Advanced Array Help

I have an array of values that I want to be able to report on based on
a hierarchy:

[0] =>
array(3) {
["Hardware"] => "Desktop PC"
["Vendor"] => "IBM"
["Model"] => "123"
[1] =>
array(3) {
["Hardware"] => "Desktop PC"
["Vendor"] => "IBM"
["Model"] => "234"
[2] =>
array(3) {
["Hardware"] => "Laptop"
["Vendor"] => "IBM"
["Model"] => "456"
[3] =>
array(3) {
["Hardware"] => "Desktop PC"
["Vendor"] => "Dell"
["Model"] => "567"
[4] =>
array(3) {
["Hardware"] => "Desktop PC"
["Vendor"] => "IBM"
["Model"] => "123"

I want to be able to create a report like this using a data set similar
to the above array:

Desktop PC -4
IBM - 3
123 - 2
234 - 1
456 - 1
Dell - 1
567 - 1
Laptop - 1
IBM - 1
456 -1

So basically it is a tree, but keeps track of a count for each node, as
some entries may be duplicates.

.

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