Question

There are two arrays:

 $arr1 = array(1,2,3);
 $arr2 = array(0,0,1);

I need to make pairwise subtraction of these two arrays. The result for arr1 – arr2 should be:

$arr3 = array(1,2,2).

Do I need to use FOR loop to to this or is there any quicker way?

Answer 1

How about this function?

function array_sub_values($arr1, $arr2)
{
    $result = array();
    foreach ($arr1 as $k => $val)
        $result[] = $val - $arr2[$k];
    return $result;
}

So you can do:

$arr1 = array(1, 2, 3);
$arr2 = array(0, 0, 1);

$arr3 = array_sub_values($arr1, $arr2);