case 'login':
                // 判斷是否有房間號(hào)
                if(!isset($message_data['room_id']))
                {
                    throw new \Exception("\$message_data['room_id'] not set. client_ip:{$_SERVER['REMOTE_ADDR']} \$message:$message");
                }

                // 把房間號(hào)昵稱放到session中
                $room_id = $message_data['room_id'];
                $client_name = htmlspecialchars($message_data['client_name']);
                $_SESSION['room_id'] = $room_id;
                $_SESSION['client_name'] = $client_name;

                // 獲取房間內(nèi)所有用戶列表 
                $clients_list = Gateway::getClientSessionsByGroup($room_id);
                foreach($clients_list as $tmp_client_id=>$item)
                {
                    //如果有重名的用戶，通知對(duì)方退出并刪除列表
                    if($item['client_name']==$client_name){
                        self::onClose($tmp_client_id);
                        unset($clients_list[$tmp_client_id]);
                        continue;
                    }
                    $clients_list[$tmp_client_id] = $item['client_name'];
                }
                $clients_list[$client_id] = $client_name;

                // 轉(zhuǎn)播給當(dāng)前房間的所有客戶端，xx進(jìn)入聊天室 message {type:login, client_id:xx, name:xx} 
                $new_message = array('type'=>$message_data['type'], 'client_id'=>$client_id, 'client_name'=>htmlspecialchars($client_name), 'time'=>date('Y-m-d H:i:s'));
                Gateway::sendToGroup($room_id, json_encode($new_message));
                Gateway::joinGroup($client_id, $room_id);

                // 給當(dāng)前用戶發(fā)送用戶列表 
                $new_message['client_list'] = $clients_list;
                Gateway::sendToCurrentClient(json_encode($new_message));
                return;

self::onClose($tmp_client_id);

調(diào)用onClose方法，可以通知對(duì)方logout，但是client_id依然存在，對(duì)方刷新以后會(huì)有多個(gè)client_id，造成兩方無(wú)法聊天，請(qǐng)大神看一下這是怎么回事