显示$model->getErrors()

        $r = $user->save();

        $errors=$user->getErrors();
        $msgs='';
        foreach ($errors as $key => $err) {
            foreach ($err as $msg)   {
                $msgs.=$msg;
                Yii::trace($key.":$msg",'user');
            }
        }
        if($msgs){
            Yii::$app->session->setFlash('info',$msgs);
        }