pocketmine\utils\Utils::getMachineUniqueId PHP Method

    public static function getMachineUniqueId($extra = "")
    {
        if (self::$serverUniqueId !== null and $extra === "") {
            return self::$serverUniqueId;
        }
        $machine = php_uname("a");
        $machine .= file_exists("/proc/cpuinfo") ? implode(preg_grep("/(model name|Processor|Serial)/", file("/proc/cpuinfo"))) : "";
        $machine .= sys_get_temp_dir();
        $machine .= $extra;
        $os = Utils::getOS();
        if ($os === "win") {
            @exec("ipconfig /ALL", $mac);
            $mac = implode("\n", $mac);
            if (preg_match_all("#Physical Address[. ]{1,}: ([0-9A-F\\-]{17})#", $mac, $matches)) {
                foreach ($matches[1] as $i => $v) {
                    if ($v == "00-00-00-00-00-00") {
                        unset($matches[1][$i]);
                    }
                }
                $machine .= implode(" ", $matches[1]);
                //Mac Addresses
            }
        } elseif ($os === "linux") {
            if (file_exists("/etc/machine-id")) {
                $machine .= file_get_contents("/etc/machine-id");
            } else {
                @exec("ifconfig", $mac);
                $mac = implode("\n", $mac);
                if (preg_match_all("#HWaddr[ \t]{1,}([0-9a-f:]{17})#", $mac, $matches)) {
                    foreach ($matches[1] as $i => $v) {
                        if ($v == "00:00:00:00:00:00") {
                            unset($matches[1][$i]);
                        }
                    }
                    $machine .= implode(" ", $matches[1]);
                    //Mac Addresses
                }
            }
        } elseif ($os === "android") {
            $machine .= @file_get_contents("/system/build.prop");
        } elseif ($os === "mac") {
            $machine .= `system_profiler SPHardwareDataType | grep UUID`;
        }
        $data = $machine . PHP_MAXPATHLEN;
        $data .= PHP_INT_MAX;
        $data .= PHP_INT_SIZE;
        $data .= get_current_user();
        foreach (get_loaded_extensions() as $ext) {
            $data .= $ext . ":" . phpversion($ext);
        }
        $uuid = UUID::fromData($machine, $data);
        if ($extra === "") {
            self::$serverUniqueId = $uuid;
        }
        return $uuid;
    }

 public function __construct(Server $server, $type, $playerList = [])
 {
     $endpoint = "http://" . $server->getProperty("anonymous-statistics.host", "stats.pocketmine.net") . "/";
     $data = [];
     $data["uniqueServerId"] = $server->getServerUniqueId()->toString();
     $data["uniqueMachineId"] = Utils::getMachineUniqueId()->toString();
     $data["uniqueRequestId"] = UUID::fromData($server->getServerUniqueId(), microtime(true))->toString();
     switch ($type) {
         case self::TYPE_OPEN:
             $data["event"] = "open";
             $version = new VersionString();
             $data["server"] = ["port" => $server->getPort(), "software" => $server->getName(), "fullVersion" => $version->get(true), "version" => $version->get(), "build" => $version->getBuild(), "api" => $server->getApiVersion(), "minecraftVersion" => $server->getVersion(), "protocol" => Info::CURRENT_PROTOCOL];
             $data["system"] = ["operatingSystem" => Utils::getOS(), "cores" => Utils::getCoreCount(), "phpVersion" => PHP_VERSION, "machine" => php_uname("a"), "release" => php_uname("r"), "platform" => php_uname("i")];
             $data["players"] = ["count" => 0, "limit" => $server->getMaxPlayers()];
             $plugins = [];
             foreach ($server->getPluginManager()->getPlugins() as $p) {
                 $d = $p->getDescription();
                 $plugins[$d->getName()] = ["name" => $d->getName(), "version" => $d->getVersion(), "enabled" => $p->isEnabled()];
             }
             $data["plugins"] = $plugins;
             break;
         case self::TYPE_STATUS:
             $data["event"] = "status";
             $data["server"] = ["ticksPerSecond" => $server->getTicksPerSecondAverage(), "tickUsage" => $server->getTickUsageAverage(), "ticks" => $server->getTick()];
             //This anonymizes the user ids so they cannot be reversed to the original
             foreach ($playerList as $k => $v) {
                 $playerList[$k] = md5($v);
             }
             $players = [];
             foreach ($server->getOnlinePlayers() as $p) {
                 if ($p->isOnline()) {
                     $players[] = md5($p->getUniqueId()->toBinary());
                 }
             }
             $data["players"] = ["count" => count($players), "limit" => $server->getMaxPlayers(), "currentList" => $players, "historyList" => array_values($playerList)];
             $info = Utils::getMemoryUsage(true);
             $data["system"] = ["mainMemory" => $info[0], "totalMemory" => $info[1], "availableMemory" => $info[2], "threadCount" => Utils::getThreadCount()];
             break;
         case self::TYPE_CLOSE:
             $data["event"] = "close";
             $data["crashing"] = $server->isRunning();
             break;
     }
     $this->endpoint = $endpoint . "api/post";
     $this->data = json_encode($data);
 }