php-codeigniter4-backend

name	php-codeigniter4-backend
description	Use when: implementing PHP backend features in CodeIgniter 4, including controllers, models, validation, routing, and framework conventions.

PHP + CodeIgniter 4 Backend

Goal

Implement robust backend features using CodeIgniter 4 and modern PHP practices.

Do

• Use CI4 MVC structure: controllers for HTTP flow, models for persistence, libraries/services for business logic.
• Keep controllers thin and move reusable logic into service classes.
• Use CI4 validation and request helpers for input handling.
• Use framework config files and environment settings instead of hardcoded values.

Checks

• New routes are explicit and follow existing route grouping conventions.
• Validation errors are handled consistently in UI/API responses.
• Code is compatible with current project PHP and CI4 versions.