Should "Index" be avoided as a controller name in CodeIgniter?

Call your default controller by another name, aside from “Index” in order to avoid conflicts with built-in routers. For instance, you may call it ”Home” or any other appropriate name.

In order to keep “Index” as a name of your controller ensure to state custom routes in the “config/routes.php” in regards to request route to your Index controller. This will help in defining particular routing rules for various URLs.

Here's an example of how you can define a custom route in "config/routes.php" to handle "index/blah" and "index/index" differently:

Code:

$route['index/blah'] = 'Index/blah';
$route['index/index'] = 'Index/index';