Kohana 3.2 + PHPExcel creates empty document when there are more than 31 rows written. - export-to-excel

Question

I'm trying to create a simple excel document that contains a 3-column list. (First Name, Last Name, Email Address)
When I output more than 31 rows, a blank excel file is created. Does anyone know how to fix it?
My code below:
$guests = ORM::factory('guest')
->order_by('last_name', 'ASC')
->find_all()
->as_array();
$columns = array('first_name', 'last_name', 'email');
$objPHPExcel = new PHPExcel();
$objPHPExcel->getProperties()
->setCreator('Me')
->setLastModifiedBy('Me)
->setTitle('Guest List')
->setSubject('Guest List')
->setDescription('Title of Report, run on ' . date('m/d/Y H:i:s'));
$objPHPExcel->createSheet(0);
$objPHPExcel->setActiveSheetIndex(0);
foreach($guests as $row => $guest) {
$source = array();
$column = 0;
$next_row = $objPHPExcel->getActiveSheet()->getHighestRow();
foreach($guest->as_array() as $column_name => $data) {
if(in_array($column_name, $columns)) {
$objPHPExcel->getActiveSheet()
->setCellValueByColumnAndRow($column, $next_row+1, $data);
$column++;
// unset($data);
}
}
}
$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$this->response->body($objWriter->save('php://output'));
$this->response->send_file(TRUE, 'GuestList.xls');

Answer 1

Kohana has a hard time handling the rendered file using the send_file() method, so write the file to disk using the built-in method from PHPExcel. Then use Kohana to deliver the saved file as a download.
$objWriter = new PHPExcel_Writer_Excel2007($objPHPExcel);
$objWriter->save($filename, 'EXCEL2007');
$this->response->send_file( DOCROOT.$filename );