数组里面的对象怎么获取

首先，我得到的是一个string：

{"status":"0","t":"","set_cache_time":"","data":[{"ExtendedLocation":"","OriginQuery":"113.219.202.173","appinfo":"","disp_type":0,"fetchkey":"113.219.202.173","location":"湖南省 电信","origip":"113.219.202.173","origipquery":"113.219.202.173","resourceid":"6006","role_id":0,"shareImage":1,"showLikeShare":1,"showlamp":"1","titlecont":"IP地址查询","tplt":"ip"}]}

然后我json_decode($res->body())一下，得到：

{
    "status": "0",
    "t": "",
    "set_cache_time": "",
    "data": [
        {
            "ExtendedLocation": "",
            "OriginQuery": "113.219.202.173",
            "appinfo": "",
            "disp_type": 0,
            "fetchkey": "113.219.202.173",
            "location": "湖南省 电信",
            "origip": "113.219.202.173",
            "origipquery": "113.219.202.173",
            "resourceid": "6006",
            "role_id": 0,
            "shareImage": 1,
            "showLikeShare": 1,
            "showlamp": "1",
            "titlecont": "IP地址查询",
            "tplt": "ip"
        }
    ]
}

然后我json_decode($res->body())->data一下，得到：

[
    {
        "ExtendedLocation": "",
        "OriginQuery": "39.144.145.92",
        "appinfo": "",
        "disp_type": 0,
        "fetchkey": "39.144.145.92",
        "location": "中国 移动",
        "origip": "39.144.145.92",
        "origipquery": "39.144.145.92",
        "resourceid": "6006",
        "role_id": 0,
        "shareImage": 1,
        "showLikeShare": 1,
        "showlamp": "1",
        "titlecont": "IP地址查询",
        "tplt": "ip"
    }
]

最后我只想要location，但是，无论我怎么写都不对

我写json_decode($res->body())->data[0]：
报错：

Undefined array key 0

我写json_decode($res->body())->data->location：
报错：

Attempt to read property "location" on array

所以我到底要写啥？不就是数组里的对象吗？

补充一下代码：

$grid->column('ip_address','ip地址')->display(function($v){

$res =  Http::get('http://opendata.baidu.com/api.php?query='  .  $v.  '&co=&resource_id=6006&oe=utf8');

$location =  json_decode($res->body())->data;

return  $location;

});