create tree view like json from existing combined array - php

Question

I have one combined array of order and its items combined into one array but i am trying to create json structure like order then its items list like wise.
$combinedarray[]=array('orderid'=>1,'partycode'=>10,"item"=>'abc',"price"=>250);
$combinedarray[]=array('orderid'=>1,'partycode'=>10,"item"=>'xyz',"price"=>250);
$combinedarray[]=array('orderid'=>2,'partycode'=>20,"item"=>'pqr',"price"=>250);
$combinedarray[]=array('orderid'=>2,'partycode'=>20,"item"=>'lmn',"price"=>250);
Output should be like
[
"0":[
{
"OrderNo": "1",
"partycode": "10",
"OrderDetails": [
{
"Item": "abc",
"price": 250
},
{
"Item": "xyz",
"price": 250
}
]
}
],
"1":[
{
"OrderNo": "2",
"partycode": "20",
"OrderDetails": [
{
"Item": "pqr",
"price": 250
},
{
"Item": "lmn",
"price": 250
}
]
}
]
]
This is What i Tried
$mainarray = array();
$orderarray = array();
$orderitemarray = array();
if (count(combinedarray) > 0) {
foreach (combinedarray as $obj) {
$orderarray[] = array("orderid" => $obj->orderid);
$orderitemarray[] = array("Item" => $obj->Item, "price" => $obj->price);
}
}
$mainarray[] = array_unique($orderarray);
$mainarray['OrderDetails'] = $orderitemarray;
echo json_encode($mainarray);

Answer 1

$mainarray = array();
foreach ($combinedarray as $x) {
$id = $x['orderid'];
unset($x['orderid']);
if (! isset($mainarray[$id])) {
$mainarray[$id]['OrderNo'] = $id;
}
$mainarray[$id]["OrderDetails"][] = $x;
}
// Now $mainarray has indexes equal to OrderNo. To count it from zero, use array_values
echo json_encode(array_values($mainarray), JSON_PRETTY_PRINT);
demo

Answer 2

By your given array
$combinedarray[]=array('orderid'=>1,'partycode'=>10,"item"=>'abc',"price"=>250);
$combinedarray[]=array('orderid'=>1,'partycode'=>10,"item"=>'xyz',"price"=>250);
$combinedarray[]=array('orderid'=>2,'partycode'=>20,"item"=>'pqr',"price"=>250);
$combinedarray[]=array('orderid'=>2,'partycode'=>20,"item"=>'lmn',"price"=>250);
Here is my solution for this
$new = array();
foreach($combinedarray as $r){
$new[$r['orderid']]['orderid'] = $r['orderid'];
$new[$r['orderid']]['partycode'] = $r['partycode'];
$new[$r['orderid']][] = array("item"=>$r['item'],"price"=>$r['price']);
}
$json = json_encode($new);
echo '<pre>';print_r($new);
echo $json;