Sorry for my previous post. NOT array_reverce, array_flip is actual function. Correct function:

function Encode($str,$type=u)
{
    $conv=array();
    for($x=192;$x<=239;$x++)
        $conv[u][chr($x)]=chr(208).chr($x-48);
    for($x=240;$x<=255;$x++)
        $conv[u][chr($x)]=chr(209).chr($x-112);
    $conv[u][chr(168)]=chr(208).chr(129);
    $conv[u][chr(184)]=chr(209).chr(209);
    $conv[w]=array_flip($conv[u]);
    if($type=='w' || $type=='u')
        return strtr($str,$conv[$type]);
    else
        return $str;
}

Sorry for my English ;)