Sorting array of objects

Hi there, Supposed I have an array of objects, like: $this[$i]->property1 $this[$i]->property2 is there any 'cheap' way to sort the array according to the values of property1? The only way I thought I would be able to accomplish this is to transform this into an assoc array or something like it and then sort it ... I found plenty of functions for dealing with plain arrays, but nothing - easy to use - for this. Am I just blind or do I finally have to write a function doing that on my own? And if so - anyone who had to do this before and come up with a really fast solution (I guess my attempts would work - but not very efficient) Thanks Richard