Разборать масив json

Есть json:

[{"product_id":"1779","name":"\u0421\u0435\u0442\u0435\u0432\u043e\u0435 \u0437\u0430\u0440\u044f\u0434\u043d\u043e\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e AR-003 \u043a\u0443\u0431\u0438\u043a \u0431\u0435\u043b\u044b\u0439","model":"008333440","option":[],"quantity":"1","price":"290 \u0440.","total":"290 \u0440.","href":"url"},{"product_id":"1809","name":"\u041a\u0430\u0431\u0435\u043b\u044c \u0434\u043b\u044f iPhone 5\/6 Remax LESU RC-050i 1m \u0427\u0435\u0440\u043d\u044b\u0439","model":"\u0423\u0422-00000864","option":[],"quantity":"1","price":"490 \u0440.","total":"490 \u0440.","href":"url"}]

Я данный json декодирую

$json ='[{"product_id":"1779","name":"\u0421\u0435\u0442\u0435\u0432\u043e\u0435 \u0437\u0430\u0440\u044f\u0434\u043d\u043e\u0435 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u043e AR-003 \u043a\u0443\u0431\u0438\u043a \u0431\u0435\u043b\u044b\u0439","model":"008333440","option":[],"quantity":"1","price":"290 \u0440.","total":"290 \u0440.","href":"url"},{"product_id":"1809","name":"\u041a\u0430\u0431\u0435\u043b\u044c \u0434\u043b\u044f iPhone 5\/6 Remax LESU RC-050i 1m \u0427\u0435\u0440\u043d\u044b\u0439","model":"\u0423\u0422-00000864","option":[],"quantity":"1","price":"490 \u0440.","total":"490 \u0440.","href":"url"}]';
$json = substr($json, 1, -1);
$obj = json_decode($json);
$json = substr($json, 1, -1);
$obj = json_decode($json);
print $obj->{'name'}; // 12345

Но у меня их два в массиве, как разобрать на части что бы например продукт было 1779, 1809 ?