[PHP] Array Sorting Headaches

[Burhan Khalid]

Greetings everyone :

  Having a hard time with this one. I have a multi-dim array 
$foo[$x][$y]['key'], where $x and $y are numeric. Here is some sample data :

Array
(
[$x] => Array
        (
            [0] => Array
                (
                    [invoiceid] => 11842
                    [product] => myproduct
                    [domain] => foo.net
                    [expires] => February 28, 2004
                )
            [1] => Array
                (
                    [invoiceid] => 10295
                    [product] => myotherproduct
                    [domain] => foo.net
                    [expires] => December 9, 2003
                )
            [2] => Array
                (
                    [invoiceid] => 10202
                    [product] => product1
                    [domain] => foo.bar
                    [expires] => January 19, 2003
                )
            [3] => Array
                (
                    [invoiceid] => 10005
                    [product] => product2
                    [domain] => foo.bar
                    [expires] => December 11, 2002
                )
        )
)
I need to filter the results so that I get the latest expiry date for 
each product.  The expires field actually contains a timestamp.  So for 
the sample array above, the resultant array would have only keys 0 and 
2, filtering out all the rest.  There are around 180+ main entries, with 
any number of sub entries, but each sub entry has the same four keys.

Any ideas? Getting a rather large headache mulling over this.

Thanks again,
Burhan
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