如何在laravel中以maatwebsite/excel 3.1导出时动态标题

如何动态标题功能，如下所示

class ExportPrescriptionReports implements FromCollection, WithHeadings
{

    protected $names; 

    protected $start_date;

    protected $end_date;

    protected $names_count;

    public function __construct(array $names, $start_date, $end_date)
    {

        $this->names = $names;

        $this->start_date = $start_date; 

        $this->end_date = $end_date;

        $this->names_count = count($names);
    }


    public function collection()
    {
        if($this->names_count == 2){

          $name = $this->names[0];

          $name1 = $this->names[1];

          return Rsm_Prescription::select($name, $name1)
               ->where([
                   ['start_data_time', $this->start_date],
                   ['end_data_time', $this->end_date],
               ])->get();
        }
    }

    public function headings(): array
    {

    return [
            'SL No',
            'Total Rx',
            'Total Target Rx',
        ];
    }
}

是否可以在laravel的maatwebsite excel包中使用？请任何人帮助我

---

你好。把代码放在

`

和image之间。qrabno-你知道任何解决方案。不，可能不知道。这个问题太糟糕了。最好的办法是你给我举一个完整的例子，让我自己试试！因此，对于输入、编译命令、输出、错误堆栈跟踪等，qrabno-我已经做到了，感谢您的响应

public function headings(): array

{

  return [

         $sl_no=0,

         foreach($this->names as $name){

             echo $sl_no;

             echo $name;

             $sl_no++;

          }

       ]

  }