function print_collection_list($list)
{
    foreach ($list as $collection) {
        if ($collection instanceof OCA\News\Folder) {
            $tmpl_folder = new OCP\Template("news", "part.listfolder");
            $tmpl_folder->assign('folder', $collection);
            $tmpl_folder->printpage();
            print_collection_list($collection->getChildren());
            echo '</ul></li>';
        } elseif ($collection instanceof OCA\News\Feed) {
            //onhover $(element).attr('id', 'newID');
            $itemmapper = new OCA\News\ItemMapper();
            $items = $itemmapper->findByFeedId($collection->getId());
            $counter = 0;
            foreach ($items as $item) {
                if (!$item->isRead()) {
                    ++$counter;
                }
            }
            $tmpl_feed = new OCP\Template("news", "part.listfeed");
            $tmpl_feed->assign('feed', $collection);
            $tmpl_feed->assign('unreadItemsCount', $counter);
            $tmpl_feed->printpage();
        } else {
            //TODO:handle error in this case
        }
    }
}
<?php

$feedId = isset($_['feedid']) ? $_['feedid'] : '';
$itemMapper = new OCA\News\ItemMapper();
$showAll = OCP\Config::getUserValue(OCP\USER::getUser(), 'news', 'showAll');
$specialfeed = false;
if ($feedId == -1 || $feedId == -2) {
    //TODO: change this values, too obscure
    $specialfeed = true;
    $status = $feedId == -1 ? OCA\News\StatusFlag::IMPORTANT : OCA\News\StatusFlag::UNREAD;
    $items = $itemMapper->findEveryItemByStatus($status);
} else {
    if ($showAll) {
        $items = $itemMapper->findByFeedId($feedId);
    } else {
        $items = $itemMapper->findAllStatus($feedId, OCA\News\StatusFlag::UNREAD);
    }
}
echo '<ul>';
foreach ($items as $item) {
    if ($item->isRead()) {
        $newsItemClass = "read";
    } else {
        $newsItemClass = "";
    }
    if ($item->isImportant()) {
        $starClass = 'important';
        $startTitle = $l->t('Mark as unimportant');
    } else {
        $starClass = '';
        $startTitle = $l->t('Mark as important');