tl_current_session

function tl_current_session ()，获取用户当前所在频道实时信息

可能的返回值如下：

{"code":"current_session","session":{"type":"channel","cid":"766"},"listen_chans":[],

"presences":[{"uid":"171","nickname":"dhui"},{"uid":"167","nickname":"kanyulun"},{"uid":"168","

nickname":"jiangyaowu"}]}