What could be causing Excel to display an error message about unreadable content when opening a file generated by PHP, and how can this issue be diagnosed?

The issue of Excel displaying an error message about unreadable content when opening a file generated by PHP could be caused by incorrect encoding or formatting of the Excel file. To diagnose and fix this issue, you can try specifying the correct content type and encoding when generating the Excel file using PHP. 

header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
header('Content-Disposition: attachment; filename="example.xlsx"');
header('Cache-Control: max-age=0');

// Generate Excel file content here
// Make sure to use correct encoding and formatting

Keywords

Excel unreadable content file generation PHP diagnosis

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