比较两个嵌套数组然后保持较小的值

I have this array

我有这个阵列

[
    'foo' => [
        '.fr' => 15,
        '.com' => 10,
        '.de' => 20,
    ],
    'bar' => [
        '.fr' => 12,
        '.com' => 16,
        '.de' => 18,
    ],
]
[
    'foo' => [