sipadu_mbip/app/Exports/CompoundExport.php

<?php

namespace App\Exports;

use App\Compound;
use Maatwebsite\Excel\Concerns\FromCollection;
use Maatwebsite\Excel\Concerns\Exportable;
use Maatwebsite\Excel\Concerns\WithHeadings;
use Maatwebsite\Excel\Concerns\WithEvents;
use Maatwebsite\Excel\Events\AfterSheet;

class CompoundExport implements FromCollection, WithHeadings, WithEvents
{
	use Exportable;

	private $data, $jenis;

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

    /**
    * @return \Illuminate\Support\Collection
    */
    public function collection()
    {
        return collect($this->data);
    }

    public function headings(): array
    {
    	if($this->jenis == 'Pelbagai'){
    		return [
	            '#',
	            'Kpd',
	            'Jenis',
	            'Tarikh_Masa',
	            'Kesalahan',
	            'Nric',
	            'Nama',
	            'No_Daftar',
	            'Akaun_Lesen',
	            'No_Plate',
	            'Penguatkuasa',
	            'Status', 
                'Catatan_Dari_Admin',
                'Amaun_Bayaran',
                'Kemaskini_oleh',
                'Tarikh_kemaskini',
	        ];
    	}else if($this->jenis == 'Parkir'){
    		return [
	            '#',
                'Kpd',
                'Jenis',
                'Tarikh_Masa',
                'Kesalahan',
                'No_Plate',
                'Penguatkuasa',
                'Status',
                'Catatan_Dari_Admin',
                'Amaun_Bayaran',
                'Kemaskini_oleh',
                'Tarikh_kemaskini',
	        ];
    	}
    }

    public function registerEvents(): array
    {
        return [
            AfterSheet::class => function(AfterSheet $event) {
                $event->sheet->getStyle('A1:Z1')->applyFromArray([
                    'font' => [
                        'bold' => true
                    ]
                ]);
            },
        ];
    }
}