Merge duplicates into one row and sum up values using php

Question

I have a table that hows the following rows...

ID     | TITLE   |   ARTIST    |   ADDED               |  HITS | HITS THIS WEEK
--------------------------------------------------------------------------------
7505   | Track 2 |   Artist 1  |   2009-08-24 10:32:41 |  1539 |  2
7483   | Track 2 |   Artist 1  |   2009-08-23 16:58:35 |  1450 |  3
7324   | Track 1 |   Artist 1  |   2009-08-14 11:28:18 |  5291 |  1
7320   | Track 1 |   Artist 1  |   2009-08-14 10:24:17 |  2067 |  1

What I want to do is is have the the duplicates add up the hits and hits this week and display as one row.

I want to fetch the mysql data as it is (with the duplicates), and then using php i wanna sum up the duplicates as one row for echo'ing.

Can someone tell me how I would go about this?

EDIT:

Heres my current sql query...

SELECT `files`.`file_id` , `files_meta`.`title` , `files_meta`.`artists` , `files`.`added` , `files`.`uniquehits` , `files`.`uniquehits_week` , `files_meta`.`filename`
FROM promo_artists
INNER JOIN promo_files ON promo_artists.id = promo_files.artist_id
INNER JOIN files ON files.file_id = promo_files.file_id
INNER JOIN files_meta ON files.file_id = files_meta.file_id
WHERE username = '$username' ORDER BY `files`.`added` DESC

Answer 1

foreach($rows as $row) {
 $data[$artist][$track] += $hits;
}

?

Answer 2

I'd be inclined to do it in SQL:

SELECT track, artist, SUM(hits) AS hits, SUM(hits_this_week) AS hits_this_week
  FROM Atable
 GROUP BY track, artist;

This saves having to do the computation in PHP, and reduces the traffic between PHP and the DBMS.