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  1. Welcome to CodeIgniter

    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.

  2. Welcome to CodeIgniter

    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.

  3. Installation — CodeIgniter 4.6.4 documentation

    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 manual installation.

  4. Build Your First Application — CodeIgniter 4.6.4 documentation

    Dec 12, 2025 · 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 …

  5. Welcome to CodeIgniter4 — CodeIgniter 4.6.4 documentation

    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.

  6. CodeIgniter4 User Guide — CodeIgniter 4.6.4 documentation

    Dec 12, 2025 · Getting Started Installation Composer Installation Manual Installation Running Your App Troubleshooting Deployment Change Logs Upgrading From a Previous Version CodeIgniter …

  7. CodeIgniter User Guide — CodeIgniter 3.1.13 documentation

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

  8. Installation Instructions — CodeIgniter 3.1.13 documentation

    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 …

  9. CodeIgniter Forums

    Jan 12, 2026 · 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.

  10. Welcome to CodeIgniter — CodeIgniter 3.1.13 documentation

    CodeIgniter is an Application Development Framework - a toolkit - for people who build web sites using PHP.