$feed = new Feed();
        $feed->title = 'YiiPowered';
        $feed->setWebMaster('sam@rmcreative.ru', 'Alexander Makarov');
        // ...
        foreach ($projects as $project) {
            $url = Url::to(['project/view', 'id' => $project->id, 'slug' => $project->slug], true);
            $item = new Item();
            $item->title = $project->title;
            // ...
            $item->setAuthor('noreply@yiipowered.com', implode(', ', $authors));
            $feed->addItem($item);
        }
        $feed->render();