php4 html_specialchars_decode function 함수 구현

function htmlspecialchars_decode($string,$style=ENT_COMPAT)
    {
        $translation = array_flip(get_html_translation_table(HTML_SPECIALCHARS,$style));
        if($style === ENT_QUOTES){ $translation['''] = '\''; }
        return strtr($string,$translation);
    }