【CodeBase】通过层级键在多维数组中获取目标值

通过层级键在多维数组中获取目标值

 /*
 *Author : @YunGaZeon
 *Date : 2017.08.09
 *param data : Data Array
 *param keys : Key level Array
 *return : Array
 */
 function findbykeys($data,$keys,$_index=0,&$_target_arr=[])
 {
     if($_index>(count($keys)-1))
         return $_target_arr;

     foreach($data as $k=>$v)
     {
         if($k===$keys[$_index])
         {
             if($_index==(count($keys)-1))
                 $_target_arr[]=$v;
             else
             {
                 if(is_array($v))
                     findbykeys($v,$keys,++$_index,$_target_arr);
             }
         }
         else
         {
             if(is_array($v))
                 findbykeys($v,$keys,$_index,$_target_arr);
         }
     }
     return $_target_arr;
 }

使用：获取京东某页评价中的所有图片链接

 $data=file_get_contents('https://club.jd.com/comment/productPageComments.action?callback=fetchJSON_comment&productId=5045080&score=0&sortType=5&page=1&pageSize=10&isShadowSku=0&rid=0&fold=1');
 $data=iconv('GBK', 'UTF-8//TRANSLIT//IGNORE', $data);
 preg_match('/^[^\(]+\(([\s\S]+)\);$/',$data,$data);
 $data=$data[1];
 $cm=json_decode($data,true);
 $keys=['comments','images','imgUrl'];
 var_dump(findbykeys($cm,$keys));