source/Internal/Module/Setup/Handler/ControllersModuleSettingHandler.php
private function controllerKeysToLowercase(array $controllers) : array
    {
        $result = [];

        foreach ($controllers as $controllerKey => $controllerClass) {
            $result[strtolower($controllerKey)] = $controllerClass;
        }

        return $result;
    }
private function controllerKeysToLowercase(array $controllers) : array
    {
        $result = [];

        foreach ($controllers as $controllerKey => $controllerClass) {
            $result[strtolower($controllerKey)] = $controllerClass;
        }

        return $result;
    }
private function controllerKeysToLowercase ( array $ controllers ) : array { $ result = [ ] ; foreach ( $ controllers as $ controllerKey => $ controllerClass ) { $ result [ strtolower ( $ controllerKey ) ] = $ controllerClass ; } return $ result ; }
Change the controller keys to lower case.

@param array $controllers The controllers array of one module.

@return array The given controllers array with the controller keys in lower case.
Change the controller keys to lower case .