PHP is fully supported in Netbeans since version 6.5. Shortly after Netbeans 6.7 was released, Symfony was the first php framework to be supported in Netbeans. Though it’s still in its early stages, it at least shows that Netbeans developers are serious about bringing popular php frameworks into Netbeans.
I’ve been an avid CakePHP and hoped that it will be supported real soon as well. There are a few hacks on bakery that tells you how to get CakePHP auto code completions feature in Netbeans.
You can also vote for your favorite php framework (zend, prado, smarty, codeigniter etc) here (registration required for vote to count).