I have an array which is created as a combination of two database queries from two separate databases, it looks similar to:

$arr1 = ;

I am looking for a way to group this array by part and type values. I also need to know the total of the count values as they are grouped.

The results would be something like:

$arr2 = ;

but I just can't see how to do this. I have seen a few examples of grouping by a single key/value, but not by multiple values at once.