PHP使用json为何总是报错

$res = '{

"status": "ok", //接口状态，参考http://www.heweather.com/documents/api

"basic": { //基本信息
"city": "北京", //城市名称
"cnty": "中国", //国家
"id": "CN101010100", //城市ID，参见http://www.heweather.com/documents/cn-city-list
"lat": "39.904000", //城市维度
"lon": "116.391000", //城市经度
"update": { //更新时间
"loc": "2015-07-02 14:44", //当地时间
"utc": "2015-07-02 06:46" //UTC时间
}
}
}';

var_dump(json_decode($res)); //显示结果

// $json = '{"foo": 12345}';
// $obj = json_decode($json);
// print $obj->{'foo'}; // 12345
?>


抱的错都是类似syntax error, unexpected 'status' (T_STRING) in /Applications/MAMP/htdocs/testjson.php on line 5

回复讨论(解决方案)

你的代码就这些？那把json里面注释去掉。。。

你的代码就这些？那把json里面注释去掉。。。

好像去掉注释真的可以显示出来了，大概是这样的
object(stdClass)#1 (2)
{
["status"]=> string(2) "ok"
["basic"]=> object(stdClass)#2 (6)
{
["city"]=> string(6) "北京"
["cnty"]=> string(6) "中国"
["id"]=> string(11) "CN101010100"
["lat"]=> string(9) "39.904000"
["lon"]=> string(10) "116.391000"
["update"]=> object(stdClass)#3 (2)
{
["loc"]=> string(16) "2015-07-02 14:44"
["utc"]=> string(16) "2015-07-02 06:46"
}
}
}

排好版之后的样子，那比如说 $res = json_decode($res) 之后应该怎么提取这个数组里面的“id”的值呢

$obj->basic->id

json_decode($json, true);
出来的就是数组了

好像不行，这样没法提取单个数据值

当我从一个URL获取了json包之后，$res = curl_exec($ch); 不论怎么处理，整个json包都会展现出来，而不是我想要提取的其中某个字段

$ch = curl_init();
$url = 'https://api.heweather.com/x3/weather?cityid=CN101200101&key=7081f8010abe4638a86e0c4c1cfee30e';
// 执行HTTP请求
curl_setopt($ch , CURLOPT_URL , $url);
curl_setopt($ch , CURLOPT_SSL_VERIFYPEER , false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$res = json_decode(curl_exec($ch));
echo $res['now']['cond']['txt'];
?>

这段请求无法获取到需要的天气值

echo $res[key($res)][0]['now']['cond']['txt']; //多云

其实你 print_r($res); 就可以看到 now 是在第三维的

注释去掉即可

$res = '{    "status": "ok",                   "basic": {        "city": "北京",        "cnty": "中国",        "id": "CN101010100",        "lat": "39.904000",        "lon": "116.391000",        "update": {            "loc": "2015-07-02 14:44",            "utc": "2015-07-02 06:46"        }    }}';var_dump(json_decode($res));      //显示结果

object(stdClass)[1]
public 'status' => string 'ok' (length=2)
public 'basic' =>
object(stdClass)[2]
public 'city' => string '北京' (length=6)
public 'cnty' => string '中国' (length=6)
public 'id' => string 'CN101010100' (length=11)
public 'lat' => string '39.904000' (length=9)
public 'lon' => string '116.391000' (length=10)
public 'update' =>
object(stdClass)[3]
public 'loc' => string '2015-07-02 14:44' (length=16)
public 'utc' => string '2015-07-02 06:46' (length=16)


获取id可以这样写

$res = '{    "status": "ok",                   "basic": {        "city": "北京",        "cnty": "中国",        "id": "CN101010100",        "lat": "39.904000",        "lon": "116.391000",        "update": {            "loc": "2015-07-02 14:44",            "utc": "2015-07-02 06:46"        }    }}';$data = json_decode($res);      //显示结果echo $data->basic->id;

CN101010100

echo $res[key($res)][0]['now']['cond']['txt']; //多云

其实你 print_r($res); 就可以看到 now 是在第三维的

好像还是不行，刚才试了一下你这个，也不能输出任何东西

注释去掉即可

$res = '{    "status": "ok",                   "basic": {        "city": "北京",        "cnty": "中国",        "id": "CN101010100",        "lat": "39.904000",        "lon": "116.391000",        "update": {            "loc": "2015-07-02 14:44",            "utc": "2015-07-02 06:46"        }    }}';var_dump(json_decode($res));      //显示结果

object(stdClass)[1]
public 'status' => string 'ok' (length=2)
public 'basic' =>
object(stdClass)[2]
public 'city' => string '北京' (length=6)
public 'cnty' => string '中国' (length=6)
public 'id' => string 'CN101010100' (length=11)
public 'lat' => string '39.904000' (length=9)
public 'lon' => string '116.391000' (length=10)
public 'update' =>
object(stdClass)[3]
public 'loc' => string '2015-07-02 14:44' (length=16)
public 'utc' => string '2015-07-02 06:46' (length=16)


获取id可以这样写

$res = '{    "status": "ok",                   "basic": {        "city": "北京",        "cnty": "中国",        "id": "CN101010100",        "lat": "39.904000",        "lon": "116.391000",        "update": {            "loc": "2015-07-02 14:44",            "utc": "2015-07-02 06:46"        }    }}';$data = json_decode($res);      //显示结果echo $data->basic->id;

CN101010100

麻烦看一下我7楼的代码，从中如何提取天气的txt

$ch = curl_init();$url = 'https://api.heweather.com/x3/weather?cityid=CN101200101&key=7081f8010abe4638a86e0c4c1cfee30e';// 执行HTTP请求curl_setopt($ch , CURLOPT_URL , $url);curl_setopt($ch , CURLOPT_SSL_VERIFYPEER , false);curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);$res = json_decode(curl_exec($ch), true); //json_decode 要有第二个参数，这样可解析成数组echo $res[key($res)][0]['now']['cond']['txt'], PHP_EOL; //为什么要这样写，看看 print_r 的

输出就知道了print_r($res);