Learn CODEIGNITER with Real Code Examples

Download CodeIgniter package from the official website

Extract files to your web server directory

Set base URL and database configuration in `application/config/config.php`

Load required libraries, helpers, and models

Start building controllers, views, and models

Install PHP 7.4+ and required extensions

Download CodeIgniter 4 or install via Composer

Configure base URL and database connections

Set writable permissions for cache and logs

Start building controllers, models, and views

application/config/config.php - base settings

application/config/database.php - database settings

application/config/routes.php - routing rules

application/config/autoload.php - libraries/helpers autoload

env files for environment-specific settings

php spark serve - run development server (CI4)

php spark migrate - run database migrations

php spark make:controller - generate new controller

php spark make:model - generate new model

php spark test - run unit tests

Language files in `application/Language/`

Support for UTF-8 encoding

Dynamic loading of translation files

Easy addition of new languages

Environment-aware locale settings

Works with screen readers via semantic HTML

Supports multi-language applications

Compatible with modern browsers

Accessible via REST APIs

Integration with front-end accessibility tools

No built-in UI framework; integrates with Bootstrap, Tailwind, etc.

Views can include plain HTML, PHP, or template engines

Reusable partials for headers, footers, and layouts

Supports front-end asset management

AJAX-friendly rendering for dynamic pages

Session handling with cookies or database

Cache management via file or Redis

Configuration stored in config files

Environment-based settings

Flashdata for temporary messages

Models handle CRUD operations

Database migrations for versioned schema

Form input validation

Data caching for performance

REST API responses in JSON