PHP迭代结果并按日期过滤

Question

我的json结果如下：

{
 "status": 200,
 "success": true,
 "data": [
   "Reports/2017/04/01/name.csv",
   "Reports/2017/05/16/name.csv",
   "Reports/2017/05/19/name.csv",
   "Reports/2017/06/20/name.csv",
   "Reports/2017/07/23/name.csv",
   "Reports/2017/07/26/name.csv",
   "Reports/2017/09/27/name.csv"
 ],
 "message": "Success"
}

这些是我的API结果，我有一个类型（每周或每月）变量。因此，当我按月传递我的类型值时，我的结果应该是

   "Reports/2017/04/01/name.csv",
   "Reports/2017/05/19/name.csv",
   "Reports/2017/06/20/name.csv",
   "Reports/2017/07/26/name.csv",
   "Reports/2017/09/27/name.csv"

我想拥有该月的最新csv文件，我不想在那个月拥有所有csv值。谁能建议我如何让这个工作？

以下是我的代码

   //comparing two dates and passing the dates for S3 bucket and i am saving all those values in array

     $begin = new DateTime("2017-01-17");
        $end = new DateTime("2017-09-28");
        $interval = DateInterval::createFromDateString('1 day');

        $period = new DatePeriod($begin, $interval, $end);

        $date = "2017-01-17";
        $type = "month" // now my type is month, so i want to get the latest entry of csv file for each month

        $all_objs = array();
           foreach ( $period as $dt )
        {

             $res_objs = $client->getIterator('ListObjects', array(

                                                         "Bucket" => $bucket,

                                                         "Prefix" => 'Reports/'.$date.'/name.csv'

                                                   ));
    //$res_objs stores all the csv files from csv
            foreach ($res_objs as $obj) {
    // here i am saving in array
                  array_push($all_objs, $obj['Key']);

               }

               $date = date ("Y/m/d", strtotime("+1 day", strtotime($date)));

           }
   // now, here i want to save those latest entries in a variable.
          return $all_objs;