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http://cakephp.org/

CakePHP : the rapid development php framework CakePHP enables PHP users at all levels to rapidly develop robust web applications. ..

http://php.net/

PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section. ..

http://www.symfony-project.org/

Symfony is a full-stack framework, a library of cohesive classes written in PHP. It provides an architecture, components and tools for developers to build complex web applications faster. Choosing symfony allows you to release your applications earlier, host and scale them without problem, and maintain them over time with no surprise. Symfony is based on experience. It does not reinvent the wheel: it uses most of the best practices of web development and integrates some great third-party libraries. ..

http://www.smarty.net/

One of the best tempalting system for PHP. Now featuring PHP5 SOON!..