Useful Resources
These resources are the best places to continue after this course. Always check the version selector in the documentation so the examples match the framework release you use.
Official documentation
- CodeIgniter User Guide — installation, concepts, libraries, and API details.
- Upgrade notes — changes between 4.x releases.
- CodeIgniter website — news and release announcements.
Source code and issues
- CodeIgniter 4 on GitHub — framework source and issue tracker.
- App Starter — the project template used in the installation topic.
Community
- CodeIgniter Forum — questions, patterns, and troubleshooting.
- Packagist — Composer packages you can add to a project.
Background reading
- PHP manual — language reference and function signatures.
- OWASP Cheat Sheet Series — practical security guidance.
When you follow a tutorial, note its CodeIgniter version. A CodeIgniter 3 example may use a different folder layout and helper names than CodeIgniter 4.
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