HOOK fulltext_search - Как объединить результаты поиска?

<?php
 
class onForumFulltextSearch extends cmsAction {
 
	public function run(){
 
		$sources = array(
			'threads' => LANG_FORUM_THREADS_ON_FORUM,
			'posts' => LANG_FORUM_POSTS_ON_FORUM
		);
 
		$table_names = array(
			'threads' => 'forum_threads',
			'posts' => 'forum_posts'
		);
 
		$match_fields = array(
			'threads' => array('title', 'description'),
			'posts' => array('content_html')
		);
 
		$select_fields = array(
			'threads' => array('id', 'slug', 'title', 'description', 'date_pub'),
			'posts' => array('id', 'thread_id', 'content_html', 'date_pub')
		);
 
		$filters = array(
			'threads' => array(),
			'posts' => array()
		);
 
		$forum_model = $this->model;
 
		return array(
			'name'          => $this->name,
			'sources'       => $sources,
			'table_names'   => $table_names,
			'match_fields'  => $match_fields,
			'select_fields' => $select_fields,
			'filters'       => $filters,
			'item_callback' => function($item, $model, $sources_name, $match_fields, $select_fields) use ($forum_model){
				if ($sources_name == 'threads'){
 
					return array_merge($item, array(
						'url'      => href_to('forum', 'tfind', array($item['id'])),
						'title'    => $item['title'],
						'fields'   => array($item['description']),
						'date_pub' => $item['date_pub'],
						'image'    => ''
					));
 
				} else {
 
					$thread = $forum_model->getThread($item['thread_id']);
 
                    // скрытый текст
                    if(!empty($this->options['hidetext_enable'])){
 
                        $hidetext = cmsCore::isControllerExists('hidetext') ?
                            cmsCore::getController('hidetext') :
                            false;
 
                        if ($hidetext && !empty($item['content_html'])){
                            $item['content_html'] = $hidetext->parseHide($item['content_html']);
                        }
                    }
 
					return array_merge($item, array(
						'url'      => href_to('forum', 'pfind', array($item['id'])),
						'title'    => $thread['title'],
						'fields'   => array($item['content_html']),
						'date_pub' => $item['date_pub'],
						'image'    => ''
					));
				}
			}
		);
	}
}

 
if (!empty($item['thread_id'])) {$thread = $forum_model->getThread($item['thread_id']);}
else {$thread = $item;}
 
if (empty($item['content_html'])) {$item['content_html'] = $item['description'];}
 
                    // скрытый текст
if(!empty($this->options['hidetext_enable'])){
 
$hidetext = cmsCore::isControllerExists('hidetext') ?
cmsCore::getController('hidetext') :
                            false;
 
if ($hidetext && !empty($item['content_html'])){
 $item['content_html'] = $hidetext->parseHide($item['content_html']);
                        }
                    }
 
return array_merge($item, array(
			'url'      => href_to('forum', 'pfind', array($item['id'])),
			'title'    => $thread['title'],
			'fields'   => array($item['content_html']),
			'date_pub' => $item['date_pub'],
			'image'    => ''
));