Custom Module Development in Joomla 5/6

1. Fundamental Concepts

Modules in Joomla 5/6 follow a modern architecture based on:

• PSR-4: Automatic class autoloading
• Dependency Injection (DI): Centralized service management
• Namespaces: Clear code organization
• XML Configuration: Declarative parameters and configuration

A module is an extension that renders in specific site positions (sidebar, header, etc.). Different from components (main sections) and plugins (system hooks).

2. Modern File Structure