原本 ping 功能都可正常運作,直到某天更新 PHP Server Monitor 版本後,突然失效
爬文找到這篇:Ping not working on 3.2.2 or on current development branch
修改 src/psm/Util/Server/Updater/StatusUpdater.php 裡的 updatePing function 整個替換掉後可正常運作

protected function updatePing($max_runs, $run = 1) {
  if ($max_runs == NULL || $max_runs > 1) $max_runs = 1;
  $txt = exec("ping -c " . $max_runs . " " . $this->server['ip']);
  $re1='.*?';     # Non-greedy match on filler
  $re2='[+-]?\\d*\\.\\d+(?![-+0-9\\.])';  # Uninteresting: float
  $re3='.*?';     # Non-greedy match on filler
  $re4='([+-]?\\d*\\.\\d+)(?![-+0-9\\.])';        # Float 1

  if ($c=preg_match_all ("/".$re1.$re2.$re3.$re4."/is", $txt, $matches)) {
    $result=$matches[1][0];
  } else { $result = NULL; }

  if (!is_null($result)) {
    $status = true;
  } else {
    $status = false;
  }
  //Divide by a thousand to convert to milliseconds
  $this->rtime =  $result / 1000;

  // check if server is available and rerun if asked.
  if(!$status && $run < $max_runs) {
    return $this->updatePing($max_runs, $run + 1);
  }
  return $status;
}