Associative Array SUM by key value php [duplicate] - php

Question

This question already has answers here:
Associative array, sum values of the same key
(5 answers)
Closed 2 years ago.
I want to sum an array and grouping them by its key value.
this is the array :
Array
(
[0] => Array
(
[delivery_plan] => 80::2020/07
[additional_amount_usd] => 32.88
)
[1] => Array
(
[delivery_plan] => 80::2020/09
[additional_amount_usd] => 16.44
)
[2] => Array
(
[delivery_plan] => 80::2020/07
[additional_amount_usd] => 32.88
)
)
I want output to be like this :
Array
(
[0] => Array
(
[delivery_plan] => 80::2020/07
[additional_amount_usd] => 65.76
)
[1] => Array
(
[delivery_plan] => 80::2020/09
[additional_amount_usd] => 16.44
)
I have tried using this code, but the output different from my expected result :
$arr = [];
foreach ($section_balance as $sb => $val) {
if(array_key_exists($sb, $arr)){
$arr[$sb] += array_sum($val);
} else {
$arr[$sb] = array_sum($val);
}
}
i've got tis result instead :
Array
(
[0] => 112.88
[1] => 96.44
[2] => 112.88
)
How can i solve this ?

Answer 1

This is one way to do it breaking it down into steps...
1.Create the Array that sums the matching delivery_plans
2.Rebuild the Array as required
<?php
$sum_array = [];
foreach($array as $item) {
if (key_exists($item['delivery_plan'], $sum_array)) {
$sum_array[$item['delivery_plan']] += $item['additional_amount_usd'];
} else {
$sum_array[$item['delivery_plan']] = $item['additional_amount_usd'];
}
}
$final_array = [];
foreach($sum_array as $key => $value) {
$final_array[] = ['delivery_plan' => $key, 'additional_amount_usd' => $value];
}
Refactoring the above so the code is not dependant upon hardcoded index names...
$key_name = 'delivery_plan';
$value_name = 'additional_amount_usd';
$sum_array = [];
foreach($array as $item) {
if (key_exists($item[$key_name], $sum_array)) {
$sum_array[$item[$key_name]] += $item[$value_name];
} else {
$sum_array[$item[$key_name]] = $item[$value_name];
}
}
$final_array = [];
foreach($sum_array as $key => $value) {
$final_array[] = [$key_name => $key, $value_name => $value];
}
And you could then turn that into a function if you so desired...
The result is (using var_dump())
array(2) {
[0]=>
array(2) {
["delivery_plan"]=>
string(13) "80::2020 / 07"
["additional_amount_usd"]=>
float(65.76)
}
[1]=>
array(2) {
["delivery_plan"]=>
string(13) "80::2020 / 09"
["additional_amount_usd"]=>
float(16.44)
}
}
Update:
Also Take a look at the solution provided by Kevin.
3v4l.org/h9Q5L