public function highlight($text, $words, $min = 3)
    {
        $words = AnConfig::unbox($words);
        settype($words, 'array');
        foreach ($words as $word) {
            if (strlen($word) >= $min) {
                $text = AnHelperString::str_ireplace($word, '<span class="an-text-highlight">'.$word.'</span>', $text);
            }
        }

        return $text;
    }