protected function strip_tags() {
		$params = func_get_args();
		$str = $params[0];

		for ($i = 1, $count = count($params); $i < $count; $i++) {
			$str = preg_replace('/<' . $params[$i] . '\b[^>]*>/i', '', $str);
			$str = preg_replace('/<\/' . $params[$i] . '[^>]*>/i', '', $str);
		}
		return $str;
	}