使用Swiftmailer，我可以替换或删除消息部分吗？

Question

I'm using Swift Mailer to send mail to a fairly large list of email addresses. The message is customized slightly for each recipient. Some placeholders are replaced with unique text.

I assumed it would be more efficient (less garbage collection etc) to reuse one instance of Swift_Message multiple times. I just setTo(), setBody() and send again to the next address.

That works well with a single part body, usually just html. But ... when I want a second part, usually text, I can do addPart(), but next time around the loop, that will add another part, and then another part etc ... The problem doesn't happen with setBody because that overwrites the existing body.

Is there a way to overwrite or remove an existing part?

Thanks

Answer 1

According to the Swift Mailer Docs, there is no such method as a getBody() really.

I would suggest you to store the actual message template containing your placeholders in a variable and use setBody() on every iteration to replace the complete body of the message with the parsed template for the new recipient instead of trying to replace a tiny bit of it.

I reckon your code could look something like this:

$template = '<h1>Hello {{firstname}}</h1>, ...';
$recipients = [
    ['firstname' => 'John', 'email' => '[e-mail]'],
    ...
];
$message = Swift_Message::newInstance('Subject here');

foreach ($recipients as $recipient) {
    $body = str_replace('{{firstname}}', $recipient['firstname'], $template);
    $message->setBody($body, 'text/html');

    // continue building the mail object and send it ...
}

This way you could indeed re-use the Swift_Message instance for every mail. Although it wouldn't make any difference to PHP if you re-use the instance or create a new one in every loop iteration.