Make unique array and add the amount in php - php

Question

I have to make the array to unique array list if the invoice_products_id is same and for the same invoice_products_id i have add the amount. I am able to make it unique but amount is not adding.
0 =>{
'id' => 9,
'invoice_products_id' => 2,
'amount' => 1.8,
},
1 =>{
'id' => 10,
'invoice_products_id' => 3,
'amount' => 2,
},
2 =>{
'id' => 11,
'invoice_products_id' => 2,
'amount' => 1.1,
},
3 =>{
'id' => 12,
'invoice_products_id' => 3,
'amount' => 1.2,
},
code:
$invtax=[];
foreach($invoiceProduct['invoice_taxes'] as $taxkey=>$taxval){
$ref=$taxval->invoice_products_id;
if(isset($invtax[$ref])){
$invtax[$ref]->amount+=$taxval->amount;
}else{
$invtax[$ref]=$taxval;
}
}
result:
2 =>{
'id' => 11,
'invoice_products_id' => 2,
'amount' => 2.9,
},
3 =>{
'id' => 12,
'invoice_products_id' => 3,
'amount' => 1.2,
},
expected:
2 =>{
'id' => 11,
'invoice_products_id' => 2,
'amount' => 2.9,
},
3 =>{
'id' => 12,
'invoice_products_id' => 3,
'amount' => 3.2,
},

Answer 1

Making use of array_filter and array_walk functions
See here for live example: https://3v4l.org/rXXR9
Input
<?php
$arr = [
[
'id' => 9,
'invoice_products_id' => 2,
'amount' => 1.8,
],[
'id' => 10,
'invoice_products_id' => 3,
'amount' => 2,
],[
'id' => 11,
'invoice_products_id' => 2,
'amount' => 1.1,
],[
'id' => 12,
'invoice_products_id' => 3,
'amount' => 1.2,
],
];
Program
<?php
$assorted_heap = [];
$filter_function = function($v, $k) {
global $assorted_heap;
if (isset($assorted_heap[$v['invoice_products_id']])) {
$assorted_heap[$v['invoice_products_id']][1] += $v['amount'];
return false;
} else {
$assorted_heap[$v['invoice_products_id']] = [$k, $v['amount']];
}
return true;
};
$walk_function = function(&$v, $k) {
global $assorted_heap;
$v['amount'] = $assorted_heap[$v['invoice_products_id']][1];
};
$new_arr = array_filter($arr,
$filter_function,
ARRAY_FILTER_USE_BOTH
);
array_walk($new_arr, $walk_function);
unset($assorted_heap);
print_r($new_arr);
Output
Array
(
[0] => Array
(
[id] => 9
[invoice_products_id] => 2
[amount] => 2.9
)
[1] => Array
(
[id] => 10
[invoice_products_id] => 3
[amount] => 3.2
)
)