<?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 post请求，并返回请求的结果
    // $url字段为请求的地址
    // $param字段为请求的参数
    function request_post($url = '', $param = array()) {
        if (empty($url) || empty($param)) {
            return false;
        }

        $curl = curl_init(); // 初始化curl
        curl_setopt($curl, CURLOPT_URL, $url); // 设置指定url
        curl_setopt($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

        // 以下两行不对https做证书及服务器校验，真实项目中请根据实际情况调整。
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, 0);
        curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, 0);

        curl_setopt($curl, CURLOPT_POST, 1); // 设置POST
        curl_setopt($curl, CURLOPT_POSTFIELDS, $param);
        $data = curl_exec($curl); // 运行curl

        if (!$data) {
            print("an error occured in function request_post(): " . curl_error($curl) . "\n");
        }

        curl_close($curl);

        return $data;
    }

    // 请求地址
    $url = 'https://api.map.baidu.com/api_trackanalysis/v1/roadgrade';

    // 构造请求
    $param['ak'] = $ak;
    $param['point_list'] = '['.
            '{"latitude":39.22682,"coord_type_input":"gcj02","longitude":117.283027,"loc_time":1632817534},'.
            '{"latitude":39.223979,"coord_type_input":"gcj02","longitude":117.285641,"loc_time":1632817592},'.
            '{"latitude":39.220022,"coord_type_input":"gcj02","longitude":117.285826,"loc_time":1632817652},'.
            '{"latitude":39.213075,"coord_type_input":"gcj02","longitude":117.281162,"loc_time":1632817712},'.
            '{"latitude":39.207602,"coord_type_input":"gcj02","longitude":117.270462,"loc_time":1632817773}'.
        ']';
    $param['rectify_option'] = 'transport_mode:auto|denoise_grade:1|vacuate_grade:1';


    // 只支持x-www-form-urlencoded格式的请求
    $param = http_build_query($param);

    // 发送请求
    $res = request_post($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,
    "message": "成功",
    "total":19,
    "distance":2982.47,
    "road_grade_info":[
       {
             "road_grade":"其它道路",
             "distance":243.99
        },
       {
             "road_grade":"县道",
             "distance":455.08
       },
       {
             "road_grade":"高速道路",
             "distance":2283.39
      } 
   ]
}