public static function getHtmlTags($content, $closeTags = true)
    {
        if ($closeTags == true) {
            $re = '@<[^>]*>@';
        } else {
            $re = '@<[^>/]*>@';
        }

        preg_match_all($re, $content, $matches, PREG_SET_ORDER, 0);

        if (isset($matches) && !empty($matches)) {
            $tags = array();
            foreach ($matches as $match) {
                $tags[] = $match[0];
            }

            $tags = array_unique($tags);

            return $tags;
        }

        return;
    }