add multiple times from a mysql time field in php - php

Question

I have a table with the following structure and i want to get the sum of all the times for a certain album_id & disc. I found this http://board.phpbuilder.com/showthread.php?10326769-RESOLVED-time-help and it looked somewhat good (the first snippet of code in the first answer), but I cant figure out how to work it ith mysql...
Table Structure:
CREATE TABLE IF NOT EXISTS `tracks` (
`id` int(255) NOT NULL AUTO_INCREMENT,
`artist_id` int(255) NOT NULL,
`album_id` int(255) NOT NULL,
`disc` int(3) NOT NULL,
`track_no` int(3) NOT NULL,
`title` varchar(255) NOT NULL,
`length` time NOT NULL,
`size` decimal(20,1) NOT NULL,
`plays` int(255) NOT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `artist_id` (`artist_id`,`album_id`,`disc`,`track_no`,`title`)
) ;
Any help is greatly appreciated. I'm a noob!!!

Answer 1

Maybe this will do.
SELECT album_id, disc, SEC_TO_TIME(SUM(TIME_TO_SEC(length))) AS formatTime
FROM tracks
GROUP BY album_id, disc
HAVING album_id=id AND disc=disc
Alternative for only a certain album and disc:
SELECT album_id, disc, SEC_TO_TIME(SUM(TIME_TO_SEC(length))) AS formatTime
FROM tracks
WHERE album_id=id AND disc=disc

Answer 2

//this is the album we want
$album = 24;
//grab all the track lengths and plays from our album
$query = '
SELECT length, plays
FROM tracks
WHERE album_id = "'.$album.'";
//do our mysql query
$result = mysql_query($query) or die(mysql_error());
//now for every result do somthing like add the length of the songs or play count
$length = null;
$plays = null;
while ($row = mysql_fetch_assoc($result)) {
$length = $length + $row["length"];
$pays = $plays + $row["plays"];
}
//echo data to user
echo 'The total lenth of this albums is:'.$length.'mins';
echo 'this ablum as been played:'.$plays.'times';