php怎么能让第二个数组的格式变成第一个数组的格式？

已解决：

 $data = array();
 $res = array();
 foreach($request['a'] as $k=>$v){
         $data[]['questions']=$v;
         $res[]['p_id'] = $pid;
 }
  $a3_keys=array_keys($data+$res);
 // print_r($a3_keys); die;
  $a3=array();
  foreach($a3_keys as $key)
  {
  $a3[$key]=$data[$key]+$res[$key];
  }
  print_r($a3); die;