聚合某些键的数组值

Question

I'm facing a great question in how to manage my array.

Array ( [0] => Array ( [0] => Rule [1] => 0,5 [2] => Name [3] => Task ) [1] => Array ( [0] => Another rule [1] => 2 [2] => name [3] => Task ) [2] => Array ( [0] => Rule [1] => 1 [2] => name [3] => Sub-Task ) [3] => Array ( [0] => Another rule [1] => 1 [2] => another name [3] => Sub-Task ) [4] => Array ( [0] => Rule [1] => 1 [2] => another name [3] => Task ) etc...

I need to aggregate (in another array) values for "name" and "task" just to have this view:

name -> task -> 10 -> rule
     -> task -> 5 -> another rule
     -> Sub Task -> 20 -> another rule
     -> Sub task -> 0 -> rule
another name -> task -> 10 -> rule
         -> task -> 5 -> another rule
         -> Sub Task -> 20 -> another rule
         -> Sub task -> 0 -> rule

It's a bit hard to do for me and I cannot figure out how to manage it.

I've tried array_map, several foreach with if condition inside, but nothing.

Can anybody help me?

Thanks