如何在CodeIgniter 4中发送带有pdf附件的电子邮件

use CodeIgniter\Email\Email;

public function sendEmailWithAttachment()
{
    $email = new Email();

    // 配置电子邮件参数
    $email->initialize([
        'protocol' => 'smtp',
        'SMTPHost' => 'your_smtp_host',
        'SMTPUser' => 'your_smtp_username',
        'SMTPPass' => 'your_smtp_password',
        'SMTPPort' => 587,
        'mailType' => 'html',
        'charset' => 'utf-8',
        'newline' => "\r\n"
    ]);

    // 设置发件人和收件人
    $email->setFrom('your_email@example.com', 'Your Name');
    $email->setTo('recipient@example.com');

    // 设置邮件主题和内容
    $email->setSubject('Email with PDF Attachment');
    $email->setMessage('Please find the attached PDF file.');

    // 附加PDF文件
    $pdfFilePath = '/path/to/your/pdf/file.pdf';
    $email->attach($pdfFilePath);

    // 发送邮件
    if ($email->send()) {
        echo 'Email sent successfully.';
    } else {
        echo 'Email sending failed.';
    }
}