Here’s something interesting. A programming shell for PHP, which allows you to write your code and test it out without having to save your file and firing up the webbrowser each time you want to run the code.

PHP Interactive is a simple PHP program that lets the user to write code in a text area (actually multiple text areas, with tabs to switch), and see the output of the code just pressing the update button. The scripts are persistent, and the program supports a raw and html output mode, in order to see the raw script output or to interpret it as html.

Link: PHP Interactive - an interactive shell for PHP