函数对php中的多维数组按键进行递归排序。

function recursiveSort(&$array) {
    foreach ($array as &$value) {
        if (is_array($value)) {
            recursiveSort($value);
        }
    }
    ksort($array);
}

// 示例多维数组
$array = array(
    'b' => array(
        'd' => 2,
        'c' => 1,
    ),
    'a' => array(
        'e' => 3,
        'f' => 4,
    ),
);

recursiveSort($array);

print_r($array);

Array
(
    [a] => Array
        (
            [e] => 3
            [f] => 4
        )

    [b] => Array
        (
            [c] => 1
            [d] => 2
        )

)