On the Code Beach blog there's a recent post comparing a few of the more popular IDEs that you can write your PHP applications in (not all specifically targeted at PHP, of course).

This is a roundup of the available PHP IDEs both free and commercial. You will find a wide range in pricing (free to $400) and options available on Windows, Linux, and Mac OS X including PHPAnywhere which is a web-based IDE.

IDEs in the list include:

• NuSphere PhpED
• PHPEdit
• Dev-PHP
• Komodo Edit
• PHPanywhere