In an interesting note from the DotGeek PHP5 programming tournament, there has been a submission of an OpenGL implementation in PHP has been released by Peter 'iridium' Waller.

This snippet shows four items being rendered in realtime by PHP at a not unreasonable 59FPS. The author welcomes feedback with practical uses for this technology. There were also loads of discussions that followed (Slashdot).

For an example image, see here, and to go grab the package to play with it yourself - you can download it here. Please note: this script runs only on Win32 and is intended to run as an application not a web app.