This is a standalone PHP extension for accessing SPI on Linux systems. I have no idea if this will build or work on Windows as I have developed it for my Raspberry Pi
Github user Frak is doing some interesting stuff combining low level Raspberry Pi interfacing with PHP – perhaps for web-server-based Light painting?
Each Friday is PiDay here at Adafruit, be sure to check out our posts, tutorials and new Raspberry Pi related products. Have you tried the new “Adafruit Raspberry Pi Educational Linux Distro” ? It’s our tweaked distribution for teaching electronics using the Raspberry Pi.