<?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
    // $param字段为请求的参数
    function request_get($url = '', $param = array()) {
        if (empty($url) || empty($param)) {
            return false;
        }
        
        $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/traffic/v1/bound';
    
    // 构造请求参数
    $param['bounds']   = '39.912078,116.464303;39.918276,116.475442';
    $param['coord_type_input']   = 'gcj02';
    $param['coord_type_output']   = 'gcj02';
    $param['ak']   = $ak;

    $res = request_get($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, 
    "message": "成功", 
    "description": "该区域整体拥堵。京包高速：北向南,从开拓路5到京新高速拥堵。京新上地桥：北向南,京新上地桥拥堵。京新高速：北向南,从京包高速到耳通百安拥堵。小营西路：西向东,上地三街附近拥堵。", 
    "evaluation": {
        "status": 3, 
        "status_desc": "拥堵"
    }, 
    "road_traffic": [
        {
            "road_name": "UNKNOW"
        }, 
        {
            "road_name": "上地三街"
        }, 
        {
            "road_name": "上地三街辅路"
        }, 
        {
            "road_name": "上地东路"
        }, 
        {
            "road_name": "上地五街"
        }, 
        {
            "road_name": "上地六街"
        }, 
        {
            "road_name": "上地四街"
        }, 
        {
            "congestion_sections": [
                {
                    "congestion_distance": 1870, 
                    "speed": 8.45, 
                    "status": 3, 
                    "congestion_trend": "持平", 
                    "section_desc": "北向南,从开拓路5到京新高速", 
                }
            ], 
            "road_name": "京包高速"
        }, 
        {
            "congestion_sections": [
                {
                    "congestion_distance": 1610, 
                    "speed": 7.79, 
                    "status": 3, 
                    "congestion_trend": "持平", 
                    "section_desc": "北向南,京新上地桥", 
                }
            ], 
            "road_name": "京新上地桥"
        }, 
        {
            "congestion_sections": [
                {
                    "congestion_distance": 1870, 
                    "speed": 8.45, 
                    "status": 3, 
                    "congestion_trend": "持平", 
                    "section_desc": "北向南,从京包高速到耳通百安", 
                }
            ], 
            "road_name": "京新高速"
        }, 
        {
            "road_name": "信息路"
        }, 
        {
            "road_name": "创业路"
        }, 
        {
            "road_name": "安宁庄西一条"
        }, 
        {
            "road_name": "安宁庄西三条"
        }, 
        {
            "road_name": "安宁庄西二条"
        }, 
        {
            "road_name": "安宁庄路"
        }, 
        {
            "congestion_sections": [
                {
                    "congestion_distance": 760, 
                    "speed": 6.39, 
                    "status": 3, 
                    "congestion_trend": "加重", 
                    "section_desc": "西向东,上地三街附近", 
                }
            ], 
            "road_name": "小营西路"
        }, 
        {
            "road_name": "小营西路辅路"
        }, 
        {
            "road_name": "开拓路"
        }
    ]
  }