how can I sort this array by timestamp?

[unomateo]

I have an array of posts that I need to sort by date. I use an rss reader to get the posts, but it fills the array by post, and not by data. I then need to parse the array to display the posts by date.
How can I do this? is there a way to insert the data into the array based on the timestamp? Or should I insert the data and then sort by the timestamps?

    [0] => Array
        (
            [Image] => img45981a3031aad.jpg
            [Title] => New post!
            [Timestamp] => 1163832505
        )

[1] => Array
    (
        [Image] => img45981a3031aad.jpg
        [Title] => Hello world!
        [Timestamp] => 1167594226
    )

[2] => Array
    (
        [Image] => img45981a3031aad.jpg
        [Title] => Yoyo!
        [Timestamp] => 1167594201
    )

[bradgrafelman]

Amazing what you can find if you search the board...