Simplifying the array by removing same key values - php

Question

I have a Array like this
Array
(
[0] => Array
(
[vendor_id] => 2
[vendor_total_order] => 80
)
[1] => Array
(
[vendor_id] => 2
[vendor_total_order] => 100
)
[2] => Array
(
[vendor_id] => 1
[vendor_total_order] => 150
)
[3] => Array
(
[vendor_id] => 3
[vendor_total_order] => 80
)
[4] => Array
(
[vendor_id] => 5
[vendor_total_order] => 150
)
[5] => Array
(
[vendor_id] => 1
[vendor_total_order] => 110
)
)
I want to simplify this array in such a way that if the 'vendor_id' are same for two values there there accumulated/summed value should be assigned to 'vendor_total_order' to that 'vendor_id'(basically we are removing values which are having same vendor_id with the total value of duplicates).
So when i provide the above array as input the output should look like as follow
Array
(
[0] => Array
(
[vendor_id] => 2
[vendor_total_order] => 180
)
[1] => Array
(
[vendor_id] => 1
[vendor_total_order] => 260
)
[2] => Array
(
[vendor_id] => 3
[vendor_total_order] => 80
)
[3] => Array
(
[vendor_id] => 5
[vendor_total_order] => 150
)
)
How can i do this ?

Answer 1

You just need to group them using a foreach. Example:
$total = array();
foreach ($array as $key => $value) {
if(!isset($total[$value['vendor_id']])) {
$total[$value['vendor_id']] = array('vendor_id' => $value['vendor_id'], 'vendor_total_order' => 0);
}
$total[$value['vendor_id']]['vendor_total_order'] += $value['vendor_total_order'];
}
$total = array_values($total); // simple reindex
echo '<pre>';
print_r($total);
Sample Output

Answer 2

Your best bet is to write a custom script that does the following:
Creates an empty new "result" array
Iterates over the current array and for each item:
If the item doesn't exist in result, insert it, otherwise update the total_value value as the sum of it's current value and the new item.
Save the result array