multidimensional array sort

["Ashley M. Kirchner" <ashley@xxxxxxxxxx>]

   I have a multidimensional array that's built as follows (it's pretty 
much a directory tree):

Array (
 [Dir1] => Array (
     [User1] => Array (
         [0] => File1
         [1] => File2
     )
     [User2] => Array {
         [0] => File1
         [1] => File2
         [2] => File3
     }
 )
 [Dir2] => Array (
     [User1] => Array (
         [0] => File1
         [1] => File2
         [2] => File3
         [3] => File4
     )
     [User2] => Array {
         [0] => File1
     }
 )
)

   I need to do a sort on the whole thing in such a way that:
      a) all the Dir#'s are in ascending order, and
      b) all the User#'s are in ascending order with each Dir#, and
      b) all the File#'s are also in ascending order within each User#

   I don't suppose there's an easy way to do this, other than doing it 
in several steps, is there?  Is there even a way to JUST sort the Dir#'s 
(and the rest gets done at a later stage in the script)?

   -- A

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