Journal: PHP Framework

I'm wondering if there is good framework for PHP like Struts for Java. From what I've seen so far, it looks like there are a bunch of different ones, but I'd like to know which ones are the most widely used. I've been using Struts and I really like it. However, I'm taking on a project where I have to use PHP and would like to use a framework that has a good community and that I can rely on to be around for several years.