How to create a JSON from table PHP - php

Question

How to create a json like this in php;
[{"idorder":"34",
"totalOrder":"55",
"products":[{"idproduct":"5","price":"10"},{"idproduct":"4","price":"45"}]
}]
from table mysql;
+---------+-----------+--------------+
| idorder | idproduct | priceproduct |
+---------+-----------+--------------+
| 1 | 4 | 45 |
| 1 | 5 | 10 |
+---------+-----------+--------------+
my current code something.php;
...
$result = $conn->query($pendientesq);
$return_arr = array();
$productos = array();
$r1=$result->fetch_array();
$return_arr['idorder'] = $r1['idorder'];
$return_arr['totalOrder'] = '55';
//But now????How to create sub array with multiples products.
echo json_encode($return_arr);

Answer 1

you need to try something like this:
$r1=$result->fetch_array();
$return_arr['idorder'] = $r1['idorder'];
$return_arr['totalOrder'] = '55';
// suposse total products are 10
$product=10;
for($i=0;$i<product;$i++){
$return_arr['product'][] = array("idproduct"=>$i,"price"=>$i);//use your price and idproduct.
}
echo json_encode($return_arr);

Answer 2

I don't know how Your table looks like because You've not described it.
But I got for example "orders" table with idorder,idproduct,priceproduct fields.
And wrote this code:
// $q = "SELECT * FROM orders WHERE idorder = 5"; // for single order
$q = "SELECT * FROM orders";
$result = $conn->query($q);
$orders = [];
while($record=$result->fetch_array()) {
if(!isset($orders[$record['idorder']])) {
$orders[$record['idorder']] = [];
$orders[$record['idorder']]['idorder'] = $record['idorder'];
$orders[$record['idorder']]['totalOrder'] = 0;
$orders[$record['idorder']]['products'] = [];
}
$orders[$record['idorder']]['products'][] = ['idproduct' => $recrod['idproduct'],
'price' => $record['priceproduct']];
$orders[$record['idorder']]['totalOrder'] += $record['priceproduct'];
}
$orders = array_values($orders);
echo json_encode($orders);