Get last key-value pair in PHP array

I have an array that is structured like this:

[33] => Array
    (
        [time] => 1285571561
        [user] => test0
    )

[34] => Array
    (
        [time] => 1285571659
        [user] => test1
    )

[35] => Array
    (
        [time] => 1285571682
        [user] => test2
    )

How can I get the last value in the array, but maintaining the index [35]?

The outcome that I am looking for is this:

[35] => Array
    (
        [time] => 1285571682
        [user] => test2
    )