code: public function actionDelete($id)
      {        
  		$model = $this->findModel($id);        
          $model->isdel = 1;
          $model->save();
          //$model->delete(); //this will true delete
          
          return $this->redirect(['index']);
      }
docs: Deletes an existing StaticPage model.
  If deletion is successful, the browser will be redirected to the 'index' page.
  @param integer $id
  @return mixed