Introduction to CodeIgniter

CodeIgniter Tutorial Series (1/74). Prefer one article? Read the complete CodeIgniter tutorial.

Short description

CodeIgniter is a fast, lightweight PHP framework that follows MVC. This series focuses on CodeIgniter 4 with practical examples for controllers, views, models, validation, databases, APIs, and full projects.

Steps

1. Learn CI4 project structure and routing first.
2. Practice controllers, views, and forms.
3. Add database, models, then APIs and auth.

What you will build toward

MVC basics → forms/validation → MySQL CRUD
Migrations/seeders → REST APIs → JWT auth
Final project: CRUD + Authentication + REST API