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There are a lot of ways on the Internet

1. The error of header and buffer result in calling save（“ php://output “Before calling ob_ end_ clean()

2. Delete the break in line 581 of the file

3. Will: $objwriter = – phpexcel_ IOFactory::createWriter($objPHPExcel, ‘Excel5’); Modify to $objwriter = phpexcel_ Writer_ Excel2007($objPHPExcel);

4. Change the export file suffix to. Xlsx

The final solution: change the above method 3excel5 to Excel2007: $objwriter = – phpexcel_ IOFactory::createWriter($objPHPExcel, ‘Excel2007’);