/**
* Get mailer instance, enable buffering, flush buffer or disable buffering.
*
* @param string $action 'get', 'buffer', 'close' or 'flush'
* @return moodle_phpmailer|null mailer instance if 'get' used or nothing
*/
function get_mailer($action = 'get')
{
global $CFG;
/** @var moodle_phpmailer $mailer */
static $mailer = null;
static $counter = 0;
if (!isset($CFG->smtpmaxbulk)) {
$CFG->smtpmaxbulk = 1;
}
if ($action == 'get') {
$prevkeepalive = false;
if (isset($mailer) and $mailer->Mailer == 'smtp') {
if ($counter < $CFG->smtpmaxbulk and !$mailer->isError()) {
$counter++;
// Reset the mailer.
$mailer->Priority = 3;
$mailer->CharSet = 'UTF-8';
// Our default.
$mailer->ContentType = "text/plain";
$mailer->Encoding = "8bit";
$mailer->From = "root@localhost";
$mailer->FromName = "Root User";
$mailer->Sender = "";
$mailer->Subject = "";
$mailer->Body = "";
$mailer->AltBody = "";
$mailer->ConfirmReadingTo = "";
$mailer->clearAllRecipients();
$mailer->clearReplyTos();
$mailer->clearAttachments();
$mailer->clearCustomHeaders();
return $mailer;
}
$prevkeepalive = $mailer->SMTPKeepAlive;
get_mailer('flush');
}
require_once $CFG->libdir . '/phpmailer/moodle_phpmailer.php';
$mailer = new moodle_phpmailer();
$counter = 1;
if ($CFG->smtphosts == 'qmail') {
// Use Qmail system.
$mailer->isQmail();
} else {
if (empty($CFG->smtphosts)) {
// Use PHP mail() = sendmail.
$mailer->isMail();
} else {
// Use SMTP directly.
$mailer->isSMTP();
if (!empty($CFG->debugsmtp)) {
$mailer->SMTPDebug = true;
}
// Specify main and backup servers.
$mailer->Host = $CFG->smtphosts;
// Specify secure connection protocol.
$mailer->SMTPSecure = $CFG->smtpsecure;
// Use previous keepalive.
$mailer->SMTPKeepAlive = $prevkeepalive;
if ($CFG->smtpuser) {
// Use SMTP authentication.
$mailer->SMTPAuth = true;
$mailer->Username = $CFG->smtpuser;
$mailer->Password = $CFG->smtppass;
}
}
}
return $mailer;
}
$nothing = null;
// Keep smtp session open after sending.
if ($action == 'buffer') {
if (!empty($CFG->smtpmaxbulk)) {
get_mailer('flush');
$m = get_mailer();
if ($m->Mailer == 'smtp') {
$m->SMTPKeepAlive = true;
}
}
return $nothing;
}
// Close smtp session, but continue buffering.
if ($action == 'flush') {
if (isset($mailer) and $mailer->Mailer == 'smtp') {
if (!empty($mailer->SMTPDebug)) {
echo '<pre>' . "\n";
}
$mailer->SmtpClose();
if (!empty($mailer->SMTPDebug)) {
echo '</pre>';
}
}
return $nothing;
}
// Close smtp session, do not buffer anymore.
if ($action == 'close') {
if (isset($mailer) and $mailer->Mailer == 'smtp') {
get_mailer('flush');
$mailer->SMTPKeepAlive = false;
}
$mailer = null;
// Better force new instance.
return $nothing;
}
}