如何随时获取当前请求ID/$connection->id呢?

$req_id = $connection->id; //这样可以获取当当前连接ID

class Co {
   public static $id;
   public static function id($id)
   {
       if ($id) {
           static::$id = $id;
       }
       return static::$id;
   }
}

$http_worker->onMessage = function(TcpConnection $connection, Request $request)
{
    // 业务开始时设置id
    \Co::id($connection->id);
    // 真实业务省略...
    // 获取id
    echo \Co::id();
};