codeigniter-knowledge
CodeIgniter Knowledge Base
Quick reference for CodeIgniter 4 framework patterns and PHP implementation guidelines. CodeIgniter 4 is a complete rewrite of the framework, built for PHP 8.1+ with namespaces, autoloading, and a modern MVC architecture. It remains lightweight and fast while providing the tools needed for professional application development.
Core Principles
MVC Architecture
Request → index.php → Bootstrap → Routing
→ Filters (before) → Controller → Service/Model → View
→ Filters (after) → Response
Key principles:
- Lightweight core with minimal overhead
- HMVC-capable via modules (app/Modules/)
- Services container for dependency management
- Filters as middleware equivalent
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