static function update($newPages)
{
$pages = pages::get(true);
pages::sanity_check($pages, $newPages);
$pages = $pages['pages'];
$navPages = pages::nav_pages($newPages);
pages::update_pages($pages, $newPages, $navPages);
pages::save_pages($newPages);
pages::remove_deleted_pages($pages, $newPages);
pages::sitemap($navPages);
return array('status' => 0, 'pages' => pages::reduce_pages($newPages));
}