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                            # Gateway::getClientCountByGroup
## 說明:
~~~
int Gateway::getClientCountByGroup(mixed $group);
~~~
獲取某分組當前在線成員數（多少client_id在線）。

## 參數
* $group
分組名字

## 返回值
返回一個數字

## 范例
~~~
use \GatewayWorker\Lib\Gateway;

class Events
{
    ...
    public onConnect($client_id)
    {
        $group = 'romm-1';
        Gateway::joinGroup($client_id, $group);
        var_export(Gateway::getClientCountByGroup($group));
    }
    ...
}
~~~
打印出的數據類似如下：
~~~
16
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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