如何比较两个数组的键和值？

Question

I have two arrays where the first array keys are similar to second array values. I'd like to get a new array with values which are not in the first one. I tried to use array_intersect , but the result wasn't what I expected.

Here is a sample of the two arrays:

$array1 = array(
    'A' => 10,
    'B' => 20,
    'C' => 30,
    'D' => 40,
);
$array2 = array(
    '0' => 'A',
    '1' => 'B',
);

And I'm looking for a new array like this:

$array3 = array(
    '0' => 'C',
    '1' => 'D',
);

Answer 1

You can use this code:

$array1 = array('A' => 10,'B' => 20,'C' => 30,'D' => 40);
$array2 = array('0' => 'A','1' => 'B');
$array3 = array_keys(array_diff_key($array1, array_flip($array2)));

Answer 2

我的建议是使用array_diff ，但问题是它没有设置键

$array3 = array_diff(array_keys($array1, $array2))