workHour/app/Exports/ResearchExpenseSummaryMultipleSheetExport.php

<?php

namespace App\Exports;

use Maatwebsite\Excel\Concerns\WithMultipleSheets;

class ResearchExpenseSummaryMultipleSheetExport implements WithMultipleSheets
{
    protected $data; // 格式: ['2026' => [ 'items' => [...], 'summary' => [...] ], '2025' => [...] ]

    public function __construct(array $data)
    {
        $this->data = $data;
    }

    public function sheets(): array
    {
        $sheets = [];
        foreach ($this->data as $year => $payload) {
            $sheets[] = new ResearchExpenseSummarySheetExport($year, $payload);
        }
        return $sheets;
    }
}