yf_email_page class

    public function go($text = '')
    {
        $cur_page_md5 = md5(($_GET['object'] ?? null) . '%%' . ($_GET['action'] ?? null) . '%%' . ($_GET['id'] ?? null));
        // Verify and send email
        if ( ! empty($_POST['go'])) {
            // Check if email is already registered for someone
            if ( ! common()->email_verify($_POST['email'] ?? null)) {
                _re('Invalid e-mail, please check your spelling!');
            }
            if (empty($_POST['name'])) {
                _re('Friend name required!');
            }
            if (empty($_POST['message'])) {
                _re('Message text required!');
            }
            // Check for flood
            if ( ! empty($_SESSION[$this->SESSION_TTL_NAME][$cur_page_md5]) && ($_SESSION[$this->SESSION_TTL_NAME][$cur_page_md5] ?? null) > (time() - $this->TTL)) {
                _re('You are not allowed to send current page more than once in future ' . (($_SESSION[$this->SESSION_TTL_NAME][$cur_page_md5] ?? null) + $this->TTL - time()) . ' seconds!');
            }
            // Try to send email
            if ( ! common()->_error_exists()) {
                $subject = 'Your friend ' . ($_POST['name'] ?? null) . ' sent to you from ' . SITE_NAME;
                $text_to_send = ( ! empty($_POST['comment']) ? ($_POST['comment'] ?? null) . "<br />\r\n<br />\r\n" : '') . ($_POST['message'] ?? null);
                $send_result = common()->quick_send_mail(($_POST['email'] ?? null), $subject, $text_to_send);
                // Anti-flooder
                $_SESSION[$this->SESSION_TTL_NAME][$cur_page_md5] = time();
                $replace2 = [
                    'result' => (int) ((bool) $send_result),
                ];
                return tpl()->parse('system/common/email_page_result', $replace2);
            }
        }
        // Show form
        if (empty($_POST['go']) || common()->_error_exists()) {
            $replace = [
                'error_message' => _e(),
                'form_action' => './?object=' . ($_GET['object'] ?? null) . '&action=' . ($_GET['action'] ?? null) . '&id=' . ($_GET['id'] ?? null),
                'name' => _prepare_html(isset($_POST['name']) ? ($_POST['name'] ?? null) : ( ! empty($this->_user_info['display_name']) ? $this->_user_info['display_name'] : $this->_user_info['name'])),
                'email' => _prepare_html(isset($_POST['email']) ? ($_POST['email'] ?? null) : $this->_user_info['email']),
                'message' => _prepare_html(isset($_POST['message']) ? ($_POST['message'] ?? null) : $text),
                'comment' => _prepare_html($_POST['comment'] ?? null),
                'page_preview' => isset($_POST['message']) ? ($_POST['message'] ?? null) : $text,
            ];
            return tpl()->parse('system/common/email_page_form', $replace);
        }
    }

    public function __construct()
    {
        $this->_user_info = &main()->USER_INFO;
        if ( ! $this->_user_info) {
            $this->_user_info = user(main()->USER_ID);
        }
    }