sort array by key

Hi,

What I want is simple, but I can't figure it out at the moment.

Let's say this is an array names $matches:

Array
(
[0] => Array
(
[teamid] => 137
[teamnaam] => Weet ik Veel ??
[speeldagid] => vr
[speeldagvolgnr] => 5
)

[1] => Array
(
[teamid] => 27
[teamnaam] => Tycoon
[speeldagid] => di
[speeldagvolgnr] => 2
)

[2] => Array
(
[teamid] => 36
[teamnaam] => Arabier 1
[speeldagid] => do
[speeldagvolgnr] => 4
)

[3] => Array
(
[teamid] => 105
[teamnaam] => Road Runners
[speeldagid] => do
[speeldagvolgnr] => 4
)
)

And I want to sort it on key 'speeldagvolgnr', how do I do this?
So I want the array back


Array
(
[0] => Array
(
[teamid] => 27
[teamnaam] => Tycoon
[speeldagid] => di
[speeldagvolgnr] => 2
)

[1] => Array
(
[teamid] => 36
[teamnaam] => Arabier 1
[speeldagid] => do
[speeldagvolgnr] => 4
)

[2] => Array
(
[teamid] => 105
[teamnaam] => Road Runners
[speeldagid] => do
[speeldagvolgnr] => 4
)
[3] => Array
(
[teamid] => 137
[teamnaam] => Weet ik Veel ??
[speeldagid] => vr
[speeldagvolgnr] => 5
)
)




I have looked at the sort functions at PHP.net, but could not find the solution.

Can you help me out? Thanx.

Boefje wrote:
> What I want is simple, but I can't figure it out at the moment.

Try usort()
http://www.php.net/usort

> Let's say this is an array names $matches:
>
> Array
> (
> [0] => Array
> (
> [teamid] => 137
> [teamnaam] => Weet ik Veel ??
> [speeldagid] => vr
> [speeldagvolgnr] => 5
> )
(snip)

> And I want to sort it on key 'speeldagvolgnr', how do I do this?
(snip)

> I have looked at the sort functions at PHP.net, but could not find the solution.
>
> Can you help me out? Thanx.

Not tested

<?php
function sort_matches($left, $rite) {
if ($left['speeldagvolgnr'] == $rite['speeldagvolgnr']) return 0;
return $left['speeldagvolgnr'] < $rite['speeldagvolgnr'] ? -1 : 1;
}

// populate $matches
usort($matches, 'sort_matches');
// print_r($matches);
?>

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Indeed! Thanks for pointing me in the right direction.

It can be done more simple. See next example.

<?php

function multi_sort($array, $key)
{
function compare($a, $b)
{
return strcmp($a[$key], $b[$key]);
}
usort($array, "compare");
return $array;
}

$fruits[0]["fruit"] = "lemons";
$fruits[0]["vendor"] = "Jansens lemons";
$fruits[1]["fruit"] = "apples";
$fruits[1]["vendor"] = "De Bruins apples";
$fruits[2]["fruit"] = "grapes";
$fruits[2]["vendor"] = "Pietersens grapes";

multi_sort($fruits, "fruit");

echo '<pre>';
print_r($fruits);
echo '</pre>';

?>