Need assistance with a usort requirement

Question

I've taken a look at a few googles and actually found this stack too: How to sort a date array in PHP

I'ts on the same wave length but i'm not sure i get it clearly. I've read over the phpnet documentation too... As I said, i'm feeling shakey from it.

I have an array:

Array
(
    [0] => Array
        (
            [created] => 2012-06-06 21:26:25
        )

    [1] => Array
        (
            [created] => 2012-06-06 21:23:45
        )

)

And I basically need to sort this array so that they are in date order. How does this call back function work for usort? Any examples would be great!

Answer 1

function MySort($a, $b)
{
    if ($a['created'] == $b['created']) return 0;
    return $a['created'] < $b['created'] ? -1 : 1;
}

then use...

usort($myarray, "MySort");

Answer 2

usort just lets you sort using your own criteria. You can just simply do this:

usort($array, function($a, $b){
    $a = strtotime($a['created']);
    $b = strtotime($b['created']);
    return $a-$b;
});