PHPNotepad provides all the useful PHP editing features you need in the small footprint of windows notepad. It adds several features, including syntax highlighting, line numbering, code completion, function hints, tabbed editing, and more. The best part about all these added features is you can enable/disable any features you want! Requires .NET Framework to be installed (The .NET Framework is free as is PHPNotepad!).
New in Version 1.5: Tabbed editing and performance improvements