CodeIgniter 4 Routing

When to use

• The user wants to attach a before/after filter such as auth or CSRF to specific CodeIgniter routes or groups.
• The user wants to map URLs to controller actions in CodeIgniter 4 by declaring routes in Config/Routes.php.
• The user needs to group CodeIgniter routes under a shared URL prefix, namespace, or filter set.

When NOT to use

• Do not apply this skill to CodeIgniter 3 $route[] array config; CI4 uses a fluent RouteCollection API.
• Do not use this skill to write the controller action body itself; routing only maps a URL to a handler.

Core guidance