Control site status before menu dispatching.
The hook is called after checking whether the site is offline but before the current router item is retrieved and executed by menu_execute_active_handler(). If the site is in offline mode, $menu_site_status is set to MENU_SITE_OFFLINE.
$menu_site_status: Supported values are MENU_SITE_OFFLINE, MENU_ACCESS_DENIED, MENU_NOT_FOUND and MENU_SITE_ONLINE. Any other value than MENU_SITE_ONLINE will skip the default menu handling system and be passed for delivery to drupal_deliver_page() with a NULL $default_delivery_callback.
$path: Contains the system path that is going to be loaded. This is read only, use hook_url_inbound_alter() to change the path.
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
function hook_menu_site_status_alter(&$menu_site_status, $path) {
// Allow access to my_module/authentication even if site is in offline mode.
if ($menu_site_status == MENU_SITE_OFFLINE && user_is_anonymous() && $path == 'my_module/authentication') {
$menu_site_status = MENU_SITE_ONLINE;
}
}