A framework is a software solution that helps you program complex things faster, better, and easier. It contains a set of classes that work according to predefined rules, and by using these classes, you don’t have to create a large part of things, but simply use them as a convenience for your project.
Yii is based on components and designed for accelerated application development. It focuses on utilizing code that has already been written, which contributes to a very high processing speed of the application.
CakePHP is created to maximize the speed of application development. In addition to promoting fast application development, CakePHP also allows for easy use and maintenance of existing applications.
FuelPHP is a flexible and intuitive PHP framework. It uses all the tried and tested features and modules from the biggest and most popular frameworks to provide a powerful and easy-to-use tool for creating applications.