$GroupUser=Db::query("SELECT * FROM chat_group_member WHERE group_id=(SELECT id FROM chat_group WHERE platform_group_id={$group_id}) AND is_close=0 LIMIT {$pre},{$pagesize} ");
//var_dump($GroupUser) ;
$total=Db::query("SELECT count(*) as total FROM chat_group_member WHERE group_id=(SELECT id FROM chat_group WHERE platform_group_id={$group_id}) AND is_close=0");