Print value from inside an object - php

Question

I have really have troubles trying to work out why this is not working, and it seems like it should be easy, but just cannot seem to get it.
All I am looking to do is grab the sku field (which is VBP-01 below).
{
"variants": [
{
"id": 2314578,
"created_at": "2014-07-29T07:22:18.921Z",
"updated_at": "2015-05-21T15:42:42.136Z",
"product_id": 1188647,
"default_ledger_account_id": null,
"buy_price": "124.0",
"committed_stock": "0",
"incoming_stock": "3",
"composite": false,
"description": null,
"is_online": false,
"keep_selling": false,
"last_cost_price": "124.0",
"manage_stock": true,
"max_online": null,
"moving_average_cost": "124",
"name": "Lanparte battery pinch VBP-01",
"online_ordering": false,
"opt1": null,
"opt2": null,
"opt3": null,
"position": 1,
"product_name": "Lanparte V-Mount Battery Pinch",
"product_status": "active",
"product_type": null,
"retail_price": "0.0",
"sellable": true,
"sku": "VBP-01",
"status": "active",
"stock_on_hand": "1",
"supplier_code": "VBP-01",
"taxable": true,
"upc": null,
"weight": null,
"wholesale_price": "0.0",
"image_ids": [],
"variant_prices": [
{
"price_list_id": "buy",
"value": "124.0"
},
{
"price_list_id": "retail",
"value": "0.0"
},
{
"price_list_id": "wholesale",
"value": "0.0"
}
],
"locations": [
{
"location_id": 16377,
"stock_on_hand": "1",
"committed": null,
"incoming": "3",
"bin_location": null,
"reorder_point": 3
}
],
"prices": {
"buy": "124.0",
"retail": "0.0",
"wholesale": "0.0"
},
"stock_levels": {
"16377": "1.0"
},
"committed_stock_levels": {},
"incoming_stock_levels": {
"16377": "3.0"
}
}
],
"meta": {
"total": 1
}
}
Currently I using the following code with no luck
$url = "https://api.tradegecko.com/variants?sku=VBP-01";
$data = file_get_contents($url, false, $context);
$json = json_decode($data);
print $json->{'variant'}->{'sku'};
What I am doing wrong?

Answer 1

Just
echo $json->{'variants'}[0]->{'sku'};
In a loop
foreach ($json->variants as $variants) {
echo $variants->sku;
}