Tricky array question

Hi there, I am trying to get continent and country info out of an xml file. There is a continent element to each country element. Now I do have an array with the continent info and one with the country info. The goal is to be able to output all countries sorted after continents. So I do have: $results[]->countryContinent $results[]->countryName I tryed to group those values, to do array searches and more, but somehow it looks like that there must be a way more easy way to do this. Maybe someone has a good hint how to solve that. Thanx for any help, merlin