I recommend you to try Codelobster Php edition
(download from:
CodeLobster - Handy Code Tools). It's shareware product.
Has handy interface. There are all standard features for work with code.
Highlighting for paired tags and brackets.
Find & Replace dialog, php and html autocomplete , context and dynamic php, Mysql, HTML help.
It's possible to find declarations for defined functions, classes within the project.
Integrated debugger.
That IDE has several versions (I use the latest) and they constantly improves.