Is it possible to append content to an .xls file using PHP fwrite()?
When i try this using fwrite(), the resulting file causes an error message in Excel 2007.
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to write you can use : Spreadsheet_Excel_Writer is a tool for creating Excel files without the need for COM components
http://pear.php.net/manual/en/package.fileformats.spreadsheet-excel-writer.php but you cant appaend to file , only to create it.
or using phpexcel (support excel 2007)
http://phpexcel.codeplex.com/
and you can append see a example :
http://phpexcel.codeplex.com/Thread/View.aspx?ThreadId=82996