Zend Framework 2.x(zf2) methods to download excel files using PHPExcel

IndexController.php

<?php
namespace App\Controller;

use Zend\Mvc\Controller\AbstractActionController;
class IndexController extends AbstractActionController {
  public function indexAction() {

        $objWriter = \PHPExcel_IOFactory::createWriter($modelService->getExcel()/*returns a PHPExcel object*/, 'Excel2007');
        ob_start();
        $objWriter->save('php://output');
        $excelOutput = ob_get_clean();

        return $this->returnExcel(["status" => 200, 'excelOutput' => $excelOutput], 'otherFileName');
  }
  
  protected function returnExcel(array $data, $filename = 'data') {
        $this->response->getHeaders()->addHeaders(array(
            'Content-Type' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'Content-Disposition' => 'attachment;filename="'. $filename .'xlsx"',
            'Cache-Control' => 'max-age=0',
        ));
        $this->response->setStatusCode($data['status']);

        $this->response->setContent($data['excelOutput']);
        return $this->response;
    }
}