PHPMailer\PHPMailer\SMTP::connected PHP Method

    public function connected()
    {
        if (is_resource($this->smtp_conn)) {
            $sock_status = stream_get_meta_data($this->smtp_conn);
            if ($sock_status['eof']) {
                // The socket is valid but we are not connected
                $this->edebug('SMTP NOTICE: EOF caught while checking if connected', self::DEBUG_CLIENT);
                $this->close();
                return false;
            }
            return true;
            // everything looks good
        }
        return false;
    }