Excel

I was looking for a way to build a spreadsheet (Excel) dynamically with data from a table, and I was curious about doing it in PHP .. I prefer to use PHP, but I know in ASP it can be done. If I'm running PHP on Linux (can't use the COM functions), is there a way this can be done? Preferably starting with something like header("application/ms-excel...") or whatever the mime is - dunno off the top of my head, and just writing data? If there's no way to do this directly is it possible that by starting with this header and then sending a csv (comma separated) text page that excel will read it as a spreadsheet? Any help would be appreciated.. -Ron - ron_pa@hotmail.com