Increase values in array by array

Question

I have a head array:

Array
(
    [0] => 10
    [1] => 10
    [2] => 10
    [3] => 10
    [4] => 10
    [5] => 10
)

And my second array looks like this:

Array
(
    [0] => 1
    [1] => 7
    [2] => 3
    [3] => 1
    [4] => 1
    [5] => 7
)

Now I want to increase values in my head array by values in the second array.

Result should look like this:

Array
(
    [0] => 11
    [1] => 17
    [2] => 13
    [3] => 11
    [4] => 11
    [5] => 17
)

How can I do that?

Patrick.

Answer 1

How about the following:

$result = array_map(function () {
    return array_sum(func_get_args());
}, $arr1, $arr2);

func_get_args() fetches one element from each array, array_sum() adds those two values, and array_map() creates the new array. Original idea from this answer.

---

Or, if you want to use a loop, try the following:

$result = array();

for($i=0,$count=count($arr1); $i < $count; $i++) {
  $result[$i] = $arr1[$i] + $arr2[$i];
}

Output:

Array
(
    [0] => 11
    [1] => 17
    [2] => 13
    [3] => 11
    [4] => 11
    [5] => 17
)

Demo

Answer 2

The simpler is the better.

foreach ($a1 as $index => &$value) {
    $value += $a2[$index];
}

Answer 3

for($i = 0; $i < count($headArray); $i++)
    $headArray[$i] += $secondArray[$i];