PHP - Sort multi-dimensional array by another array

Question

I\'m trying to sort a multi-dimensional array by another array, but have so far come up short.
array_multisort seems be working only for real sorting.

Suppose I

Answer 1

For those of you who want to sort data based on an array with actual IDs, rather than based on an array with indexes like in the accepted answer - you can use the following simple comparison function for the usort:

usort($data, function($a, $b) use ($order) {
    $posA = array_search($a['id'], $order);
    $posB = array_search($b['id'], $order);
    return $posA - $posB;
});

---

So the following example will work fine and you won't get the Undefined offset notices and an array with null values:

$order = [20, 30, 10];

$data = [
    ['id' => 10, 'title' => 'Title 1'],
    ['id' => 20, 'title' => 'Title 2'],
    ['id' => 30, 'title' => 'Title 3']
];

usort($data, function($a, $b) use ($order) {
    $posA = array_search($a['id'], $order);
    $posB = array_search($b['id'], $order);
    return $posA - $posB;
});

echo '
', var_dump($data), '
';

Output:

array(3) {
  [0]=>
  array(2) {
    ["id"]=>
    int(20)
    ["title"]=>
    string(7) "Title 2"
  }
  [1]=>
  array(2) {
    ["id"]=>
    int(30)
    ["title"]=>
    string(7) "Title 3"
  }
  [2]=>
  array(2) {
    ["id"]=>
    int(10)
    ["title"]=>
    string(7) "Title 1"
  }
}