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$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, "Xlsx");
$writer->save("05featuredemo.xlsx");
$tempfile=tempnam(sys_get_temp_dir(),'');
$writer = \PhpOffice\PhpSpreadsheet\IOFactory::createWriter($spreadsheet, "Xlsx");
$writer->save($tempfile);
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