Notepad++ is a free PHP script editor for Windows computers.
(It also supports various other non-binary script files, like java script, VBS, postscript etc)
Some of its general features include:
- Tabbed document interface
- Drag-and-drop
- Multiple Clipboard (plugin required)
- Split screen editing and synchronized scrolling
- Spell checker (requires Aspell) (Spell checker does not distinguish between text and code)
- Supports text encoding formats such as Unicode, for international writing systems
- Find and replace over multiple documents
- File comparison
- Zooming
Download: http://notepad-plus-plus.org/download