public function __construct()
{
parent::__construct();
$this->content_type = "application/vnd.ms-excel";
$this->extension = "xls";
$this->c = 0;
$this->r = 0;
$this->output();
}
public function __construct()
{
parent::__construct();
$this->content_type = "text/csv";
$this->extension = "csv";
$this->output();
}