mybb-digest/digest.php

<?php
require_once "vendor/autoload.php";
require_once "activethreads.php";
require_once "email.php";
define("MYBB_ROOT", "../");
define("MYBB_PREFIX", "mybbfo_");
define("FORUM_ID", 0);// 0 means all forums
$dsn = 'mysql:host=localhost;dbname=mybb;charset=utf8';
$usr = 'root';
$pwd = '123456';

$pdo = new PDO($dsn, $usr, $pwd);
$threads = getLatestActiveThreads(FORUM_ID, 100, true);
$users = $pdo->prepare("SELECT email, username FROM ".MYBB_PREFIX."users
WHERE usergroup = 4
AND isSubscribed = 1");
$users->execute();
$users = $users->fetchAll();

$url = $pdo->prepare("SELECT value FROM ".MYBB_PREFIX."settings WHERE name = 'bburl'");
$url->execute();
$url = $url->fetch()['value'];

$tmp = $pdo->prepare("SELECT name, value FROM ".MYBB_PREFIX."settings WHERE name LIKE 'smtp_%'");
$tmp->execute();
$tmp = $tmp->fetchAll();
$smtp = [];
foreach ($tmp as $row) {
  $smtp[$row['name']] = $row['value'];
}
unset($tmp);
$transport = Swift_SmtpTransport::newInstance($smtp['smtp_host'], $smtp['smtp_port'])
  ->setUsername($smtp['smtp_user'])
  ->setPassword($smtp['smtp_pass']);
$mailer = Swift_Mailer::newInstance($transport);

foreach ($users as $user) {
  $email = $user['email'];
  $message = print_email($user['username'], $url.'/unsubscribe', $threads);
  $message = Swift_Message::newInstance()
    ->setSubject('Daily digest')
    ->setFrom(array('john@doe.com' => 'John Doe'))
    ->setTo(array($email => $user['username']))
    ->setBody($message, 'text/html');
  $mailer->send($message);
}