Controller in subdirectory

You need to specify the namespace and the namespace of the extended class or BaseController.

PHP Code:

//routes
$routes->get('/api/(:any)', 'Api\Internal::bounce/$1');

//controller inside Api directory--- App/Controlles/Api/Internal.php
//localhost/projectname/public/api/internal/bounce

namespace App\Controllers;
use App\Controllers\BaseController;

class Internal extends BaseController
{
      public function __construct(){}

      public function bounce(){}
}