Redirect von einer view zu einer anderen view - Yii2

Dies ist meine form, in der Ansicht-Seite meiner website.

<?= $form->field($model, 'taskID')->textInput(['readonly' => true, 'value' => Yii::$app->getRequest()->getQueryParam('id')])  ?>   

<?php 
$ifDistributor = User::find()->select('userType')->where(['username'=>Yii::$app->user->identity->username])->andWhere(['userType'=>'Distributer'])->exists();
$ifDistributorHasOnSiteSupport = Distributorinfo::find()->select('hasOnSiteSupport')->where(['UName'=>Yii::$app->user->identity->username])->andWhere(['hasOnSiteSupport'=>1])->exists();
if($ifDistributor)
 if($ifDistributorHasOnSiteSupport)
    echo $form->field($model, 'assignedToID')->dropDownList(
        ArrayHelper::map(dektrium\user\models\User::find()
            ->select('username')
            ->where(['userType'=>'CCE-Distributer'])
            ->andWhere(['distributerID'=>Yii::$app->user->getId()])
            ->all(),'username','username'),['prompt'=>'Select Person']
    );
else {  
                Yii::$app->session->setFlash('error', 
                    "Invalid Page");
                //I WANT TO REDIRECT TO index.php?r=tasks/index THIS URL                    

}                      
?>
<?= $form->field($model, 'remarks') ?>
<?= $form->field($model, 'scheduledTime')->widget(DateTimePicker::classname(), [
                'options' => ['placeholder' => 'Enter event time ...'],
                'pluginOptions' => [
                    'autoclose' => true
                ]
            ])  ?>
<div class="form-group">
    <?= Html::submitButton('Submit', ['class' => 'btn btn-primary']) ?>
</div>

Wie oben dargestellt in den else-Teil, will ich einen redirect zu tasks/index diese url.
Helft mir, wie kann ich tun, dass Sie in diesem Ansicht nur.