"We have been using the frameworks for the high end website application development projects for our clients. We have expertise on CakePHP, Code Igniter, Yii Framework etc.
These frameworks are free and open source in nature which helps the developer to use the same without any hassle. The flexibility completely differs among each of the framework.
Most of the frameworks include Modern View Controller software with them and this enables you to build the web applications with separate layers, and the advantage in this is, each and every layer can be built quickly with respect to its needs and uses for that application (with respective experts). Moreover the system would be less complicated.