Retrieve elements from data table and sum the same elements - php

Question

I have the table "orders" from woocommerce.
I filtered and get sorted the elements by status with GET request.
The results are copied to a JSON file.
So now, I want to find the elements with the same "product_id" and their values and summarize them to display in screen so I can print them.
For example:
"product_id": 45329,
"variation_id": 0,
"quantity": 1
"product_id": 48911,
"variation_id": 0,
"quantity": 1,
"product_id": 45329,
"variation_id": 0,
"quantity": 1
The output that I want to achieve is this:
45329 quantity 2
48911 quantity 1
Thanks!

Answer 1

Decode JSON with json_decode() and make calculations. Next example uses simplified JSON data, which I think matches the format from WooCommerce (I guess this format is from list orders GET request):
<?php
# JSON
$json = '
[
{
"id": 727,
"line_items": [
{
"id": 315,
"name": "Woo Single #1",
"product_id": 93,
"variation_id": 0,
"quantity": 2,
"tax_class": "",
"subtotal": "6.00",
"subtotal_tax": "0.45",
"total": "6.00",
"total_tax": "0.45",
"taxes": [
{
"id": 75,
"total": "0.45",
"subtotal": "0.45"
}
],
"meta_data": [],
"sku": "",
"price": 3
},
{
"id": 316,
"name": "Ship Your Idea – Color: Black, Size: M Test",
"product_id": 22,
"variation_id": 23,
"quantity": 1,
"tax_class": "",
"subtotal": "12.00",
"subtotal_tax": "0.90",
"total": "12.00",
"total_tax": "0.90",
"taxes": [
{
"id": 75,
"total": "0.9",
"subtotal": "0.9"
}
],
"meta_data": [
{
"id": 2095,
"key": "pa_color",
"value": "black"
},
{
"id": 2096,
"key": "size",
"value": "M Test"
}
],
"sku": "Bar3",
"price": 12
}
]
}
]';
$input = json_decode($json, true);
# Sum
$output = array();
foreach ($input as $order) {
foreach ($order["line_items"] as $item) {
$product_id = $item['product_id'];
$quantity = $item['quantity'];
if (!array_key_exists($product_id, $output)) {
$output[$product_id] = 0;
}
$output[$product_id] += $quantity;
}
}
#Output
foreach ($output as $key => $value) {
echo $key.' quantity '.$value.'<br>';
}
?>
Output:
93 quantity 2
22 quantity 1