CodeIgniter is a powerful PHP framework with a very small footprint, built for developers who need a simple and elegant toolkit to create full-featured web applications.

Feb 1, 2026 · Getting Started Installation Composer Installation Manual Installation Running Your App Worker Mode Troubleshooting Deployment Change Logs Upgrading From a Previous Version …

CodeIgniter 3 is the legacy version of the framework, intended for use with PHP 5.6+. This version is in maintenance, receiving mostly just security updates, and the current version is 3.1.13.

Feb 1, 2026 · We recommend the Composer installation because it keeps CodeIgniter up to date easily. If you would like the simple “download & go” install that CodeIgniter 3 is known for, choose the …

CodeIgniter is a PHP full-stack web framework that is light, fast, flexible and secure. It is an Application Development Framework - a toolkit - for people who build web sites using PHP.

Introduction ¶ CodeIgniter Overview Getting Started CodeIgniter at a Glance Supported Features Application Flow Chart Model-View-Controller Architectural Goals

Feb 1, 2026 · Affected methods are: CodeIgniter\Encryption\EncrypterInterface::encrypt () CodeIgniter\Encryption\EncrypterInterface::decrypt () …

You can serve it through any server of your choice, Apache, nginx, etc, but CodeIgniter comes with a simple command that takes advantage of PHP’s built-in server to get you up and running fast on your …

CodeIgniter comes with full-range of libraries that enable the most commonly needed web development tasks, like accessing a database, sending email, validating form data, maintaining sessions, …

In CodeIgniter, this can be done by setting the ENVIRONMENT constant, which is more fully described on the security page. That’s it! If you’re new to CodeIgniter, please read the Getting Started section …