Help with Array Sorting Please

Hi, If you scroll up the list you'll see another thread of mine, this is related. The reason for a new thread is that i've made a lot of progress but the old was getting really confusing.. Here's the scoop: I have an array like this: 123 => 1 // each value may have few or many duplicate values 321 => 1 543 => 2 432 => 2 // like here, more 2's than 1's see? 566 => 2 568 => 2 999 => 3 878 => 3 444 => 3 Now, the keys are not the issue. What i would really like, is for that array, to end up like this: 123 => 1 543 => 2 999 => 3 321 => 1 432 => 2 878 => 3 123 => 1 566 => 2 and so on... The important point here is that it does not matter if a key is repeated in the resultant array, in fact, that's *good* as long as it starts from the beggining again when there are no more values = (for example) '1' With me? If it helps to understand, each key is an IP address, each value a Machine number - my job is to never hit the same machine 2x in a row or the same IP 2x in a row, but to cycle through all the IP's on each Machine like the example resultant array. Phew... that was tough to explain, hope it's not a brain twister to understand ;-) Many, many thanks.. -- Nick W