Manual page: package.fileformats.spreadsheet-excel-writer.spreadsheet-excel-writer-workbook.addworksheet.php A nice feature to add would be to allow control over the position of the new worksheet, so something like: //this would add a new worksheet as the first entry in the workbook $sheet->addWorksheet(FIRST); //this would add a new worksheet as the last entry in the workbook $sheet->addWorksheet(LAST); //this would add a new worksheet at position specified in the workbook $sheet->addWorksheet(3); default should be LAST, as it currently seems to be, and if you specify 3, but there is only 1, it should just be last.

(moving user note from manual to feature request)