RE: [PHP] Excel Report Formatting

[snip] It's still not an excel file but an HTML table sent with an Excel mime-type. This is just asking for trouble if the user does not use Excel, as it's exploiting behaviour that looks very particular to Excel and not ALL spreadsheet software. [/snip] This is true, it is exploiting behavior that is particular to Excel. I was able to do this with Open Office too, even though I didn't fully bake the code for that. The article is pretty old and there are other tools that would probably work a lot better, but the OP asked about Excel and coloring.