workHour/app/Exports/ProjectDepreciationMultipleSheetExport.php

<?php

namespace App\Exports;

use Maatwebsite\Excel\Concerns\WithMultipleSheets;

class ProjectDepreciationMultipleSheetExport implements WithMultipleSheets
{
    protected $data; // 格式：[ '2025-RD01' => [ 'project_name' => '...', 'months' => [ 1 => [...数据...], 2 => [...] ] ] ]

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

    public function sheets(): array
    {
        $sheets = [];
        foreach ($this->data as $groupKey => $payload) {
            // $groupKey 比如 "2025-RD01"
            $sheets[] = new ProjectDepreciationSheetExport(
                $groupKey,
                $payload['project_name'],
                $payload['months']
            );
        }
        return $sheets;
    }
}