Show data from database (Export form) with phpoffice/spreadsheet MVC framework

I want to export data from database with phpoffice/spreadsheet but the looping didn't work. I use MVC framework.

my controller

$data['trx_registration'] = $this->m_regreport->get_report_reg1($loc); //       
$this->template->set('title', 'Kyoai | Registration Report');
$this->template->load('template', 'menu/reg_reportnew', $data);

my view

$sheet->setCellValue('A7', 'No');
$sheet->setCellValue('B7', 'ID Registration');
$sheet->setCellValue('C7', 'Patient Name');
$sheet->setCellValue('D7', 'Birthdate');
$sheet->setCellValue('E7', 'Company Name');
$sheet->setCellValue('F7', 'Type');

$s1 =  1;
$start =  8;
foreach ($trx_registration as $cius) {
    $sheet->setCellValue('A' . $start, $s1);
    $sheet->setCellValue('A' . $start, $cius->id_reg);

    $start = $start + 1;
    $s1 = $s1 + 1;
}

source https://stackoverflow.com/questions/67887959/show-data-from-database-export-form-with-phpoffice-spreadsheet-mvc-framework