Add an attachment to an email with Zend_Form

mail_attachment.php

<?php

$mail = new Zend_Mail();

$mail->setFrom('me@gmail.com', 'Me')
     ->addTo($to)
     ->setSubject($subject)
     ->setBodyText($message);

$file = '/path/to/a/file';
$at = new Zend_Mime_Part(file_get_contents($file));
$at->filename = basename($file);
$at->disposition = Zend_Mime::DISPOSITION_ATTACHMENT;
$at->encoding = Zend_Mime::ENCODING_8BIT;
        
$mail->addAttachment($at);
$mail->send();