src/actions/DeleteAction.php
public function run($id)
    {
        $model = $this->controller->findModel($id);
        if ($model->is_system) {
            \Yii::$app->session->setFlash('warning', \Yii::t('app', 'You cannot update or delete system handlers'));
        } else {
            $model->delete();
        }
        return $this->controller->redirect(['index']);
    }
public function run($id)
    {
        $model = $this->controller->findModel($id);
        if ($model->is_system) {
            \Yii::$app->session->setFlash('warning', \Yii::t('app', 'You cannot update or delete system handlers'));
        } else {
            $model->delete();
        }
        return $this->controller->redirect(['index']);
    }
Deletes an existing EventEventHandler model.
If deletion is successful, the browser will be redirected to the 'index' page.
@param integer $id
@return mixed