joining array values

Hi there, I do have a tricky problem with arrays. There are 3 arrays: $result[id][] $result[text][] $result[relevance][] Now there might be the case that there are more results with the same $id. I would like to count all the relevances together for the same id. For example: id text relevance 23 ok 2 42 joel 1 23 php 1 Desired output: id text relevance 23 ok php 3 42 joel 1 Has anybody an ide how to do that? Thank you for any help, Merlin