use PhpOffice\PhpSpreadsheet\Spreadsheet;
use PhpOffice\PhpSpreadsheet\Writer\Xlsx;

class DownloadExcel
{
    public static function createExcel(array $data, array $headers = [],
                                       $fileName = 'data.xlsx')
    {
        $spreadsheet = new Spreadsheet();
        $sheet = $spreadsheet->getActiveSheet();

        for ($i = 0, $l = sizeof($headers); $i < $l; $i++) {
            $sheet->setCellValueByColumnAndRow($i + 1, 1, $headers[$i]);
        }

        for ($i = 0, $l = sizeof($data); $i < $l; $i++) { // row $i
            $j = 0;
            foreach ($data[$i] as $k => $v) { // column $j
                $sheet->setCellValueByColumnAndRow($j + 1, ($i + 1 + 1), $v);
                $j++;
            }
        }

        $writer = new Xlsx($spreadsheet);
        header('Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
        header('Content-Disposition: attachment; filename="'. urlencode($fileName).'"');
        $writer->save('php://output');
    }

}