使用 GatewayWorker + redis 使用出现问题

使用 GatewayWorker + redis 使用出现问题，

我在 Events.php 中做如下处理

public static function onWorkerStart($businessWorker) 中初始化redis 

      $redis = new redis();
          $redis -> connect('127.0.0.1',6379);
          echo "启动redis\n";

public static function onMessage($client_id, $message) 中存储数据

         $redis->zAdd($key, $i, $redis_str);

但是启动后，显示如下错误：

PHP Notice:  Undefined variable: redis in /GatewayWorker/Applications/YourApp/Events.php on line 149

Notice: Undefined variable: redis in /GatewayWorker/Applications/YourApp/Events.php on line 149
PHP Fatal error:  Call to a member function zAdd() on a non-object in /GatewayWorker/Applications/YourApp/Events.php on line 149

Fatal error: Call to a member function zAdd() on a non-object in /GatewayWorker/Applications/YourApp/Events.php on line 149
WORKER EXIT UNEXPECTED E_ERROR Call to a member function zAdd() on a non-object in /GatewayWorker/Applications/YourApp/Events.php on line 149
worker exit with status 65280
启动redis

不晓得是何原因哦，偶是新手，请各位大哥多多指点，感激不尽。