php - Create messages conversation list -

ok, trying build conversation list in php of messages user has. database setup there 4 fields, sender id, receiver id, timestamp, , message. query returns every result receiver id equals current users id. want select first occurrences of every sender's id. ie:

================================================== | sender id | receiver id |    time    | message | ================================================== |     2     |      1      | 1373914164 |   test  | <--- 1 |     2     |      1      | 1373914155 | ..test  | |     1     |      1      | 1373914134 |...test  | <--- 1 |     2     |      1      | 1373914111 |   test. | |     1     |      1      | 1373914108 |   test..| |     3     |      1      | 1373914102 |   test  | <--- 1 |     3     |      1      | 1373914101 |   test  | ================================================== 

my idea filter results in array using php, i'm @ total brain fart here. ideas?

you can sql sorting time , limiting 1

something like

select .... order time desc limit 1