php调用百度地图接口，根据经纬度获取城市

$url = "https://api.map.baidu.com/geocoder?location={$lon},{$lat}";
$ch = curl_init($url);
 curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
 $output = curl_exec($ch);
  curl_close($ch);
  $result = $this->XmlToArr($output);



  public function XmlToArr($xml)
    {
        if ($xml == '') return '';
        libxml_disable_entity_loader(true);
        $arr = json_decode(json_encode(simplexml_load_string($xml, 'SimpleXMLElement', LIBXML_NOCDATA)), true);
        return $arr;
    }