Sort 3d array by 1st level keys, then the 2nd level by lone 3rd level key

Question

I have a multidimensional array like this:

[
    'user 1' => [
        ['item 4' => '11385'],
        ['item 2' => '144268'],
        ['item 1' => '65774'],
        ['item 9' => '98523'],
    ],
    'user 5' => [
        ['item 8' => '239233'],
    ],
    'user 2' => [
        ['item 4' => '53718'],
        ['item 1' => '154687'],
    ],
]

What I need to do is to simply sort my array first by users (first level keys), then by items (third level keys) ascending.

Desired result:

[
    'user 1' => [
        ['item 1' => '65774'],
        ['item 2' => '144268'],
        ['item 4' => '11385'],
        ['item 9' => '98523'],
    ],
    'user 2' => [
        ['item 1' => '154687'],
        ['item 4' => '53718'],
    ],
    'user 5' => [
        ['item 8' => '239233'],
    ],
]

Answer 1

ksort sorts by the key

$newArray = array();

# start by sorting users
$yourArray = ksort($yourArray);

# then sort sub items
foreach($yourArray as $user=>$theirItems) {
    $theirItems = ksort($theirItems); # assuming you still want to sort by key;
    $newArray[$user] = $theirItems;
}

var_dump($newArray);

Output: (Demo)

Warning: foreach() argument must be of type array|object, true given