PHP将二维数组某一个字段相同的数组合并

· 参考 https://www.jb51.net/article/80074.htm

      $final = [];
        if ($query){
            foreach ($query as &$val){
                $val['created_time'] = date('Y-m-d',$val['created_time']);
                $final[$val['created_time']][] = $val;
            }
        }