php两个多维数组组合遍历的实例

实例如下：

$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'];
  }
 }

导出表格单独查询，在写入excel时单独查询遍历