Question

I have an array in the format of

Array
(
    [0] => Array
        (
            [platform] => 1
            [sales] => 244
            [total] => 245971.00
            [average] => 1008.08
        )

    [1] => Array
        (
            [platform] => 2
            [sales] => 273
            [total] => 280454.48
            [average] => 1027.31
        )

    [2] => Array
        (
            [platform] => 3
            [sales] => 290
            [total] => 273408.00
            [average] => 942.79
        )

)

and another array

Array
(
    [0] => Array
        (
            [platform] => 1
            [sales] => 243
            [total] => 245231.00
            [average] => 1128.08
        )

    [1] => Array
        (
            [platform] => 2
            [sales] => 233
            [total] => 2804248
            [average] => 103.31
        )

    [2] => Array
        (
            [platform] => 3
            [sales] => 293
            [total] => 223408.00
            [average] => 942.29
        )

)

How could I add these arrays together to create an array of all the values added.

For example, [sales] => 244 from the first array containing platform 11 and [sales] => 243 in the seconds array containing platform 1. I want to combine them into an array where [sales] => 487 (244 + 243) for platform 1.

Thanks in advance

Answer 1

Assuming the two arrays have an exact 1:1 match between their respective keys:

$new_arr = array();
foreach($arr1 as $main_key => $sub_arr) {
    foreach($sub_arr as $sub_key => $val) {
        $new_arr[$main_key][$sub_key] = $val + $arr2[$main_key][$sub_key];
    }
}

where $arr1 and $arr2 are your two original arrays.