从资源php读取空字节

Question

我有简单的tcp套接字。我必须从终端阅读消息。终端在消息中发送空字节。当我使用fgets（）获取消息时，我得到了它，但是它不完整，它没有空字节，所以我无法解析它。我应该使用什么功能？

class ServerController extends Controller
{
    public $connects = array();

    public function startServer()
    {
        $fp = fopen('lock.txt', 'w');
        flock($fp, LOCK_EX);
        fwrite($fp, "Server started!!! \n");
        flock($fp, LOCK_UN);
        fclose($fp);
        $socket = stream_socket_server("tcp://0.0.0.0:2215", $errno, $errstr);

        if (!$socket) {
            $this->writeLogs("Server stopped!!!\n");
            die("$errstr ($errno)\n");
        }


        while (true) {
            $read = $this->connects;
            $read []= $socket;
            $write = $except = null;

            if (!stream_select($read, $write, $except, null)) {
                break;
            }

            if (in_array($socket, $read)) {
                //есть новое соединение
                if (($connect = stream_socket_accept($socket, -1))) {
                    $this->writeLogs("New connect: ".$connect. "\n");
                    $this->connects[] = $connect;
                    $this->onOpen($connect);
                }
                unset($read[ array_search($socket, $read) ]);
            }

            foreach($read as $connect) {
                $data = fgets($connect);
                if (!$data) {
                    fclose($connect);
                    unset($this->connects[ array_search($connect, $this->connects) ]);
                    $this->onClose($connect);
                    continue;
                }

                $this->onMessage($connect, $data);
            }
        }

    }
    public function onOpen($connect) {
        $exists_row = Lock::where('resource_id', $connect)->first();
        if (!$exists_row) {
            Lock::create([
                'resource_id'=>$connect
            ]);
        }
    }

    public function onClose($connect) {
        Lock::where('resource_id', $connect)->delete();
    }

    public function onMessage($connect, $data) {
        $this->writeLogs("Message sent by terminal: \n" . $data . "\n");
        $protocol = new ConcoxProtocol($data, $connect);
        $this->writeLogs("Response sent by server: \n".$protocol->response."\n");
        fwrite($connect,$protocol->response);
    }

    public function sendMessage(Lock $lock, $command)
    {
        $command = new ServerCommand($command, $lock);
        $this->writeLogs("Command sent by server : \n" . $command->response . "\n");
        fwrite($this->connects[array_search($lock->resource_id, $this->connects)], $command->response);
    }

    public function writeLogs($str)
    {
        $fp = fopen('lock.txt', 'a');
        flock($fp, LOCK_EX);
        fwrite($fp, $str);
        flock($fp, LOCK_UN);
        fclose($fp);
    }
}