How to merge array and sum up the values depending on key? - php

Question

I have an array something like below. I want to merge the nested array and display the totals. Here ID = 60.I want to merge this [0] and [1] depending in the ID value i.e., 60.
Array(
[0] => Array
(
[ID] => 60
[TOTAL] => 500
)
[1] => Array
(
[ID] => 60
[TOTAL] => 600
)
[2] => Array
(
[ID] => 61
[TOTAL] => 600
)
)
I tried with two for loops
foreach($result as $key=>$value){
foreach($result as $key1 => $value1){
// Do stuffs here
}
}
I want the output as
Array(
[0] => Array(
[ID] =>60
[TOTAL] => 1100
)
[1] =>Array(
[ID] =>61
[TOTAL] => 600
)
)

Answer 1

<?php
$result = Array(
Array
(
'ID' => 60,
'TOTAL' => 500
),
Array
(
'ID' => 60,
'TOTAL' => 600
),
Array
(
'ID' => 61,
'TOTAL' => 600
)
);
$set = [];
foreach($result as $data){
if(!isset($set[$data['ID']])) $set[$data['ID']] = 0;
$set[$data['ID']] += $data['TOTAL'];
}
$result_set = [];
foreach($set as $id => $total){
$result_set[] = [
'ID' => $id,
'TOTAL' => $total
];
}
print_r($result_set);
Demo: https://3v4l.org/NMmHC
We store IDs as keys in our $set array and keep adding the total to it whenever we come across the same key in the foreach loop.
In the end, we collect the results in a new array with ID and it's respective total.

Answer 2

My suggestion is to use array_reduce() which iteratively reduce the array to a single value using a callback function.
$arr = [['ID' => 60,'TOTAL' => 500],['ID' => 60,'TOTAL' => 600],['ID' => 61,'TOTAL' => 600]];
$arr = array_reduce($arr, function($acc, $new) {
if (!isset($acc[$new['ID']])) {
$acc[$new['ID']] = $new;
return $acc;
}
$acc[$new['ID']]['TOTAL'] += $new['TOTAL'];
return $acc;
}, []);
echo '<pre>', print_r(array_values($arr));
Working demo.

Answer 3

Solution 1
$arrayvariable=Array(
[0] => Array
(
[ID] => 60
[TOTAL] => 500
)
[1] => Array
(
[ID] => 60
[TOTAL] => 600
)
[2] => Array
(
[ID] => 61
[TOTAL] => 600
)
)
$output = array_reduce($arrayvariable, function (array $compare, array $item) {
$intrestkey = $item ['ID'];
if (array_key_exists($intrestkey, $compare)) {
$compare [$intrestkey] ['TOTAL'] += $item ['TOTAL'];
} else {
$compare [$intrestkey] = $item;
}
return $compare;
}, array());
$incremetedmerged_array = array_values($output);
print_r($incremetedmerged_array); //Produces
Array(
[0] => Array(
[ID] =>60
[TOTAL] => 1100
)
[1] =>Array(
[ID] =>61
[TOTAL] => 600
)
)