Getmxrr for windows server

gistfile1.txt

/*
Workaround, because Windows hosts suck ass big time
Requires: 
    nslookup - ie. Windows - with access to 4.2.2.* 
    PHP >= 4.0.3 
    shell_exec() enabled - ie. safe mode disabled 
*/
function getmxrr($host, &$mx, &$weight=NULL){ 
    $res=explode("\n",strstr(shell_exec('nslookup -type=mx '.escapeshellarg($host).' 4.2.2.3'),$host)); 
    if(!isset($res[1])){ 
        $mx[]=FALSE; 
        return FALSE; 
    } 
    foreach($res as $v){ 
        $w=explode(' ',$v); 
        $mx[]=$w[7]; 
        if(isset($weight)){ 
            $weight[]=$w[3]{0}; 
        } 
    } 
    unset($mx[count($mx)-1]); 
    unset($weight[count($weight)-1]); 
    return TRUE; 
}