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<?php 
// 此处填写你在控制台-应用管理-创建应用后获取的ak
    $ak ='您的ak';
// 发起一个http get请求，并返回请求的结果
// $url字段为请求的地址
// $param字段为请求的参数
functionrequest_get($url ='', $param =array()){
if(empty($url)||empty($param)){
returnfalse;
}
        $geturl = $url ."?".http_build_query($param);
        $curl =curl_init();// 初始化curl
curl_setopt($curl,curlopt_ssl_verifypeer,false);// 跳过证书检查   
curl_setopt($curl,curlopt_ssl_verifyhost,2);// 从证书中检查ssl加密算法是否存在
curl_setopt($curl,curlopt_url, $geturl);// 抓取指定网页
curl_setopt($curl,curlopt_timeout,1000);// 设置超时时间1秒
curl_setopt($curl,curlopt_returntransfer,1);// curl不直接输出到屏幕
curl_setopt($curl,curlopt_header,0);// 设置header
        $data =curl_exec($curl);// 运行curl
if(!$data){
print("an error occured in function request_get(): ".curl_error($curl)."\n");
}
curl_close($curl);
return $data;
}
// 请求地址
    $url ='https://api.map.baidu.com/reverse_geocoding/v3';
// 构造请求参数
    $param['ak']= $ak;
    $param['output']='json';
    $param['coordtype']='wgs84ll';
    $param['location']='31.225696563611,121.49884033194';
    $res =request_get($url, $param);
// 将原始返回的结果打印出来
print("请求的原始返回结果为:\n");
print($res ."\n");
?>

{
"status":0,
"result":{
"location":{
"lng":121.50989077799083,
"lat":31.22932842411674
},
"formatted_address":"上海市黄浦区中山南路187",
"edz":{
"name":""
},
"business":"外滩,陆家嘴,董家渡",
"addresscomponent":{
"country":"中国",
"country_code":0,
"country_code_iso":"chn",
"country_code_iso2":"cn",
"province":"上海市",
"city":"上海市",
"city_level":2,
"district":"黄浦区",
"town":"小东门街道",
"town_code":"310101017",
"distance":"91",
"direction":"东北",
"adcode":"310101",
"street":"中山南路",
"street_number":"187"
},
"pois":[],
"roads":[],
"poiregions":[],
"sematic_description":"",
"formatted_address_poi":"",
"citycode":289
}
}