siopas-istw-website/app/Exports/CustomerExport.php

<?php

namespace App\Exports;

use App\Models\Customer;
use Maatwebsite\Excel\Concerns\WithHeadings;
use Maatwebsite\Excel\Concerns\FromCollection;

class CustomerExport implements FromCollection, WithHeadings
{
    /**
     * @return \Illuminate\Support\Collection
     */
    public function collection()
    {
        // Ambil data dari model Peti
        $customers = Customer::select(
            'id',
            'name',
            'code_customer',
            'lot_no',
            'no_tlp',
            'address'
        )->get();

        // Inisialisasi nomor awal
        // $nomor = 1;

        // Modifikasi data dan tambahkan nomor
        $data = $customers->map(function ($customer) use (&$nomor) {
            return [
                'No' => $customer->id,
                'Nama Customer' => $customer->name,
                'Kode Customer' => $customer->code_customer,
                'Lot No' => $customer->lot_no,
                'No Telepon' => $customer->no_tlp,
                'Alamat' => $customer->address,
            ];
        });

        return $data;
    }

    public function headings(): array
    {
        return [
            'No',
            'NAMA CUSTOMER',
            'kODE CUSTOMER',
            'LOT NO',
            'NO TELEPONE',
            'ALAMAT',
        ];
    }
}