php 来自 URL 的 JSON 解码
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JSON decoding from a URL
提问by Sebastian
I'm using an API which returns a JSON string:
我正在使用一个返回 JSON 字符串的 API：
http://api.geonames.org/findNearbyPlaceNameJSON?lat=51.9877644&lng=-1.47866&username=demo
http://api.geonames.org/findNearbyPlaceNameJSON?lat=51.9877644&lng=-1.47866&username=demo
The part I'm interested in is the city/town name (in this instance Hook Norton) which I'd like as a PHP variable. I understand the JSON_decode()function comes into play somewhere, but how do I access the output of the API?
我感兴趣的部分是我希望作为 PHP 变量的城市/城镇名称（在本例中为 Hook Norton）。我知道该JSON_decode()函数在某处发挥作用，但如何访问 API 的输出？
回答by Shashank Patel
Try this.
尝试这个。
$json = file_get_contents('http://api.geonames.org/findNearbyPlaceNameJSON?lat=51.9877644&lng=-1.47866&username=demo');
$data = json_decode($json,true);
$Geonames = $data['geonames'][0];
echo "<pre>";
print_r($Geonames);
exit;
回答by Ross
The simplest way is to use file_get_contents, which works on web documents as well as local files. For example:
最简单的方法是使用file_get_contents，它适用于 Web 文档和本地文件。例如：
$json = file_get_contents("http://api.geonames.org/findNearbyPlaceNameJSON?lat=51.9877644&lng=-1.47866&username=demo");
$data = json_decode($json);
echo $data->geonames[0]->toponymName;
回答by Jon
Since the JSON is part of the HTTP response, you need to make an HTTP request with PHP and get the response as a string.
由于 JSON 是 HTTP 响应的一部分，因此您需要使用 PHP 发出 HTTP 请求并将响应作为字符串获取。
The swiss knife for this is cURL, but (depending on your requirements and the server's PHP configuration) you are likely able to do this very simply like this:
瑞士刀是cURL，但是（取决于您的要求和服务器的 PHP 配置）您可能可以非常简单地执行此操作，如下所示：
$json = file_get_contents('http://api.geonames.org/findNearbyPlaceNameJSON?lat=51.9877644&lng=-1.47866&username=demo');
$data = json_decode($json);
// and now access the data you need
