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socket_recvfrom timeout?

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I have got a script that sends a message to a server and waits for a response, but I can't find any way to make it timeout after say 2 seconds. Here is (the relevant bit of) my code:[code]function query ($ip, $port = 29900) {
  $buf = chr (254).chr (253).chr (0).chr (4).chr (5).chr (6).chr (7).chr (255).
  chr (255).chr (255).chr (1);
  $socket = socket_create (AF_INET, SOCK_DGRAM, SOL_UDP);
  socket_set_option ($socket, SOL_SOCKET, SO_BROADCAST, 1);
  socket_sendto ($socket, $buf, strlen ($buf), 0, $ip, $port);
  $packet = null;
  if (!socket_recvfrom ($socket, $packet, 2048, 0, $ip, $port)) {
    $players = -1;
  } else {
    $players = parse ($packet);
  return $players;

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