How to convert CSV file into Excel? - php

Question

I want to export data from the database into an Excel file, then send it directly to an email using phpmailer without saving it to my computer first.
I have done it successfully, but all I can get is the CSV file, whereas I want the Excel file, so is there any way to make the CSV into xlsx?
public function SendEmail() {
$mail = new PHPMailer(true);
try {
$filename = "hoursandpay.csv";
header('HTTP/1.1 200 OK');
header('Content-Type: text/csv; charset=utf-8');
header('Content-Disposition: attachment; filename=$filename');
header('Cache-Control: no-cache, no-store, must-revalidate');
header('Pragma: no-cache');
header('Expires: 0');
$output = fopen($filename, 'w');
fputcsv($output, array('Nik', 'Nama', 'Line', 'Absen'));
$koneksi = mysqli_connect("host", "user", "pass", "database");
$data = mysqli_query($koneksi, "query");
while ($row = mysqli_fetch_assoc($data)) {
fputcsv($output, $row);
}
//Server settings
$mail->isSMTP();
$mail->Host = 'smtp.gmail.com';
$mail->SMTPAuth = true;
$mail->Username = 'user#gmail.com';
$mail->Password = 'password';
$mail->SMTPOptions = array(
'ssl' => array(
'verify_peer' => false,
'verify_peer_name' => false,
'allow_self_signed' => true
)
);
$mail->SMTPSecure = 'ssl';
$mail->Port = 465;
//Send Email
$mail->setFrom('from#gmail.com');
//Recipients
$mail->addAddress('to#gmail.com');
$mail->addAddress('to2#gmail.com');
$mail->addAddress('to3#gmail.com');
$datetime = new DateTime("now", new DateTimeZone("Asia/Jakarta"));
$today = $datetime->format('Y-m-d H:i:s');
//Content
$mail->isHTML(true);
$mail->Subject = 'LAPORAN EMAIL TANGGAL ' . $today;
$mail->Body = 'ABSENSI';
$mail->addAttachment($filename);
$mail->send();
unlink($filename);
fclose($output);
echo $this->session->set_flashdata('sukses', 'Kirim email sukses');
} catch (Exception $ee){
echo $this->session->set_flashdata('message', $ee->getMessage());
}
redirect(base_url());
}
Or is there a way to export from database to Excel and then send it directly to email without saving it first? Because all I can get is with the vsc file