if(!function_exists("mb_convert_encoding"))
    {
        echo "<option>缺少模块</option>\n";
    }
    else
    {
        $sencode=mb_list_encodings();
        usort($sencode,"___sortcmp");
        foreach($sencode as $encode)
        {
            if($encode == "pass")
            {
                continue;
            }
            if(function_exists("mb_encoding_aliases"))
            {
                $alias=mb_encoding_aliases($encode);
                echo "\n<optgroup label=\"$encode\">\n";
                echo "<option value=\"$encode\">$encode</option>\n";
                if(is_array($alias)) if(count($alias) >=1)
                {
                    usort($alias,"___sortcmp");
                    foreach($alias as $encodealias)
                    {
                        echo "<option value=\"$encode\">$encodealias</option>\n";
                    }
                }
                echo "</optgroup>\n";
            }
            else
            {
                echo "<option value=\"$encode\">$encode</option>\n";
            }
        }
    }

echo '<option value="UTF-8">UTF-8</option>';