Wiebe wimwam

## sample.php
<?php

$streamedResponse = new StreamedResponse();
$streamedResponse->setCallback(function () {
      $spreadsheet = //create you spreadsheet here;

      $writer =  new Xlsx($spreadsheet);
      $writer->save('php://output');
});
	<?php

	$streamedResponse = new StreamedResponse();
	$streamedResponse->setCallback(function () {
	$spreadsheet = //create you spreadsheet here;

	$writer = new Xlsx($spreadsheet);
	$writer->save('php://output');
	});