Dump Symfony Routes to yaml File

DumpRoutes.php

    /**
     * Dump Routes to YAML File.
     */
    public function dumpRoutes()
    {
        /** @var $router \Symfony\Component\Routing\Router */
        $router = $this->container->get('router');
        $collection = $router->getRouteCollection();
        $allRoutes = $collection->all();
        array_multisort($allRoutes);
        $output = [];
        /** @var @Route $route */
        foreach ($allRoutes as $name => $route) {
            if (substr($name, 0, 1) !== "_") {
                $output[] = "$name:";
                $output[] = "    path: " . $route->getPath();
                $output[] = "    controller: " . $route->getDefault('_controller');
                $output[] = "";
            }
        }
        file_put_contents('output.yaml', implode("\n", $output));
        return new Response('done');
    }