利用淘宝给定id，php编写抓取淘宝价格或其他信息

写出以下函数。

已知淘宝id的情况下

function getTBPrice($id){
$url="http://hws.m.taobao.com/cache/wdetail/5.0/?id=".$id;
$content=file_get_contents($url);
$content_ori=strip_tags($content);
$content_arr=json_decode($content_ori,true);
$pro_detail=json_decode($content_arr['data']['apiStack']['0']['value'],true);
$success_sym=$pro_detail['ret']['0'];//成功则返回"SUCCESS::调用成功";
if($success_sym=="SUCCESS::调用成功"){
$pro_price=$pro_detail['data']['itemInfoModel']['priceUnits']['0']['price'];
return $pro_price;
}else{
//return "<script type='text/javascript'>alert('宝贝不存在!');</script>";
return 0;
}
}

$pro_price=$pro_detail['data']['itemInfoModel']['priceUnits']['0']['price'];

$pro_sales=$pro_detail['data']['itemInfoModel']['totalSoldQuantity'];