我如何检查具有相似订单的数组中key =>值配对差异的数量？

Question

For example, if I have two arrays:

$array1 = array('a', 'b', 'c', 'd');

$array2 = array('a', 'c', 'b', 'd');

Assuming that both arrays have similar orders (based on the last and first values), how would I check to see that are two differences in their key value pairings, in their defined orders?

As well as this, how could I return (possibly through another function), where exactly these differences are, by key?

Answer 1

Using array_diff_assoc() with a callback will give you a result of the difference but only with the first arrays keys and values returned. If you want the second arrays differences, reverse the order of the parameters

$array1 = array('a', 'b', 'c', 'd');

$array2 = array('a', 'c', 'b', 'd');

function key_compare ($a, $b) {
    if ($a === $b) {
        return 0;
    }
    return ($a > $b)? 1:-1;
})

print_r(array_diff_uassoc($array1,$array2, "key_compare");

Result... Array ( [1] => b [2] => c )

Reversed...

print_r(array_diff_uassoc($array2,$array1, "key_compare");

Result... Array ( [1] => c [2] => b )