//.........这里部分代码省略.........

    } else if (isguestuser() or !isloggedin() or $forum->type == 'news') {
        // no button and no info

    } else if ($groupmode and has_capability('mod/forum:startdiscussion', $context)) {
        // inform users why they can not post new discussion
        if ($currentgroup) {
            echo $OUTPUT->notification(get_string('cannotadddiscussion', 'forum'));
        } else {
            echo $OUTPUT->notification(get_string('cannotadddiscussionall', 'forum'));
        }
    }

// Get all the recent discussions we're allowed to see

    $getuserlastmodified = ($displayformat == 'header');

    if (! $discussions = forum_get_discussions($cm, $sort, $fullpost, null, $maxdiscussions, $getuserlastmodified, $page, $perpage) ) {
        echo '<div class="forumnodiscuss">';
        if ($forum->type == 'news') {
            echo '('.get_string('nonews', 'forum').')';
        } else if ($forum->type == 'qanda') {
            echo '('.get_string('noquestions','forum').')';
        } else {
            echo '('.get_string('nodiscussions', 'forum').')';
        }
        echo "</div>\n";
        return;
    }

// If we want paging
    if ($page != -1) {
        ///Get the number of discussions found
        $numdiscussions = forum_get_discussions_count($cm);

        ///Show the paging bar
        echo $OUTPUT->paging_bar($numdiscussions, $page, $perpage, "view.php?f=$forum->id");
        if ($numdiscussions > 1000) {
            // saves some memory on sites with very large forums
            $replies = forum_count_discussion_replies($forum->id, $sort, $maxdiscussions, $page, $perpage);
        } else {
            $replies = forum_count_discussion_replies($forum->id);
        }

    } else {
        $replies = forum_count_discussion_replies($forum->id);

        if ($maxdiscussions > 0 and $maxdiscussions <= count($discussions)) {
            $olddiscussionlink = true;
        }
    }

    $canviewparticipants = has_capability('moodle/course:viewparticipants',$context);

    $strdatestring = get_string('strftimerecentfull');

    // Check if the forum is tracked.
    if ($cantrack = forum_tp_can_track_forums($forum)) {
        $forumtracked = forum_tp_is_tracked($forum);
    } else {
        $forumtracked = false;
    }

    if ($forumtracked) {
        $unreads = forum_get_discussions_unread($cm);
    } else {

//.........这里部分代码省略.........
    } else {
        if (isguestuser() or !isloggedin() or $forum->type == 'news') {
            // no button and no info
        } else {
            if ($groupmode and has_capability('mod/forum:startdiscussion', $context)) {
                // inform users why they can not post new discussion
                if ($currentgroup) {
                    notify(get_string('cannotadddiscussion', 'forum'));
                } else {
                    notify(get_string('cannotadddiscussionall', 'forum'));
                }
            }
        }
    }
    // Get all the recent discussions we're allowed to see
    $getuserlastmodified = $displayformat == 'header';
    if (!($discussions = forum_get_discussions($cm, $sort, $fullpost, null, $maxdiscussions, $getuserlastmodified, $page, $perpage))) {
        echo '<div class="forumnodiscuss">';
        if ($forum->type == 'news') {
            echo '(' . get_string('nonews', 'forum') . ')';
        } else {
            if ($forum->type == 'qanda') {
                echo '(' . get_string('noquestions', 'forum') . ')';
            } else {
                echo '(' . get_string('nodiscussions', 'forum') . ')';
            }
        }
        echo "</div>\n";
        return;
    }
    // If we want paging
    if ($page != -1) {
        ///Get the number of discussions found
        $numdiscussions = forum_get_discussions_count($cm);
        ///Show the paging bar
        print_paging_bar($numdiscussions, $page, $perpage, "view.php?f={$forum->id}&amp;");
        if ($numdiscussions > 1000) {
            // saves some memory on sites with very large forums
            $replies = forum_count_discussion_replies($forum->id, $sort, $maxdiscussions, $page, $perpage);
        } else {
            $replies = forum_count_discussion_replies($forum->id);
        }
    } else {
        $replies = forum_count_discussion_replies($forum->id);
        if ($maxdiscussions > 0 and $maxdiscussions <= count($discussions)) {
            $olddiscussionlink = true;
        }
    }
    $canviewparticipants = has_capability('moodle/course:viewparticipants', $context);
    $strdatestring = get_string('strftimerecentfull');
    // Check if the forum is tracked.
    if ($cantrack = forum_tp_can_track_forums($forum)) {
        $forumtracked = forum_tp_is_tracked($forum);
    } else {
        $forumtracked = false;
    }
    if ($forumtracked) {
        $unreads = forum_get_discussions_unread($cm);
    } else {
        $unreads = array();
    }
    if ($displayformat == 'header') {
        echo '<table cellspacing="0" class="forumheaderlist">';
        echo '<thead>';
        echo '<tr>';
        echo '<th class="header topic" scope="col">' . get_string('discussion', 'forum') . '</th>';