WebDeveloperJuice.com has posted a list of several PHP tools that you can use to create Microsfot Excel reports from your data (some a bit more feature-packed than others).

Every time somebody does something unique with PHP that is far beyond the standards and norms of PHP applications. One must say you will truly be overwhelmed by the capabilities and features of PHP language. Microsoft Excel is widely used by most of the companies as a report generation tool and data analysis tool. [...] In this post we will have a look at the various Libraries that the PHP developers can use for generating Excel Reports in any PHP Application and for exporting the data to Microsoft Excel Spreadsheets.

The tools that made their list are:

• PHP Export Data
• PHP Excel Library
• Excel Writer (XML) PHP Library
• Php-Excel
• Pear Excel Writer Library