CI4

CI4, also known as CodeIgniter 4, is the latest version of the popular PHP framework CodeIgniter. It was released in February 2019, following the release of CodeIgniter 3 in 2015. CI4 is designed to be a fast, lightweight, and secure framework for building web applications. It follows the Model-View-Controller (MVC) architectural pattern, which separates the application logic into three interconnected components: the Model, the View, and the Controller.

One of the key features of CI4 is its use of namespaces, which helps to avoid naming conflicts and makes the code more organized and maintainable. It also introduces a new routing system that allows for more flexible and intuitive URL routing. CI4 also includes a new Query Builder class, which provides a more intuitive and expressive way to interact with databases.

CI4 also includes several security features, such as a new security library that helps to protect against common web application vulnerabilities, and a new encryption library that provides secure encryption and decryption of data. It also includes a new validation library that provides a more flexible and expressive way to validate user input.

CI4 is also designed to be highly extensible, with a modular architecture that allows developers to easily add or remove functionality as needed. It also includes a new service container that provides a more flexible and expressive way to manage dependencies and inject them into classes.

Overall, CI4 is a powerful and flexible framework for building web applications. Its use of namespaces, new routing system, and new Query Builder class make it a more modern and expressive framework than its predecessors. Its security features and modular architecture make it a secure and flexible choice for building web applications.