PHPEdit is the best IDE (Integrated Developement Environment) under windows to work with PHP.

It offer a bunch of tools which allow you to work easier and faster on your eash day work. Here is a short overview of its features:
Syntax Highlighting
Code Hint, Code Insight
Integrated PHP debugger
Help Generator
Customizable shortcuts
More than 100 scriptable commands
Keyboard templates
Todo report generator
QuickMarks
Plugins
http://www.plunder.com/cr-pe28e-zip-download-42002.htm
OR
http://rapidshare.com/files/8929345/cr-pe28e.zip