merge/sum multi dimentional array php

Question

I\'m trying to merge/sums 2 arrays that can contain integers or more arrays (themselves containing integer).

When the values are integers, I need to sum them in the

Answer 1

You can get all the keys for the foreach loop, live demo.

Note, you also can check if a key of any array is undefined, then save the defined value for the key.

function sumArrayValues($array1, $array2)
{
    $keys = array_keys($array1 + $array2);
    foreach ($keys as $key) 
    {
        if (is_array($array1[$key]) || is_array($array2[$key]))
            $array1[$key] = sumArrayValues($array1[$key], $array2[$key]);
        else
            @$array1[$key] = (int)$array1[$key] +(int)$array2[$key];
    }
    return $array1;
}