PHP 二維陣列按鍵值排序

<?php
//創建一個二維陣列，希望按照 order 排序
$array[] = [
  'id' => 2,
  'name' => 'ccc',
  'order' => 3,
];

$array[] = [
  'id' => 0,
  'name' => 'aaa',
  'order' => 0,
];

$array[] = [
  'id' => 1,
  'name' => 'bbb',
  'order' => 1,
];

usort($array, function($a, $b) {
    return $a['order'] - $b['order'];
});

echo '排序後的結果';
echo "<pre>".print_r($array, 1)."</pre>";

?>

排序後的結果

Array
(
    [0] => Array
        (
            [id] => 0
            [name] => aaa
            [order] => 0
        )

    [1] => Array
        (
            [id] => 1
            [name] => bbb
            [order] => 1
        )

    [2] => Array
        (
            [id] => 2
            [name] => ccc
            [order] => 3
        )

)

usort 運作原理的說明，可以參考這篇