如何把数组的key索引转化成数字索引

//读取文件
    function ReadConfig($filename)
    {
        if(file_exists($filename) == false)
        {
            //echo "
文件".$filename."不存在！
";
            return NULL;
        }
        return parse_ini_file($filename,true);
    }

//测试
    $Setting = array();
    $res = array();
    $Setting = ReadConfig("webconfig.ini");
    print_r($Setting);

Array
(
    [web] => Array
        (
            [host] => localhost
            [connuser] => root
            [connpwd] => root
            [conndb] => myoffice
        )

)