将多维关联数组转置为排序依据的多维索引数组和外部关联键

function transposeArray($array, $sortKey) {
    $sortValues = array_column($array, $sortKey);
    array_multisort($sortValues, SORT_ASC, $array);

    $transposedArray = [];
    foreach ($array as $item) {
        $currentArray = &$transposedArray;
        foreach ($item as $key => $value) {
            if (!isset($currentArray[$key])) {
                $currentArray[$key] = [];
            }
            $currentArray = &$currentArray[$key];
        }
        $currentArray = $value;
    }

    return $transposedArray;
}

// 示例用法
$originalArray = [
    ['name' => 'Alice', 'age' => 25, 'score' => 90],
    ['name' => 'Bob', 'age' => 30, 'score' => 85],
    ['name' => 'Charlie', 'age' => 20, 'score' => 95]
];

$transposedArray = transposeArray($originalArray, 'age');
print_r($transposedArray);