mysql/php, group by userID, sort by time -

I have a table that holds the userID, highest score and a timestamp.

Sort by timestamp I would like, so that the latest entries are on the top, and also, do not show any user ID twice in the list, so they need to be grouped.

I also need to sort by

  $ sql = "SELECT * $ DESC by user ID order by table group";   
 $ sql2 = "SELECT * FROM $ table group by user id order scores dsc";  
 At this time, I think that the group is done first, so I might get some random timestamps / tickets. I need to order them first, group them though, if I I want to order if I get errors.  
 Can anyone help me out here? Thanks   
 
 
  group  ing is always done before  ORDER < / Code> ing To order a record before grouping, there are 2 approaches: 
 
 
 
 Apply subquery and then  GROUP BY  in  ORDER BY  . This is not usually a better way because running a sub-education is very expensive, especially if you have many records for small records, it's going to be okay. 
 
  $ sql = "Select * from (select * to $ table DESC at the time of ORDER) by group" URIID ";  
 
 
 
 There is a better solution for getting a  maximum (time)  in a subquery and then  userID < / Code> and maximum time. 
 
  SELECT p1 * From $ table T1 INNER JOIN (SELECT MAX (time) maxtime, $ User ID by $ table number) t2 ON. T1.userID = T2.userID and t1.time = t2.MaxTime command t1.time DESC;  
 
 
 
 I have written them from above my head. 
 
 HH