Though the debate is quite old yet very young - what PHP framework do you prefer to use and why? choose between Codeigniter, cakePHP, Zend & Symphony

I will prefer following two:

- CodeIgniter for very easy to learn even for a person who didn't work in any other framework or didn't know much about MVC.

- Symfony for fast development, easy and quick admin panel generation and to handle large scale applications.

Both framework have good rating than Zend and cakePHP in terms of performance.