Is it possible to append content to an .xls file using PHP fwrite()?
fwrite()
When I try this using fwrite(), the resulting file causes an error message in Excel 2007.
Is there a specific separator I can use to accomplish this?
Is it possible without a third party library?
if you just want/need to create a very simple table, you just need to make a *.csv-file which can be opened by excel - but not: you can't use formulas in this and you can't do any kind of formatting.