QL\QueryList::_allowTags PHP Method

    private function _allowTags($html, $tags_str)
    {
        $tagsArr = $this->_tag($tags_str);
        $html = $this->_removeTags($html, $tagsArr[1]);
        $allow = '';
        foreach ($tagsArr[0] as $tag) {
            $allow .= "<{$tag}> ";
        }
        return strip_tags(trim($html), $allow);
    }