function ping($host, $port, $timeout) { 
  $tB = microtime(true); 
  $fP = fSockOpen($host, $port, $errno, $errstr, $timeout); 
  if (!$fP) { return "N/A"; } 
  $tA = microtime(true); 
  return round((($tA - $tB) * 1000), 0); 
}

//Print ping("www.google.com", 80, 5);