Is there a PHP web toolkit similar to Google Web Toolkit?

I've been playing with GWT lately, and I like the idea a lot. The only downside for me is Java, which I'm not a big fan of. (Please don't argue about Java being better than PHP, it's not the point here, really) Do you know about any mature and efficient PHP toolkit providing a set of widgets just like GWT does ? Thanks for your help :) Edit : To rephrase it, I'm looking for a PHP framework that can generate most of the HTML code for the pages of my applications. PHP-Ext seems to be a pretty good example of what I'm looking for. Do you know about any other project of that kind ? Nicolas