how to add values of two arrays with common index in php?

Question

Consider the following arrays:

Array 1 with contents:

index1    value2
a         5
b         6
c         2

And Array 2 with contents:

index2   value2
a         4
b         2

i need an Array 3 which should be the sum of the above 2 arrays. Something like:

index     value
a           9
b           8
c           2

Please format your question in correct way to get answer – Alive to die - Anant May 15 '15 at 10:35 — Alive to die - Anant, May 15 '15 at 10:35
Have you tried something to get to your goal? – Rizier123 May 15 '15 at 10:35 — Rizier123, May 15 '15 at 10:35
i have formatted, please review the question.. – Ravi May 15 '15 at 10:36 — Ravi, May 15 '15 at 10:36

score 1 · Answer 1 · answered May 15 '15 at 10:49

This function will be what you need:

function array_merge_with_sum_values(array $array1, array $array2){
        $finalArray = array_merge($array1, $array2);
        $keys = array_keys($finalArray);
        foreach($keys as $key){
            if(isset($array1[$key]) && isset($array2[$key])){
                $finalArray[$key] = $array1[$key] + $array2[$key];
            }
        }
        return $finalArray;
    }

score 0 · Answer 2 · answered May 15 '15 at 10:52

maybe this helps you:

$array_first = ['a'=>5,'b'=>6,'c'=>2];
$array_second = ['a'=>4,'b'=>2];
function sum_array($array_first,$array_second){
$array_result = [];
foreach ($array_first as $key => $value) {
    if(isset($array_second[$key])){
        $array_result[$key] = $array_second[$key] + $array_first[$key];
    }else{
        $array_result[$key] = $array_first[$key];
    }
}
return $array_result;}
var_dump(sum_array($array_first,$array_second));

Result :

 array(3) {
  ["a"]=>
  int(9)
  ["b"]=>
  int(8)
  ["c"]=>
  int(2)
}

how to add values of two arrays with common index in php?

2 Answers2