How to sort an array by sub key ?!!

[kdman]

If i have this array :

(
    [0] => Array
        (
            [id] => 9
            [date] => 2005
        )

[1] => Array
    (
        [id] => 10
         [date] => 2002
    )

[2] => Array
    (
        [id] => 11
        [date] => 2004
    )

)

Is there any function to sort it by date key ?

[laserlight]

You should be able to use [man]usort/man.