验证数组

Question

How can I validate the multidimensional array.My array is like

Array
(
    [level] => Array
        (
            [1] => 1
            [2] => 2
        )

    [subject] => Array
        (
            [1] => Array
                (
                    [0] => 4
                    [1] => 9
                )

            [2] => Array
                (
                    [0] => 4
                )

        )

)

I want to check the keys for [level] is in [subject]. Please help me. How it is possible.

Answer 1

if (count(array_intersect_key($array['level'], $array['subject'])) !=
    count($array['level'])) {
    echo 'level and subject have different keys';
}