REF: TOP Framework
1 Yii – Yii Framework: Best for Web 2.0 Development
2 CodeIgniter - CodeIgniter: an open source Web Application Framework that helps you write PHP programs.
3 Zend - A bottom-up rewrite of the PHP scripting engine. It features a modular architecture, vastly improved performance, and greater scalability.
4 CakePHP - Official website. Offers a manual for beginners and links towards the last version.
5 Symfony - Easy to use framework to build robust web applications for enterprises.
6 PHPDevShell - PHPDevShell focuses on you getting the job done, providing a highly organized environment and structure.
7 Prado - PRADO is an event-driven and component-based framework for Web application development in PHP 5.
8 Akelos - Port of Ruby on Rails development framework and designed to work for PHP4 and PHP5.
9 QPHP - QPHP is an event-driven(EDP), component-based web framework similar as architecture to ASP.NET.
10 ZooP - An Object Oriented Framework for PHP, Zoop Framework caters to the programmer and includes ajax and validation.