同步调用返回的offset值好像不对

[superli90]

我使用了同步调用的方式，返回的offset全是22，请问是哪里用错了吗？

require 'vendor/autoload.php';
  date_default_timezone_set('PRC');
  use Monolog\Logger;
  use Monolog\Handler\StdoutHandler;
  // Create the logger
  $logger = new Logger('my_logger');
  // Now add some handlers
  $logger->pushHandler(new StdoutHandler());

  $config = \Kafka\ProducerConfig::getInstance();
  $config->setMetadataRefreshIntervalMs(10000);
  $config->setMetadataBrokerList('ip:host');
  $config->setBrokerVersion('version');
  $config->setRequiredAck(1);
  $config->setIsAsyn(false);
  $config->setProduceInterval(500);
  $producer = new \Kafka\Producer();
  $producer->setLogger($logger);

for($i = 0; $i < 100; $i++) {
  $result = $producer->send(array(
    array(
      'topic' => 'test',
        'value' => "test$i....message.",
      'key' => "message_id is  a $i",
    ),
));
  echo "result is ".json_encode($result)."\n";
  }