phpstack - A TCP/IP Stack and Web Server in PHP

Adam Dunkels writes "Following the trend of writing 'inappropriate' programs in the PHP scripting language, I have written a small TCP/IP stack and a web server entirely in PHP. It is extremely stripped down: the IP stack only implements the most basic functionality required for running the web server and the web server cannot handle pages larger than 1.5k. Nevertheless, the stack is able to support an unlimited number of simultaneous TCP connections and the web server has support for PHP scripting. A live demonstration server is up and running the phpstack software."