将节点(多维php数组的)中的最后一个元素移到开头？

function moveLastElementToStart(&$array) {
    if (is_array($array)) {
        $lastKey = end(array_keys($array));
        $lastValue = $array[$lastKey];
        unset($array[$lastKey]);
        $array = array_merge([$lastKey => $lastValue], $array);
        foreach ($array as &$value) {
            moveLastElementToStart($value);
        }
    }
}

// 示例数组
$array = [
    'a' => [
        'b' => [
            'c' => 'value1',
            'd' => 'value2'
        ],
        'e' => 'value3'
    ],
    'f' => 'value4'
];

moveLastElementToStart($array);

print_r($array);

Array
(
    [f] => value4
    [a] => Array
        (
            [b] => Array
                (
                    [d] => value2
                    [c] => value1
                )

            [e] => value3
        )

)