Selam,
Aşagıdaki şekilde denermisin.
$id=$_GET['id']; 
if($id!=40){ 
$site=file_get_contents("http://sitem.com/$id-uu.html");   
$idx=$id++;
}
$desen='#http://rapidshare.com/files/(.*?)" target="_blank">#si';      
preg_match_all($desen,$site,$diziatama);

foreach ($diziatama[1] as $val){
    
    echo $val;
}