/**
* Add a child router.
*
* @param string $path Path DSL.
* @param Router $router Child router.
*
* @return void
*/
public function addGroup($path, Router $router)
{
if (in_array([$path, $router], $this->routes, true)) {
return;
}
$this->routes[] = [$path, $router];
$router->registerParent($this->facade);
}