php：在多维数组中只获取最高值

Question

My nested array looks like:

[Minion] => Array
    (
        [old_first_name] => "\345\205\265"
        [old_last_name] => "\345\274\265"
        [old_name] => "\345\205\265\345\274\265"
    )

[Evil Minion] => Array
    (
        [old_first_name] => "\347\251\216"
        [old_last_name] => "\345\274\265"
        [old_name] => "\345\274\265\347\251\216"
    )

[Minion 2] => Array
    (
        [old_first_name] => "\345\212\233"
        [old_last_name] => "\345\274\265"
        [old_name] => "\345\274\265\345\212\233"
    )

How do I just get Minion, Evil Minion, and Minion 2?

I tried a for loop but it's just looping through the contents of Minion which isn't what I want!

Answer 1

Use the array_keys function:

$keys = array_keys($array);
var_dump($keys);

This works for any array, whether it's one-dimensional or multi-dimensional.