controllers/AdminController.php
public function actionCreate()
    {
        /** @var User $user */
        $user = \Yii::createObject([
            'class'    => User::className(),
            'scenario' => 'create',
        ]);

        $this->performAjaxValidation($user);

        if ($user->load(\Yii::$app->request->post()) && $user->create()) {
            \Yii::$app->getSession()->setFlash('success', \Yii::t('user', 'User has been created'));
            return $this->redirect(['index']);
        }

        return $this->render('create', [
            'user' => $user
        ]);
    }
public function actionCreate()
    {
        /** @var User $user */
        $user = \Yii::createObject([
            'class'    => User::className(),
            'scenario' => 'create',
        ]);

        $this->performAjaxValidation($user);

        if ($user->load(\Yii::$app->request->post()) && $user->create()) {
            \Yii::$app->getSession()->setFlash('success', \Yii::t('user', 'User has been created'));
            return $this->redirect(['index']);
        }

        return $this->render('create', [
            'user' => $user
        ]);
    }
Creates a new User model.
If creation is successful, the browser will be redirected to the 'index' page.
@return mixed