如何在php中创建临时文件以通过电子邮件发送它们？

$file = tmpfile();

$contents = "这是要发送的内容";
fwrite($file, $contents);

rewind($file);

$contents = fread($file, filesize($file));

// 使用PHPMailer示例代码
require 'phpmailer/PHPMailerAutoload.php';

$mail = new PHPMailer;
$mail->setFrom('sender@example.com', '发件人名称');
$mail->addAddress('recipient@example.com', '收件人名称');
$mail->addAttachment($file, '临时文件名');
$mail->Subject = '附件邮件';
$mail->Body = '这是一封带有附件的邮件。';

if (!$mail->send()) {
    echo '邮件发送失败：' . $mail->ErrorInfo;
} else {
    echo '邮件发送成功！';
}

// 使用SwiftMailer示例代码
require 'swiftmailer/autoload.php';

$transport = new Swift_SmtpTransport('smtp.example.com', 587, 'tls');
$transport->setUsername('your_username');
$transport->setPassword('your_password');

$mailer = new Swift_Mailer($transport);

$message = new Swift_Message('附件邮件');
$message->setFrom(['sender@example.com' => '发件人名称']);
$message->setTo(['recipient@example.com' => '收件人名称']);
$message->setBody('这是一封带有附件的邮件。');
$message->attach(Swift_Attachment::fromPath($file)->setFilename('临时文件名'));

$result = $mailer->send($message);
if ($result) {
    echo '邮件发送成功！';
} else {
    echo '邮件发送失败。';
}