$from_name = 'МЕТРОТАЙЛ';
$subject_name = 'Заявка на расчет #0';

require(__DIR__ .'/PHPMailer.php');
$mail = new PHPMailerPHPMailerPHPMailer();
try {
$mail->charSet = 'UTF-8';
$mail->setFrom('info@test.com', $from_name);
$mail->addAddress('info@test.com');
if ($_POST['customEmail']) {
$mail->addAddress($customEmail);
};
$mail->Subject = $subject_name.''.$next_id;
for ($ct = 0; $ct < count($_FILES['userfile']['tmp_name']); $ct++) {
    $uploadfile = tempnam(sys_get_temp_dir(), sha1($_FILES['userfile']['name'][$ct]));
    $filename = $_FILES['userfile']['name'][$ct];
    if (move_uploaded_file($_FILES['userfile']['tmp_name'][$ct], $uploadfile)) {
        $mail->addStringAttachment($uploadfile, $filename);
    } else {
        $msg .= 'Failed to move file to ' . $uploadfile;
    }
}
$mail->msgHTML('Файлы во вложении');


$mail->send();
} catch (Exception $e) {
    echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}

$from_name = 'МЕТРОТАЙЛ';
$subject_name = 'Заявка на расчет #0';

require(__DIR__ .'/PHPMailer.php');
$mail = new PHPMailerPHPMailerPHPMailer();
try {
$mail->charSet = 'UTF-8';
$mail->setFrom('info@test.com', '=?UTF-8?B?'.base64_encode($from_name).'?=');
$mail->addAddress('info@test.com');
if ($_POST['customEmail']) {
$mail->addAddress($customEmail);
};
$mail->Subject =  '=?UTF-8?B?'.base64_encode($subject_name.''.$next_id).'?=';

for ($ct = 0; $ct < count($_FILES['userfile']['tmp_name']); $ct++) {
    $uploadfile = tempnam(sys_get_temp_dir(), sha1($_FILES['userfile']['name'][$ct]));
    $filename = $_FILES['userfile']['name'][$ct];
    if (move_uploaded_file($_FILES['userfile']['tmp_name'][$ct], $uploadfile)) {
        $mail->addAttachment($uploadfile, '=?UTF-8?B?'.base64_encode($filename).'?=');
    } else {
        $msg .= 'Failed to move file to ' . $uploadfile;
    }
}
$mail->msgHTML('Файлы во вложении');

$mail->send();
} catch (Exception $e) {
    echo 'Message could not be sent. Mailer Error: ', $mail->ErrorInfo;
}