Array problem

Hi there, I am pulling picture ids out of a db and comment ids. The comments belong to the pic ids and are stored in two seperate tables. I am having trouble with the arrays to display them after pulling out of the db. The data is filled like this: while (rows etc.){ $comment_id[$row->pic_id][] = $row->comment_id; } The goal is to cycle through that array and display the picture followed by the belonging comments: Picture ID 1 -Comment 1 to pic_id 1 -Comment 2 to pic_id 1 -Comment 3 to pic_id 1 Picture ID 2 -Comment 1 to pic_id 2 -Comment 2 to pic_id 2 That does sound easy, but unfortunatelly I could not figure it out so far. Can somebody give me a hint on how to cycle throug the arrays, or an alternative way to achive my goal? Thank you for any help. Best regards, Merlin