QL\QueryList::_tag PHP Method

    private function _tag($tags_str)
    {
        $tagArr = preg_split("/\\s+/", $tags_str, -1, PREG_SPLIT_NO_EMPTY);
        $tags = array(array(), array());
        foreach ($tagArr as $tag) {
            if (preg_match('/-(.+)/', $tag, $arr)) {
                array_push($tags[1], $arr[1]);
            } else {
                array_push($tags[0], $tag);
            }
        }
        return $tags;
    }