<?
function foo($ip,$port)
{
$fp = fsockopen("udp://".$ip,$port);
socket_set_blocking($fp,FALSE);
fwrite($fp,"????info\x00");
while (!feof($fp))
	{
	$a = fread($fp,5000);
	if ($a) echo $a;
	}
fclose($fp);
}
?>

This code is for querying a HalfLife-Server (left out if 
($fp) ...).

It never leaves the while-loop because feof() never 
changes its state to TRUE.

The same method in C, Perl etc works perfectly so I assume 
there is a problems with PHP and UDP-Sockets.

(recent version from CVS do not work, too)