How to sum all column values in multi-dimensional array?

Question

How can I add all the columnar values by associative key? Note that key sets are dynamic.

Input array:

Arr         


        

Answer 1

Here you have how I usually do this kind of operations.

// We declare an empty array in wich we will store the results
$sumArray = array();

// We loop through all the key-value pairs in $myArray
foreach ($myArray as $k=>$subArray) {

   // Each value is an array, we loop through it
   foreach ($subArray as $id=>$value) {

       // If $sumArray has not $id as key we initialize it to zero  
       if(!isset($sumArray[$id])){
           $sumArray[$id] = 0;
       }

       // If the array already has a key named $id, we increment its value
       $sumArray[$id]+=$value;
    }
 }

 print_r($sumArray);

Answer 2

Code here:

        $temp_arr = [];
        foreach ($a as $k => $v) {
            if(!is_null($v)) {
                $sum = isset($temp_arr[$v[0]]) ? ((int)$v[5] + $sum) : (int)$v[5];
                $temp_arr[$v[0]] = $sum;
            }
        }
        return $temp_arr;

Result:

{SEQ_OK: 1328,SEQ_ERROR: 561}

Answer 3

Here is a solution similar to the two others:

$acc = array_shift($arr);
foreach ($arr as $val) {
    foreach ($val as $key => $val) {
        $acc[$key] += $val;
    }
}

But this doesn’t need to check if the array keys already exist and doesn’t throw notices neither.

Answer 4

It can also be done using array_map :

$rArray = array(
    0 => array(
        'gozhi' => 2,
        'uzorong' => 1,
        'ngangla' => 4,
        'langthel' => 5
    ),
    1 => array(
        'gozhi' => 5,
        'uzorong' => 0,
        'ngangla' => 3,
        'langthel' => 2
    ),
    2 => array(
        'gozhi' => 3,
        'uzorong' => 0,
        'ngangla' => 1,
        'langthel' => 3
    ),
);

$sumResult = call_user_func_array('array_map', array_merge(['sum'], $rArray));

function sum()
{
    return array_sum(func_get_args());
}

Answer 5

$sumArray = array();
foreach ($myArray as $k => $subArray) {
    foreach ($subArray as $id => $value) {
        if (!isset($sumArray[$id])) {
            $sumArray[$id] = 0;
        }
        $sumArray[$id]+=$value;
    }
}

Answer 6

$sumArray = array();

foreach ($myArray as $k=>$subArray) {
  foreach ($subArray as $id=>$value) {
    if(!isset($sumArray[$id])){
     $sumArray[$id] =$value;
    }else {
     $sumArray[$id]+=$value;
    }
  }
}

print_r($sumArray);

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