InfoWorld has put together a review of some of the top PHP frameworks out there and have shared their results in terms of capability, ease of development, documentation and ease of installation (and overall score, of course).
You can arm yourself with one of the PHP-based Web development frameworks covered in this article. In the following pages, I'll look closely at the Zend Framework, CodeIgniter, CakePHP, and Symfony. I'll also give quick overviews of Qcodo, Lithium, Seagull, and Yii. All are open source frameworks, and all implement to one degree or another the MVC (model view controller) architecture pattern. In addition, all purport to help you build a more scalable and more easily maintainable Web application than you could otherwise create from scratch and, most importantly, do so in less time.
The introduce each of the frameworks at a pretty high level and start with their "Test Center Scorecard" showing their overall ratings of each of the four they tested. They link to a few other articles that talk more about the features of each in-depth and give an "at a glance look" as well. The list shows the minimum PHP version required, licensing, level of documentation currently provided and some of the general pros and cons.