[gmarik]

What do you think about this? It must work on Windows as well as on UNIX:

PHP Code:

 function DeWin($path) 
{ 
    if(substr($path,1,1)==':') 
        $path=substr($path,2); 
    return str_replace('//','/',str_replace('\','/',$path)); 
} 

function document_root() 
{ 
    global $HTTP_SERVER_VARS; 
    $s=&$HTTP_SERVER_VARS; 

    if(isset($s['CMDLINE'])) return false; 

    $full=DeWin($s['PATH_TRANSLATED']); 
    $i_am=DeWin($s['PHP_SELF']); 
    if(substr($full,-strlen($i_am))==$i_am) 
        return substr($s['PATH_TRANSLATED'],0,strlen($s['PATH_TRANSLATED'])-strlen($i_am)); 

    return getenv('DOCUMENT_ROOT'); 
}