GatewayWorker定时器为什么执行了del却没有生效

请教各位大神一个问题
 
我用GatewayWorker做了一个websocket定时向客户端发送数据的功能，通过利用定时器定时从某服务器获取数据，并发送给客户端。
 
且客户端可以切换发送数据的内容，每次切换回关掉之前的定时器后，再打开一个新的定时器。但是当我切换过快的话，却发现之前定时器没有被关闭，仍在发送数据，这样相当于发送了两次数据（比如，定时器时间间隔是5s执行一次，这时，出现的情况是相当于5s内会执行两次）。。（我测试了一下，如果我把切换的时间控制在2s的样子，则不会出现这个问题）
 
这是什么原因，应该如何解决？
 
在论坛中看见，说是多进程造成的，那我应该如何去把定时器放在同一个进程中。第一次玩GatewayWorker，还请大神指点一二
 

public static function onClose($client_id)
{
    // 向所有人发送
    global $this_client_id,$closed_data,$change2closed;
    Gateway::sendToAll(json_encode('closing'));
    if ($change2closed === true){
        $preBName = $closed_data['get']['preBName'];
        $pre_timer = $closed_data['get']['add_timer'];
        $BName = $closed_data['get']['BName'];
    }else{
        $preBName = $GLOBALS['client_id_groupName'][$client_id];
        $pre_timer = $GLOBALS[$preBName."_timer"];
    }
    $pre_countGroup =  Gateway::getClientCountByGroup($preBName);
    if ($pre_countGroup==0){
        GateWay::sendToAll(json_encode('To all start_deleting'));
        Gateway::sendToClient($this_client_id,json_encode('start_deleting'));
        $del_result = \Workerman\Lib\Timer::del($pre_timer);
        if ($del_result===false){
            GateWay::sendToAll(json_encode(array(
                'error'         =>  'del error!',
                'preBName'      =>  $preBName,
                'pre_timer'     =>  $pre_timer
            )));
        }
        unset($GLOBALS[$preBName."_timer"]);
        unset($GLOBALS['client_id_groupName'][$client_id]);
    }
    if ($change2closed === true){
        $check_countByGroup = Gateway::getClientCountByGroup($BName);
        if ($check_countByGroup!=0){
            Gateway::joinGroup($this_client_id,$BName);
            Gateway::sendToClient($this_client_id,json_encode(array(
                'type'      => 'addTimer',
                'client_id' => $this_client_id,
                'timer' => $GLOBALS[$BName."_timer"]
            )));
            Events::getXmlInfo($this_client_id,$closed_data,5);
        }else{
            Gateway::joinGroup($this_client_id,$closed_data['get']['BName']);
            Events::getXmlInfo($this_client_id,$closed_data,5);
            //调用定时函数为类的静态方法，具体可参考文档wokerman定时器手册
            $timer = \Workerman\Lib\Timer::add(5,array('Events','getXmlInfo'),array($this_client_id,$closed_data,5));
            $GLOBALS[$closed_data['get']['BName']."_timer"] = $timer;
            Gateway::sendToClient($this_client_id,json_encode(array(
                'type'      => 'addTimer',
                'client_id' => $this_client_id,
                'timer' => $timer
            )));
        }
        $change2closed = false;
        Gateway::sendToClient($this_client_id,json_encode('close_succeed'));
    }
}[/code]
[code] /*当客户端连接上gateway完成websocket握手时触发的回调函数。*/
public static function onWebSocketConnect($client_id,$data){
    $httpReal = ['http://local.test.com','http://mytest.test1.cn'];
    if (array_search($data['server']['HTTP_ORIGIN'],$httpReal) === false){
        Gateway::sendToClient($client_id,"HTTP_ORIGIN为".$data['server']['HTTP_ORIGIN']."与".$httpReal."不一致，请修改httpReal与HTTP_ORIGIN一致");
        Gateway::closeClient($client_id);
    }else{
        global $change2closed;
        $change2closed = false;
        $pre_cid = $data['get']['pre_cid'];
        if ($pre_cid != "null"){//主要用于做同平台账号切换时，通过判断pre_cid（即client_id）是否为null，null则为第一次加载（即首次通过浏览器窗口打开此页面）；若果不为空，则关闭这个client
            global $this_client_id,$closed_data;
            $this_client_id = $client_id;    //设置一个全局可供调用的当前client_id供on_Close触发时,可以调用到正在执行中的client_id
            $closed_data = $data;    //设置一个全局可供调用的$closed_data供on_Close触发时,可以调用到本次传过来的$data(主要是使用$data['get']中的数据)
            $change2closed = true;
            Gateway::sendToClient($client_id,json_encode('start closeClient'));
            Gateway::closeClient($pre_cid);
        }else{
            $check_countByGroup = Gateway::getClientCountByGroup($data['get']['BName']);
            Gateway::sendToClient($client_id,json_encode(array(
                'first-load'             =>  '**********************',
                'check_countByGroup'     =>  $check_countByGroup
            )));
            if ($check_countByGroup!=0){
                Gateway::joinGroup($client_id,$data['get']['BName']);
                $GLOBALS['client_id_groupName'][$client_id] = $data['get']['BName'];
                Gateway::sendToClient($client_id,json_encode(array(
                    'type'      => 'addTimer',
                    'client_id' => $client_id,
                    'timer' => $GLOBALS[$data['get']['BName']."_timer"]
                )));
                Events::getXmlInfo($client_id,$data,5);
            }else{
                Gateway::joinGroup($client_id,$data['get']['BName']);
                $GLOBALS['client_id_groupName'][$client_id] = $data['get']['BName'];
                Events::getXmlInfo($client_id,$data,5);
                //调用定时函数为类的静态方法，具体可参考文档wokerman定时器手册
                if ($GLOBALS[$data['get']['BName']."_timer"] === null){
                    $timer = \Workerman\Lib\Timer::add(5,array('Events','getXmlInfo'),array($client_id,$data,5));
                    $GLOBALS[$data['get']['BName']."_timer"] = $timer;
                }
                Gateway::sendToClient($client_id,json_encode(array(
                    'type'      => 'addTimer',
                    'client_id' => $client_id,
                    'timer' => $timer
                )));
            }
        }
    }
}