Get phpBB route with parameter placeholders

route.php

<?php

/**
 * Required services: @config, @path_helper, @router
 *
 * @param string $route_name
 * @return string
 */
public function get_raw_route($route_name)
{
    $app_php = $this->config['enable_mod_rewrite'] ? '' : '/app.' . $this->path_helper->get_php_ext();
    return generate_board_url() . $app_php . $this->router->get_routes()->get($route_name)->getPath();
}