PHPMailer\PHPMailer\PHPMailer::doCallback PHP Method

    protected function doCallback($isSent, $to, $cc, $bcc, $subject, $body, $from)
    {
        if (!empty($this->action_function) and is_callable($this->action_function)) {
            call_user_func_array($this->action_function, [$isSent, $to, $cc, $bcc, $subject, $body, $from]);
        }
    }