在PHP中查找多维数组中键的位置

$key = array_search($value, $array);

function searchKeyInMultiArray($key, $array) {
    foreach ($array as $k => $v) {
        if ($k === $key) {
            return $k;
        } elseif (is_array($v)) {
            $result = searchKeyInMultiArray($key, $v);
            if ($result !== false) {
                return $k . ' -> ' . $result;
            }
        }
    }
    return false;
}

// 示例多维数组
$multiArray = array(
    'key1' => 'value1',
    'key2' => array(
        'subkey1' => 'subvalue1',
        'subkey2' => 'subvalue2',
    ),
    'key3' => 'value3',
);

// 查找键的位置
$key = 'subkey2';
$result = searchKeyInMultiArray($key, $multiArray);

// 输出结果
echo "键 '$key' 的位置是：$result";