如何从json编码结果中获取id字段

I've this as a result from calling a function :

 json_encode(searchpage)

Result :

[{"category":"Hospital\/clinic","name":"\u05d1\u05d9\u05ea \u05d0\u05d1\u05d5\u05ea \u05e9\u05dc\u05de\u05d4 \u05d4\u05de\u05dc\u05da","id":"249739158463596"}]

how do i get to the id filed ?!

 var temp = [{ "category": "Hospital\/clinic", "name": "\u05d1\u05d9\u05ea \u05d0\u05d1\u05d5\u05ea \u05e9\u05dc\u05de\u05d4 \u05d4\u05de\u05dc\u05da", "id": "249739158463596" }];
                alert(temp[0].id);