Yii2 redirecting to previous page after login

<div class="panel-body arab">
                **<?php $referer = \Yii::$app->request->referrer;?>**
                <?php $form = ActiveForm::begin([
                    'id' => 'login-form',
                    'enableAjaxValidation' => true,
                    'enableClientValidation' => false,
                    'validateOnBlur' => false,
                    'validateOnType' => false,
                    'validateOnChange' => false,
                ]) ?>
                **<?= $form->field($model, 'referer')->hiddenInput(['value' => $referer])->label(false) ?>**
                <?php if ($module->debug): ?>
                    <?= $form->field($model, 'login', [
                        'inputOptions' => [
                            'autofocus' => 'autofocus',
                            'class' => 'form-control',
                            'tabindex' => '1']])->dropDownList(LoginForm::loginList());
                    ?>

                <?php else: ?>

                    <?= $form->field($model, 'login',
                        ['inputOptions' => ['autofocus' => 'autofocus', 'class' => 'form-control', 'tabindex' => '1']]
                    );
                    ?>

                <?php endif ?>

                <?php if ($module->debug): ?>
                    <div class="alert alert-warning">
                        <?= Yii::t('user', 'Password is not necessary because the module is in DEBUG mode.'); ?>
                    </div>
                <?php else: ?>
                    <?= $form->field(
                        $model,
                        'password',
                        ['inputOptions' => ['class' => 'form-control', 'tabindex' => '2']])
                        ->passwordInput()
                        ->label(
                            Yii::t('user', 'Password')
                            . ($module->enablePasswordRecovery ?
                                ' (' . Html::a(
                                    Yii::t('user', 'Forgot password?'),
                                    ['/user/recovery/request'],
                                    ['tabindex' => '5']
                                )
                                . ')' : '')
                        ) ?>
                <?php endif ?>

                <?= $form->field($model, 'rememberMe')->checkbox(['tabindex' => '3']) ?>

                <?= Html::submitButton(
                    Yii::t('user', 'Sign in'),
                    ['class' => 'btn btn-success btn-block', 'tabindex' => '4']
                ) ?>

                <?php ActiveForm::end(); ?>
                

public function getReferer()
    {
        $getLink = \Yii::$app->request->post('login-form')['referer'];
        if(preg_match('/tajrobtak/', $getLink)){
        return $getLink;
        } else {
        return "";
        }
    }

 public function actionLogin()
    {
        if (!\Yii::$app->user->isGuest) {
            $this->goHome();
        }

        /** @var LoginForm $model */
        $model = \Yii::createObject(LoginForm::className());
        $referery = $model->getReferer();
        $event = $this->getFormEvent($model);

        $this->performAjaxValidation($model);

        $this->trigger(self::EVENT_BEFORE_LOGIN, $event);

        if ($model->load(\Yii::$app->getRequest()->post()) && $model->login()) {
            $this->trigger(self::EVENT_AFTER_LOGIN, $event);
            $this->redirect(Url::to($referery,true));
        }

        return $this->render('login', [
            'model'  => $model,
            'module' => $this->module,
        ]);
    }

<?php $form = ActiveForm::begin(['id' => 'login-form']); ?>
<?= $form->field($model, 'referer')->hiddenInput()->label(false) ?>

$form = new LoginForm();
//get previos viewed page url and store in the new model
$form->referer = Yii::$app->request->referrer;
if ($form->load(Yii::$app->request->post())) {
   if($form->login()){
      return $this->goBack((($form->referer) ? $form->referer : null));
   }
}

public $referer;
/**
     * {@inheritdoc}
     */
    public function rules()
    {
        return [
            //...
            ['referer', 'string'],
        ];
    }

...
'modules' => [
        'user' => [
            'class' => \dektrium\user\Module::className(),
            'admins' => ['adminname'],
            'enableConfirmation' => false,
            'modelMap' => [
                'User' => 'app\models\User',
                'UserSearch' => 'app\models\UserSearch',
                'Profile' => 'app\models\Profile',
            ],
            'controllerMap' => [
                'profile' => 'app\controllers\user\ProfileController',
                'security' => [
                    'class' => \dektrium\user\controllers\SecurityController::className(),
                    'on ' . \dektrium\user\controllers\SecurityController::EVENT_AFTER_LOGIN => function ($e) {
                        /*if (Yii::$app->user->can('student free')) {
                            Yii::$app->response->redirect(array('/course'))->send();
                        }
                        if (Yii::$app->user->can('admin')) {
                            Yii::$app->response->redirect('http://site.ru/user/')->send();
                        }*/

                        //Yii::$app->response->redirect(Yii::$app->request->referrer)->send();
                    //    Yii::$app->response->redirect(array('/user/'.Yii::$app->user->id))->send();
                        //Yii::$app->end();
                    }
                ],
            ],
        ],
...