Question

I have two multidimensional arrays that I need to determine the delta for each value. I know the array_diff function only returns the difference in keys. Is there a functon that will determine the delta for each set of values assuming the two arrays contain the same set of keys?

Example:

array_1(test1 => Array([key1] => 100, [key2] => 200 ) )

array_2(test1 => Array([key1] => 105, [key2] => 195 ) )

I would expect something like:

array_3(test1 => Array([key1] => 5, [key2] => -5 ) ) 

Are there any PHP methods to do this or am I on my own?

Answer 1

Answers here suggested using foreach loop but I think creating anonymous function will be easier:

<?php
    $count_delta = create_function('$a,$b', 'return $a - $b;');

    $arr1 = array(100, 200);
    $arr2 = array(20, 180);

    $delta = array_map($count_delta, $arr1, $arr2);

    var_dump($delta);

Output will be:

array
  0 => int 80
  1 => int 20