get sum of php multidiamentional array

I am looking to store sum of all keys inside an array here is my example code

<?php

// Sample data
$category = (object) ['category_name' => '32459*1500*lab*1,32460*400*lab*1,32461*600*lab*1'];
// process
$category_sale_data = explode(',', $category->category_name);
foreach ($category_sale_data as $key => $value) {
    
                list($sale_key, $sale_value) = explode('*', $value);
                $category->sale_data[$sale_key][] = $sale_value;
                //$category->sale_data_sum[$sale_key][] += $sale_value;
}
// display
print_r($category);

getting this output working example -> https://3v4l.org/NAKfb#v7.0.0

Here is expected to get //$category->sale_data_sum[$sale_key][] +=
$sale_value;

MEDevel.com: Open-source for Healthcare and Education

Collecting and validating open-source software for healthcare, education, enterprise, development, medical imaging, medical records, and digital pathology.

Visit Medevel

I am expected output like this

stdClass Object
(
    [category_name] => 32459*1500*lab*1,32460*400*lab*1,32461*600*lab*1
    [sale_data] => Array
        (
            [32459] => Array
                (
                    [0] => 1500
                )

            [32460] => Array
                (
                    [0] => 400
                )

            [32461] => Array
                (
                    [0] => 600
                )

        )
    [sale_data_sum] => 2500

)

>Solution :

Simply do this:

$category->sale_data_sum = 0; // initiate key
foreach ($category_sale_data as $key => $value) {
    list($sale_key, $sale_value) = explode('*', $value);
    $category->sale_data[$sale_key][] = $sale_value;
    $category->sale_data_sum += $sale_value; // add each sale value
}