Debian-facile

the main pro of this one is that it's NOT Java based. This keeps the whole thing quick.

Features:

Intelligent Syntax Highlighter - automatic switch between PHP, HTML, CSS, and JavaScript depending on your position!
PHP (both version 4 and 5 are supported)
SQL (MySQL, MSSQL 2000, MSSQL 7, Ingres, Interbase 6, Oracle, Sybase)
HTML/XHTML
CSS (both version 1 and 2.1 are supported)
JavaScript
VBScript
Java
C#
Perl
Python
Ruby
Smarty
PHP:

Support for both PHP 4 and PHP 5
Code Explorer for PHP (includes, classes, extended classes, interfaces, properties, functions, constants and variables)
Code Completion (IntelliSense) for PHP - code assist as you type
Code Tip (code hint) for PHP - code assist as you type
Work with any PHP frameworks (access classes, functions, variables, etc. on the fly)
PHP object oriented programming (OOP) including nested objects
Support for PHP heredoc
Enclose strings with single- or double quotes, linefeed, carriage return or tabs
PHP server variables
PHP statement templates (if, else, then, while…)
Powerful PHP Code Beautifier with many configurations and profile support
phpDocumentor wizard
Add phpDocumentor documentation to functions and classes with one click!
phpDocumentor tags
Comment or uncomment with one click!
Jump to any declaration with filtering by classes, interfaces, functions, variables or constants
Debug (PHP):

Debug with Xdebug
Breakpoints
Step by step debugging
Step into
Step over
Run to cursor
Run until return
Call stack
Watches
Context variables
Evaluate
Profiling
Multiple sessions
Evaluation tip
Catch errors