InfoWorld/DeveloperWorld has posted a list of eight power tools (IDEs) they suggest to any PHP developer looking for something more than just the standard text editors.
In this article, we examine eight IDEs: ActiveState's Komodo IDE, CodeLobster PHP Edition, Eclipse PHP Development Tools (PDT), MPSoftware's phpDesigner, NetBeans IDE for PHP, NuSphere's PhpED, WaterProof's PHPEdit, and Zend Studio. All of these PHP toolkits offer strong support for the other languages and environments (HTML, CSS, JavaScript, SQL database) that a PHP developer encounters. The key differences we discovered were in the tools they provide (HTML inspector, SQL management system) for various tasks, the quality of their documentation, and general ease-of-use.
There's a summary scorecard on the first page of the article if you want to jump straight to the good stuff, but the pages following that will give you much more information about each of the options - the good and the pad points. According to their overall scores, though, Eclipse PDT and Zend Studio tied it up for the highest rankings.