php – 如何使用fb api计算估计的每日覆盖率

我试过下面的代码： –

$ch = curl_init();
   curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,10);
   curl_setopt($ch,CURLOPT_TIMEOUT,60);
   curl_setopt($ch,CURLOPT_RETURNTRANSFER,TRUE);
   curl_setopt($ch,CURLOPT_USERAGENT,'facebook');

$url_en = urlencode("{'geo_locations':{'countries': ['US'],},'age_min':20,'age_max':24}");


   curl_setopt($ch,CURLOPT_URL,"https://graph.facebook.com/v2.2/act_1375199556085956/reachestimate?access_token=ACCESS TOKEN&targeting_spec=".$url_en);

   curl_setopt($ch,CURLOPT_SSL_VERIFYPEER,0);
   curl_setopt($ch,CURLOPT_SSL_VERIFYHOST,2);
   curl_setopt($ch,CURLOPT_FOLLOWLOCATION,1);
   curl_setopt($ch,CURLOPT_HEADER,0);
   //curl_setopt($ch,1);

   $data = curl_exec($ch);

但获得以下响应数据： –

"data": {
      "users": 14600000,"bid_estimations": [
         {
            "unsupported": false,"location": 3,"cpa_min": 79,"cpa_median": 145,"cpa_max": 195,"cpc_min": 45,"cpc_median": 70,"cpc_max": 87,"cpm_min": 8,"cpm_median": 20,"cpm_max": 27
         }
      ],"estimate_ready": true
   }
}

但是,我想要的结果如下：

请帮我解决一下这个.