PHP two multidimensional array combination case

The following editor will bring you an example of combined traversal of two multi-dimensional arrays in PHP. Let me share it with you now and give it as a reference for everyone.

The example is as follows:

$res = $this->LoanRecord->searchloan($conditions,$columns,$page,$this->num,$user_id);
 foreach ($res[1] as $key => $value) {
  if(!empty($value['b']['id'])){
   $result_day = $this->LoanRecord ->getLastDay($value['b']['id']);
   $res[1][$key]['m'] = $result_day['m'];
  }
 }

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