JasonLewis\EnhancedRouter\Router::mergeRouteGroups PHP Method

    protected function mergeRouteGroups()
    {
        $routes = $this->routes->all();
        foreach ($this->routeGroups as $key => $group) {
            // Spin through every route and merge the group filters onto the route.
            foreach ($group->getRoutes() as $route) {
                // If the group is nested within other groups we need to spin over those
                // groups and merge in those filters as well. This allows a filter
                // applied to an outer group be used on all routes within that
                // group, even if they are within other groups.
                if ($group->getGroupDepth() > 0) {
                    for ($i = count($this->routeGroups) - $group->getGroupDepth(); $i < count($this->routeGroups); ++$i) {
                        $this->mergeGroupFilters($route, $this->routeGroups[$i]);
                    }
                }
                // After any outer group filters have been applied we can merge the
                // filters from the immediate parent group of the route. This is
                // so that outer group filters are run first, since they are
                // technically the first filters that are applied.
                $this->mergeGroupFilters($route, $group);
            }
            $routes = array_merge($routes, $group->getRoutes());
        }
        $this->routes = new RouteCollection();
        foreach ($routes as $name => $route) {
            $this->routes->add($name, $route);
        }
        $this->routeGroups = array();
    }