Compare Array elements and add based on key and value - php

Question

I have two arrays like this:
$array_1 = Array ( [0] => 4 [1] => 6 [2] => 2 [3] => 6 [4] => 4 [5] => 10 [6] => 4 [7] => 6 [8] => 2 [9] => 2 [10] => 4 [11] => 4 [12] => 2 [13] => 2 );
$array_2 = Array ( [0] => DK [1] => GA [2] => DK [3] => GA [4] => DK [5] => GA [6] => WE [7] => VE [8] => WE [9] => VE [10] => PLA [11] => PRA [12] => PLA [13] => PRA ) ;
Now I want result like this:
$dk=4+2+4=10;
$ga=6+6+10=22;
$we=4+2=6;
$ve=6+2=8;
$pla=4+2=6;
$pra=4+2;
Explanation:
In $array_2, 'DK' exists 3 times and key values are = 0,2 and 4.
So, i have to add the values of $array_1 having key 0,2,4 and assign them to $dk. Here, $dk will be 4+2+4=10. This process will be same for all other variables.
How can i do this??

Answer 1

Instead separate variable name I suggest you to make array like this
<?php
$array_1 = [4,6,2,6];
$array_2 = [ 0=> "DK", 1=>"GA", 2=>"DK", 3=>"GA"];
$newArray = [];
foreach($array_2 as $key=>$value){
if(isset($newArray[$value])){
$newArray[$value] +=$array_1[$key];
}else{
$newArray[$value] =$array_1[$key];
}
}
print_r($newArray);
?>
Live Demo
Output :
Array
(
[DK] => 6
[GA] => 12
)
Another suggestion : Instead complex programming try to make good relation or binding to not get any inconsistency in records

Answer 2

This will loop array2 and build an array with the sum.
Then output it (just to see the result), then I use extract to pull out the variables as you want them.
But I would rather keep them in the array
Foreach($array_2 as $key => $val){
If(!isset($new[$val])) $new[$val] =0;
$new[$val] += $array_1[$key];
}
Var_dump($new);
Extract($new);
https://3v4l.org/jOR7Z