Multidimensional array sort

[rivka]

I'm a little confused, and not sure how to do this. How do I do a sort on a multidimensional array?

Here's an example of my array, simply called $array:

[0] => Array
(
[date] => 2006-12-03 01:42:21
[price] => 1.00
[uFirst] => Zeek Group
[uLast] => User
[entity] => 1195
)

[1] => Array
    (
        [date] => 2006-12-04 10:19:59
        [price] => 35.00
        [uFirst] => Tom
        [uLast] => Carpenter
        [entity] => 725
    )

[2] => Array
    (
        [date] => 2006-12-03 10:09:21
        [price] => 35.00
        [uFirst] => Terri
        [uLast] => Schultz
        [entity] => 781
    )

Let's say I wanted to sort these by date descending? Is it possible?

[Weedpacket]

Yes, it is possible (PHP wouldn't be much of a programming language if it wasn't.) See [man]array_multisort[/man] or [man]usort[/man]

[NogDog]

Here's a usort() version:

<?php
// test data:
$array = array
(
   array(
      'date' => '2006-12-03 01:42:21',
      'price' => 1.00,
      'uFirst' => 'Zeek Group',
      'uLast' => 'User',
      'entity' => 1195
   ),
   array
   (
      'date' => '2006-12-04 10:19:59',
      'price' => 35.00,
      'uFirst' => 'Tom',
      'uLast' => 'Carpenter',
      'entity' => 725
   ),
   array
   (
      'date' => '2006-12-03 10:09:21',
      'price' => 35.00,
      'uFirst' => 'Terri',
      'uLast' => 'Schultz',
      'entity' => 781
   )
);
// sorting callback function:
function mysort($a, $b)
{
   return(strtotime($b['date']) - strtotime($a['date']));
}
// pre-sort:
echo "<pre>Before:\n";
print_r($array);
// do the sort:
usort($array, 'mysort');
// show the result:
echo "After:\n";
print_r($array);
echo "</pre>";
?>

[rivka]

Beautiful, NogDog. Exactly what I was looking for.