sort associative array by key value - php

Question

I try to sort my array by "delais_livraison" by DESC in php but i dont know how i can do that
In the first level I expected to have in first Etoile => 25 and then Feuillage => 10
Array
(
[A] => Array
(
[0] => Array
(
[Feuillage] => Array
(
[delais_livraison] => 10
)
)
[1] => Array
(
[Étoiles] => Array
(
[delais_livraison] => 25
)
)
)
[B] => Array
(
[0] => Array
(
[Grenouillère] => Array
(
[delais_livraison] => 7
)
)
[1] => Array
(
[Chaussons] => Array
(
[delais_livraison] => 0
)
)
)
)
Edit :
this how my array has been build
pastebin

Answer 1

Just try with:
$data = array(
'A' => array(
array('Feuillage' => array('delais_livraison' => 10)),
array('Étoiles' => array('delais_livraison' => 25)),
),
'B' => array(
array('Grenouillère' => array('delais_livraison' => 7)),
array('Chaussons' => array('delais_livraison' => 0)),
),
);
foreach ($data as &$group) {
usort($group, function($itemA, $itemB){
$a = current($itemA)['delais_livraison'];
$b = current($itemB)['delais_livraison'];
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
});
}
Output:
array (size=2)
'A' =>
array (size=2)
0 =>
array (size=1)
'Étoiles' =>
array (size=1)
'delais_livraison' => int 25
1 =>
array (size=1)
'Feuillage' =>
array (size=1)
'delais_livraison' => int 10
'B' => &
array (size=2)
0 =>
array (size=1)
'Grenouillère' =>
array (size=1)
'delais_livraison' => int 7
1 =>
array (size=1)
'Chaussons' =>
array (size=1)
'delais_livraison' => int 0
Solution uses anonymous function that has been introduced in PHP 5.3.0. For older versions just create a function and specify it in usort function:
function my_sort_function($itemA, $itemB){
// ...
}
usort($group, 'my_sort_function');

Answer 2

Since your array has two levels, how do you want to manage a global sort ?
Do you want to do a sort for each sub array ( A, B, ...) ?
In this case the approach will be to use function uksort for each sub array (A and B) and define your own compare function to compare delais_livraison values.

Answer 3

You would appear to be looking for ksort, or, if you have to supply your own comparison function, uksort.