返回PHP多维数组中的所有节点值及其父节点

function getAllNodes($array, $parentKey = '') {
    $result = [];
    foreach ($array as $key => $value) {
        $currentKey = $parentKey . ($parentKey ? '->' : '') . $key;
        if (is_array($value)) {
            $result = array_merge($result, getAllNodes($value, $currentKey));
        } else {
            $result[$currentKey] = $value;
        }
    }
    return $result;
}

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

$result = getAllNodes($array);
print_r($result);

Array
(
    [a->b->c] => value1
    [a->b->d] => value2
    [a->e] => value3
    [f] => value4
)