An (H)MVC framework
FuelPHP is a MVC (Model-View-Controller) framework that was designed from the ground up to have full support for HMVC as part of its architecture. But we didn't stop there, we also added ViewModels (also known as presentation models) into the mix which give you the option to add a powerfull layer between the Controller and the View. FuelPHP also supports a more router based approach where you might route directly to a closure which deals with the input uri, making the closure the controller and giving it control of further execution.
Almost every class in FuelPHP's core package can be extended without you having to change a single line of code where it's used on extending the core). You can package more functionality into packages that extend or replace the FuelPHP core and you can keep your application modular by dividing it up into application modules. Packages and modules are also a great way to enable re-use of your code.
Security concerns have been front and center from the beginning. Out-of-the-box FuelPHP's Views will encode all your output to make it secure and prevent XSS attacks. If you need to allow HTML through you can mark it as safe or have it cleaned by the default included HTMLawed. FuelPHP also supports CSRF prevention with tokens, input filtering and the Query Builder will assist you in preventing any SQL injection attacks. Several security features inside the framework use functionality offered by PHPSecLib. More about Security in FuelPHP can be read in the documentation.
FuelPHP leverages the power of the command line through a utility called "oil". The utility is designed to help speed up development, increase efficiency and assist testing and debugging while being entirely optional if you are not a fan of the terminal.
FuelPHP includes some base classes to give you a flying start.