' mobilesignuptimeout '] = Time() + 600; $session[' mobilesignup '] =$this-Mobile; $session[' mobilesignuppassword '] =$this-password; }}

usercontroller.php

        if($step!== ' 2 ') {            $model=NewSignupform (); $model->load (Yii::$app->request->post ()); if(Yii::$app->request->Isajax) {Yii::$app->response->format = Response::Format_json; returnActiveform::validate ($model); }                        if(Yii::$app->request->ispost &&$model-Validate ()) {                $model-writesession (); if($this->_sendmsg ($model-mobile)) {Yii:: info ("User registered to send SMS verification code successfully! Phone Number: {$model->mobile} "); Yii::$app->session->setflash (' sentsuccess '); } Else{Yii:: Warning ("User registration to send SMS verification code failed!") Phone Number: {$model->mobile}, Description: ". YII::$app->smser->message); Yii::$app->session->setflash (' failedtosend ', ' verification code failed to send, please try again! ‘); }                return $this->redirect ([' Signup ', ' step ' = ' 2 ')]); }

signup.php

        if($step!== ' 2 ') {            $model=NewSignupform (); $model->load (Yii::$app->request->post ()); if(Yii::$app->request->Isajax) {Yii::$app->response->format = Response::Format_json; returnActiveform::validate ($model); }                        if(Yii::$app->request->ispost &&$model-Validate ()) {                $model-writesession (); if($this->_sendmsg ($model-mobile)) {Yii:: info ("User registered to send SMS verification code successfully! Phone Number: {$model->mobile} "); Yii::$app->session->setflash (' sentsuccess '); } Else{Yii:: Warning ("User registration to send SMS verification code failed!") Phone Number: {$model->mobile}, Description: ". YII::$app->smser->message); Yii::$app->session->setflash (' failedtosend ', ' verification code failed to send, please try again! ‘); }                return $this->redirect ([' Signup ', ' step ' = ' 2 ')]); }

YII2 rules validation rule, Ajax verifies that the mobile phone number is unique