How do I write, compile and use a user defined function for mysql running on Windows 2003 server?

I am using - MySQL v 5.0.22, PHP v 5.2.0, Windows 2003, Apache.

My skills - Basic PHP knowledge, Basic MySQL.

What is the best way for me to write and use a mysql user defined function in my PHP scripts?

From stackoverflow

• You would need skills in C/C++ (or Delphi would do on Windows).