What could be the reason for the error in generating an XLSX file through PHPExcel?

Question

PHP

I take an example of creating XLSX from the official PHPExcel documentation,
but I get an error and an empty document as a result

. I work in the webasyst plugin. What could be the problem?
I don't have any problems with excel.

// Create new PHPExcel object
$objPHPExcel = new PHPExcel();
// Set document properties
$objPHPExcel->getProperties()->setCreator("Maarten Balliauw")
               ->setLastModifiedBy("Maarten Balliauw")
               ->setTitle("Office 2007 XLSX Test Document")
               ->setSubject("Office 2007 XLSX Test Document")
               ->setDescription("Test document for Office 2007 XLSX, generated using PHP classes.")
               ->setKeywords("office 2007 openxml php")
               ->setCategory("Test result file");
// Add some data
$objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A1', 'Hello')
            ->setCellValue('B2', 'world!')
            ->setCellValue('C1', 'Hello')
            ->setCellValue('D2', 'world!');
// Miscellaneous glyphs, UTF-8
$objPHPExcel->setActiveSheetIndex(0)
            ->setCellValue('A4', 'Miscellaneous glyphs')
            ->setCellValue('A5', 'éàèùâêîôûëïüÿäöüç');
// Rename worksheet
$objPHPExcel->getActiveSheet()->setTitle('Simple');
// Set active sheet index to the first sheet, so Excel opens this as the first sheet
$objPHPExcel->setActiveSheetIndex(0);
// Redirect output to a client’s web browser (Excel2007)
header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment;filename="01simple.xlsx"');
header('Cache-Control: max-age=0');
// If you're serving to IE 9, then the following may be needed
header('Cache-Control: max-age=1');
// If you're serving to IE over SSL, then the following may be needed
header ('Expires: Mon, 26 Jul 1997 05:00:00 GMT'); // Date in the past
header ('Last-Modified: '.gmdate('D, d M Y H:i:s').' GMT'); // always modified
header ('Cache-Control: cache, must-revalidate'); // HTTP/1.1
header ('Pragma: public'); // HTTP/1.0
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel2007');
$objWriter->save('php://output');
exit;

Answer 1

I propose to check the options:
1. Change the type of generated file from "Excel2007" to other available options.
2. Change the encoding of the php file. If UTF-8 is used, change to CP1251 or vice versa.
3. Try to execute the script with a different version of PHP
4. Try a different version of the PHPExcel library
5. Use an alternative library https://www.phpclasses.org/package/6279-PHP-Parse-...

Answer 2

open it in notepad, it looks like there is an error in the output buffer