Parsing JSON array with unknown field names? - php

Question

So I have this json:
{
"success": true,
"rgInventory": {
"4580331488": {
"id": "4580331488",
"classid": "520025252",
"instanceid": "0",
"amount": "1",
"pos": 1
},
"4566197481": {
"id": "4566197481",
"classid": "1439482117",
"instanceid": "188530139",
"amount": "1",
"pos": 2
},
"4566196610": {
"id": "4566196610",
"classid": "1439484944",
"instanceid": "188530139",
"amount": "1",
"pos": 3
},
"4566097797": {
"id": "4566097797",
"classid": "310776859",
"instanceid": "302028390",
"amount": "1",
" pos": 4
},
"4565915026": {
"id": "4565915026",
"classid": "310776840",
"instanceid": "302028390",
"amount": "1",
" pos": 5
},
"4565415060": {
"id": "4565415060",
"classid": "1439489161",
"instanceid": "188530139",
"amount": "1",
"pos": 6
},
"4565413906": {
"id": "4565413906",
"classid": "1439484334",
"instanceid": "188530139",
"amount": "1",
"pos": 7
},
"4559798755": {
"id": "4559798755",
"classid": "520025252",
"instanceid": "0",
"amount": "1",
"pos": 8
},
"4553954652": {
"id": "4553954652",
"classid": "520025252",
"instanceid": "0",
"amount": "1",
"pos": 9
},
"4553694029": {
"id": "4553694029",
"classid": "991959905",
"instanceid": "0",
"amount": "1",
"pos": 10
},
"4553694015": {
"id": "4553694015",
"classid": "720289133",
"instanceid": "188530170",
"amount": "1",
" pos": 11
},
"4553694006": {
"id": "4553694006",
"classid": "1364486740",
"instanceid": "188530139",
"amount": "1",
"pos": 12
},
"4553693992": {
"id": "4553693992",
"classid": "1309991239",
"instanceid": "188530139",
"amount": "1",
"pos": 13
},
"4553693986": {
"id": "4553693986",
"classid": "310776711",
"instanceid": "302028390",
"amount": "1",
" pos": 14
}
}
I need to get it as an array and parse it. The problem is that this json is from my inventory and as I fetch other people's inventory the field are gonna change, and I can't figure out how to parse it.
So far I'm here:
$link='http://steamcommunity.com/profiles/'.$steamid.'/inventory/json/730/2';
$string = file_get_contents($link);
$obj = json_decode($string, true);
var_dump($obj['rgInventory']);
At this point I can get a result, but i don't know how to go beyond that, I mean, I need to return classid and instance id of each record, but hw can this be done in a JSON like that?

Answer 1

You can use a foreach loop
foreach ($obj['rgInventory'] as $key => $item) {
echo $key; // echo the "unknown" field name
echo $item['classid']; // echo any field value
}