//.........这里部分代码省略.........
    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 {
        $unreads = array();
    }

    if ($displayformat == 'header') {
        echo '<table cellspacing="0" class="forumheaderlist">';
        echo '<thead>';
        echo '<tr>';
        echo '<th class="header topic" scope="col">'.get_string('discussion', 'forum').'</th>';
        echo '<th class="header author" colspan="2" scope="col">'.get_string('startedby', 'forum').'</th>';
        if ($groupmode > 0) {
            echo '<th class="header group" scope="col">'.get_string('group').'</th>';
        }
        if (has_capability('mod/forum:viewdiscussion', $context)) {
            echo '<th class="header replies" scope="col">'.get_string('replies', 'forum').'</th>';
            // If the forum can be tracked, display the unread column.
            if ($cantrack) {
                echo '<th class="header replies" scope="col">'.get_string('unread', 'forum');
                if ($forumtracked) {
                    echo '<a title="'.get_string('markallread', 'forum').
                         '" href="'.$CFG->wwwroot.'/mod/forum/markposts.php?f='.
                         $forum->id.'&amp;mark=read&amp;returnpage=view.php">'.
                         '<img src="'.$OUTPUT->pix_url('t/markasread') . '" class="iconsmall" alt="'.get_string('markallread', 'forum').'" /></a>';
                }
                echo '</th>';
            }
        }
        echo '<th class="header lastpost" scope="col">'.get_string('lastpost', 'forum').'</th>';
        echo '</tr>';
        echo '</thead>';
        echo '<tbody>';
    }

 /**
  * Returns a list of forum discussions as well as a summary of the discussion
  * in a provided list of forums.
  *
  * @param array $forumids the forum ids
  * @param int $limitfrom limit from SQL data
  * @param int $limitnum limit number SQL data
  *
  * @return array the forum discussion details
  * @since Moodle 2.5
  */
 public static function get_forum_discussions($forumids, $limitfrom = 0, $limitnum = 0)
 {
     global $CFG, $DB, $USER;
     require_once $CFG->dirroot . "/mod/forum/lib.php";
     // Validate the parameter.
     $params = self::validate_parameters(self::get_forum_discussions_parameters(), array('forumids' => $forumids, 'limitfrom' => $limitfrom, 'limitnum' => $limitnum));
     $forumids = $params['forumids'];
     $limitfrom = $params['limitfrom'];
     $limitnum = $params['limitnum'];
     // Array to store the forum discussions to return.
     $arrdiscussions = array();
     // Keep track of the users we have looked up in the DB.
     $arrusers = array();
     // Loop through them.
     foreach ($forumids as $id) {
         // Get the forum object.
         $forum = $DB->get_record('forum', array('id' => $id), '*', MUST_EXIST);
         $course = get_course($forum->course);
         $modinfo = get_fast_modinfo($course);
         $forums = $modinfo->get_instances_of('forum');
         $cm = $forums[$forum->id];
         // Get the module context.
         $modcontext = context_module::instance($cm->id);
         // Validate the context.
         self::validate_context($modcontext);
         require_capability('mod/forum:viewdiscussion', $modcontext);
         // Get the discussions for this forum.
         $params = array();
         $groupselect = "";
         $groupmode = groups_get_activity_groupmode($cm, $course);
         if ($groupmode and $groupmode != VISIBLEGROUPS and !has_capability('moodle/site:accessallgroups', $modcontext)) {
             // Get all the discussions from all the groups this user belongs to.
             $usergroups = groups_get_user_groups($course->id);
             if (!empty($usergroups['0'])) {
                 list($sql, $params) = $DB->get_in_or_equal($usergroups['0']);
                 $groupselect = "AND (groupid {$sql} OR groupid = -1)";
             }
         }
         array_unshift($params, $id);
         $select = "forum = ? {$groupselect}";
         if ($discussions = $DB->get_records_select('forum_discussions', $select, $params, 'timemodified DESC', '*', $limitfrom, $limitnum)) {
             // Check if they can view full names.
             $canviewfullname = has_capability('moodle/site:viewfullnames', $modcontext);
             // Get the unreads array, this takes a forum id and returns data for all discussions.
             $unreads = array();
             if ($cantrack = forum_tp_can_track_forums($forum)) {
                 if ($forumtracked = forum_tp_is_tracked($forum)) {
                     $unreads = forum_get_discussions_unread($cm);
                 }
             }
             // The forum function returns the replies for all the discussions in a given forum.
             $replies = forum_count_discussion_replies($id);
             foreach ($discussions as $discussion) {
                 // This function checks capabilities, timed discussions, groups and qanda forums posting.
                 if (!forum_user_can_see_discussion($forum, $discussion, $modcontext)) {
                     continue;
                 }
                 $usernamefields = user_picture::fields();
                 // If we don't have the users details then perform DB call.
                 if (empty($arrusers[$discussion->userid])) {
                     $arrusers[$discussion->userid] = $DB->get_record('user', array('id' => $discussion->userid), $usernamefields, MUST_EXIST);
                 }
                 // Get the subject.
                 $subject = $DB->get_field('forum_posts', 'subject', array('id' => $discussion->firstpost), MUST_EXIST);
                 // Create object to return.
                 $return = new stdClass();
                 $return->id = (int) $discussion->id;
                 $return->course = $discussion->course;
                 $return->forum = $discussion->forum;
                 $return->name = $discussion->name;
                 $return->userid = $discussion->userid;
                 $return->groupid = $discussion->groupid;
                 $return->assessed = $discussion->assessed;
                 $return->timemodified = (int) $discussion->timemodified;
                 $return->usermodified = $discussion->usermodified;
                 $return->timestart = $discussion->timestart;
                 $return->timeend = $discussion->timeend;
                 $return->firstpost = (int) $discussion->firstpost;
                 $return->firstuserfullname = fullname($arrusers[$discussion->userid], $canviewfullname);
                 $return->firstuserimagealt = $arrusers[$discussion->userid]->imagealt;
                 $return->firstuserpicture = $arrusers[$discussion->userid]->picture;
                 $return->firstuseremail = $arrusers[$discussion->userid]->email;
                 $return->subject = $subject;
                 $return->numunread = '';
                 if ($cantrack && $forumtracked) {
                     if (isset($unreads[$discussion->id])) {
                         $return->numunread = (int) $unreads[$discussion->id];
                     }
                 }
//.........这里部分代码省略.........

    /**
     * Returns a list of forum discussions as well as a summary of the discussion
     * in a provided list of forums.
     *
     * @param array $forumids the forum ids
     * @return array the forum discussion details
     * @since Moodle 2.5
     */
    public static function get_forum_discussions($forumids) {
        global $CFG, $DB, $USER;

        require_once($CFG->dirroot . "/mod/forum/lib.php");

        // Validate the parameter.
        $params = self::validate_parameters(self::get_forum_discussions_parameters(), array('forumids' => $forumids));
        $forumids = $params['forumids'];

        // Array to store the forum discussions to return.
        $arrdiscussions = array();
        // Keep track of the course ids we have performed a require_course_login check on to avoid repeating.
        $arrcourseschecked = array();
        // Store the modinfo for the forums in an individual courses.
        $arrcoursesforuminfo = array();
        // Keep track of the users we have looked up in the DB.
        $arrusers = array();

        // Loop through them.
        foreach ($forumids as $id) {
            // Get the forum object.
            $forum = $DB->get_record('forum', array('id' => $id), '*', MUST_EXIST);
            // Check that that user can view this course if check not performed yet.
            if (!in_array($forum->course, $arrcourseschecked)) {
                // Check the user can function in this context.
                self::validate_context(context_course::instance($forum->course));
                // Add to the array.
                $arrcourseschecked[] = $forum->course;
            }
            // Get the modinfo for the course if we haven't already.
            if (!isset($arrcoursesforuminfo[$forum->course])) {
                $modinfo = get_fast_modinfo($forum->course);
                $arrcoursesforuminfo[$forum->course] = $modinfo->get_instances_of('forum');
            }
            // Check if this forum does not exist in the modinfo array, should always be false unless DB is borked.
            if (empty($arrcoursesforuminfo[$forum->course][$forum->id])) {
                throw new moodle_exception('invalidmodule', 'error');
            }
            // We now have the course module.
            $cm = $arrcoursesforuminfo[$forum->course][$forum->id];
            // If the forum is not visible throw an exception.
            if (!$cm->uservisible) {
                throw new moodle_exception('nopermissiontoshow', 'error');
            }
            // Get the module context.
            $modcontext = context_module::instance($cm->id);
            // Check they have the view forum capability.
            require_capability('mod/forum:viewdiscussion', $modcontext);
            // Check if they can view full names.
            $canviewfullname = has_capability('moodle/site:viewfullnames', $modcontext);
            // Get the unreads array, this takes a forum id and returns data for all discussions.
            $unreads = array();
            if ($cantrack = forum_tp_can_track_forums($forum)) {
                if ($forumtracked = forum_tp_is_tracked($forum)) {
                    $unreads = forum_get_discussions_unread($cm);
                }
            }
            // The forum function returns the replies for all the discussions in a given forum.
            $replies = forum_count_discussion_replies($id);
            // Get the discussions for this forum.
            if ($discussions = $DB->get_records('forum_discussions', array('forum' => $id))) {
                foreach ($discussions as $discussion) {
                    // If the forum is of type qanda and the user has not posted in the discussion
                    // we need to ensure that they have the required capability.
                    if ($forum->type == 'qanda' && !forum_user_has_posted($discussion->forum, $discussion->id, $USER->id)) {
                        require_capability('mod/forum:viewqandawithoutposting', $modcontext);
                    }
                    // If we don't have the users details then perform DB call.
                    if (empty($arrusers[$discussion->userid])) {
                        $arrusers[$discussion->userid] = $DB->get_record('user', array('id' => $discussion->userid),
                            'firstname, lastname, email, picture, imagealt', MUST_EXIST);
                    }
                    // Get the subject.
                    $subject = $DB->get_field('forum_posts', 'subject', array('id' => $discussion->firstpost), MUST_EXIST);
                    // Create object to return.
                    $return = new stdClass();
                    $return->id = (int) $discussion->id;
                    $return->course = $discussion->course;
                    $return->forum = $discussion->forum;
                    $return->name = $discussion->name;
                    $return->userid = $discussion->userid;
                    $return->groupid = $discussion->groupid;
                    $return->assessed = $discussion->assessed;
                    $return->timemodified = (int) $discussion->timemodified;
                    $return->usermodified = $discussion->usermodified;
                    $return->timestart = $discussion->timestart;
                    $return->timeend = $discussion->timeend;
                    $return->firstpost = (int) $discussion->firstpost;
                    $return->firstuserfullname = fullname($arrusers[$discussion->userid], $canviewfullname);
                    $return->firstuserimagealt = $arrusers[$discussion->userid]->imagealt;
                    $return->firstuserpicture = $arrusers[$discussion->userid]->picture;
                    $return->firstuseremail = $arrusers[$discussion->userid]->email;
//.........这里部分代码省略.........

 /**
  * Returns a list of forum discussions optionally sorted and paginated.
  *
  * @param int $forumid the forum instance id
  * @param string $sortby sort by this element (id, timemodified, timestart or timeend)
  * @param string $sortdirection sort direction: ASC or DESC
  * @param int $page page number
  * @param int $perpage items per page
  *
  * @return array the forum discussion details including warnings
  * @since Moodle 2.8
  */
 public static function get_forum_discussions_paginated($forumid, $sortby = 'timemodified', $sortdirection = 'DESC', $page = -1, $perpage = 0)
 {
     global $CFG, $DB, $USER;
     require_once $CFG->dirroot . "/mod/forum/lib.php";
     $warnings = array();
     $discussions = array();
     $params = self::validate_parameters(self::get_forum_discussions_paginated_parameters(), array('forumid' => $forumid, 'sortby' => $sortby, 'sortdirection' => $sortdirection, 'page' => $page, 'perpage' => $perpage));
     // Compact/extract functions are not recommended.
     $forumid = $params['forumid'];
     $sortby = $params['sortby'];
     $sortdirection = $params['sortdirection'];
     $page = $params['page'];
     $perpage = $params['perpage'];
     $sortallowedvalues = array('id', 'timemodified', 'timestart', 'timeend');
     if (!in_array($sortby, $sortallowedvalues)) {
         throw new invalid_parameter_exception('Invalid value for sortby parameter (value: ' . $sortby . '),' . 'allowed values are: ' . implode(',', $sortallowedvalues));
     }
     $sortdirection = strtoupper($sortdirection);
     $directionallowedvalues = array('ASC', 'DESC');
     if (!in_array($sortdirection, $directionallowedvalues)) {
         throw new invalid_parameter_exception('Invalid value for sortdirection parameter (value: ' . $sortdirection . '),' . 'allowed values are: ' . implode(',', $directionallowedvalues));
     }
     $forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST);
     $course = $DB->get_record('course', array('id' => $forum->course), '*', MUST_EXIST);
     $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
     // Validate the module context. It checks everything that affects the module visibility (including groupings, etc..).
     $modcontext = context_module::instance($cm->id);
     self::validate_context($modcontext);
     // Check they have the view forum capability.
     require_capability('mod/forum:viewdiscussion', $modcontext, null, true, 'noviewdiscussionspermission', 'forum');
     $sort = 'd.' . $sortby . ' ' . $sortdirection;
     $alldiscussions = forum_get_discussions($cm, $sort, true, -1, -1, true, $page, $perpage);
     if ($alldiscussions) {
         $canviewfullname = has_capability('moodle/site:viewfullnames', $modcontext);
         // Get the unreads array, this takes a forum id and returns data for all discussions.
         $unreads = array();
         if ($cantrack = forum_tp_can_track_forums($forum)) {
             if ($forumtracked = forum_tp_is_tracked($forum)) {
                 $unreads = forum_get_discussions_unread($cm);
             }
         }
         // The forum function returns the replies for all the discussions in a given forum.
         $replies = forum_count_discussion_replies($forumid, $sort, -1, $page, $perpage);
         foreach ($alldiscussions as $discussion) {
             // This function checks for qanda forums.
             // Note that the forum_get_discussions returns as id the post id, not the discussion id so we need to do this.
             $discussionrec = clone $discussion;
             $discussionrec->id = $discussion->discussion;
             if (!forum_user_can_see_discussion($forum, $discussionrec, $modcontext)) {
                 $warning = array();
                 // Function forum_get_discussions returns forum_posts ids not forum_discussions ones.
                 $warning['item'] = 'post';
                 $warning['itemid'] = $discussion->id;
                 $warning['warningcode'] = '1';
                 $warning['message'] = 'You can\'t see this discussion';
                 $warnings[] = $warning;
                 continue;
             }
             $discussion->numunread = 0;
             if ($cantrack && $forumtracked) {
                 if (isset($unreads[$discussion->discussion])) {
                     $discussion->numunread = (int) $unreads[$discussion->discussion];
                 }
             }
             $discussion->numreplies = 0;
             if (!empty($replies[$discussion->discussion])) {
                 $discussion->numreplies = (int) $replies[$discussion->discussion]->replies;
             }
             // Load user objects from the results of the query.
             $user = new stdclass();
             $user->id = $discussion->userid;
             $user = username_load_fields_from_object($user, $discussion);
             $discussion->userfullname = fullname($user, $canviewfullname);
             // We can have post written by users that are deleted. In this case, those users don't have a valid context.
             $usercontext = context_user::instance($user->id, IGNORE_MISSING);
             if ($usercontext) {
                 $discussion->userpictureurl = moodle_url::make_webservice_pluginfile_url($usercontext->id, 'user', 'icon', null, '/', 'f1')->out(false);
             } else {
                 $discussion->userpictureurl = '';
             }
             $usermodified = new stdclass();
             $usermodified->id = $discussion->usermodified;
             $usermodified = username_load_fields_from_object($usermodified, $discussion, 'um');
             $discussion->usermodifiedfullname = fullname($usermodified, $canviewfullname);
             // We can have post written by users that are deleted. In this case, those users don't have a valid context.
             $usercontext = context_user::instance($usermodified->id, IGNORE_MISSING);
             if ($usercontext) {
                 $discussion->usermodifiedpictureurl = moodle_url::make_webservice_pluginfile_url($usercontext->id, 'user', 'icon', null, '/', 'f1')->out(false);
//.........这里部分代码省略.........

 /**
  * Returns a list of forum discussions optionally sorted and paginated.
  *
  * @param int $forumid the forum instance id
  * @param string $sortby sort by this element (id, timemodified, timestart or timeend)
  * @param string $sortdirection sort direction: ASC or DESC
  * @param int $page page number
  * @param int $perpage items per page
  *
  * @return array the forum discussion details including warnings
  * @since Moodle 2.8
  */
 public static function get_forum_discussions_paginated($forumid, $sortby = 'timemodified', $sortdirection = 'DESC', $page = -1, $perpage = 0)
 {
     global $CFG, $DB, $USER, $PAGE;
     require_once $CFG->dirroot . "/mod/forum/lib.php";
     $warnings = array();
     $discussions = array();
     $params = self::validate_parameters(self::get_forum_discussions_paginated_parameters(), array('forumid' => $forumid, 'sortby' => $sortby, 'sortdirection' => $sortdirection, 'page' => $page, 'perpage' => $perpage));
     // Compact/extract functions are not recommended.
     $forumid = $params['forumid'];
     $sortby = $params['sortby'];
     $sortdirection = $params['sortdirection'];
     $page = $params['page'];
     $perpage = $params['perpage'];
     $sortallowedvalues = array('id', 'timemodified', 'timestart', 'timeend');
     if (!in_array($sortby, $sortallowedvalues)) {
         throw new invalid_parameter_exception('Invalid value for sortby parameter (value: ' . $sortby . '),' . 'allowed values are: ' . implode(',', $sortallowedvalues));
     }
     $sortdirection = strtoupper($sortdirection);
     $directionallowedvalues = array('ASC', 'DESC');
     if (!in_array($sortdirection, $directionallowedvalues)) {
         throw new invalid_parameter_exception('Invalid value for sortdirection parameter (value: ' . $sortdirection . '),' . 'allowed values are: ' . implode(',', $directionallowedvalues));
     }
     $forum = $DB->get_record('forum', array('id' => $forumid), '*', MUST_EXIST);
     $course = $DB->get_record('course', array('id' => $forum->course), '*', MUST_EXIST);
     $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
     // Validate the module context. It checks everything that affects the module visibility (including groupings, etc..).
     $modcontext = context_module::instance($cm->id);
     self::validate_context($modcontext);
     // Check they have the view forum capability.
     require_capability('mod/forum:viewdiscussion', $modcontext, null, true, 'noviewdiscussionspermission', 'forum');
     $sort = 'd.pinned DESC, d.' . $sortby . ' ' . $sortdirection;
     $alldiscussions = forum_get_discussions($cm, $sort, true, -1, -1, true, $page, $perpage, FORUM_POSTS_ALL_USER_GROUPS);
     if ($alldiscussions) {
         $canviewfullname = has_capability('moodle/site:viewfullnames', $modcontext);
         // Get the unreads array, this takes a forum id and returns data for all discussions.
         $unreads = array();
         if ($cantrack = forum_tp_can_track_forums($forum)) {
             if ($forumtracked = forum_tp_is_tracked($forum)) {
                 $unreads = forum_get_discussions_unread($cm);
             }
         }
         // The forum function returns the replies for all the discussions in a given forum.
         $replies = forum_count_discussion_replies($forumid, $sort, -1, $page, $perpage);
         foreach ($alldiscussions as $discussion) {
             // This function checks for qanda forums.
             // Note that the forum_get_discussions returns as id the post id, not the discussion id so we need to do this.
             $discussionrec = clone $discussion;
             $discussionrec->id = $discussion->discussion;
             if (!forum_user_can_see_discussion($forum, $discussionrec, $modcontext)) {
                 $warning = array();
                 // Function forum_get_discussions returns forum_posts ids not forum_discussions ones.
                 $warning['item'] = 'post';
                 $warning['itemid'] = $discussion->id;
                 $warning['warningcode'] = '1';
                 $warning['message'] = 'You can\'t see this discussion';
                 $warnings[] = $warning;
                 continue;
             }
             $discussion->numunread = 0;
             if ($cantrack && $forumtracked) {
                 if (isset($unreads[$discussion->discussion])) {
                     $discussion->numunread = (int) $unreads[$discussion->discussion];
                 }
             }
             $discussion->numreplies = 0;
             if (!empty($replies[$discussion->discussion])) {
                 $discussion->numreplies = (int) $replies[$discussion->discussion]->replies;
             }
             $discussion->name = external_format_string($discussion->name, $modcontext->id);
             $discussion->subject = external_format_string($discussion->subject, $modcontext->id);
             // Rewrite embedded images URLs.
             list($discussion->message, $discussion->messageformat) = external_format_text($discussion->message, $discussion->messageformat, $modcontext->id, 'mod_forum', 'post', $discussion->id);
             // List attachments.
             if (!empty($discussion->attachment)) {
                 $discussion->attachments = external_util::get_area_files($modcontext->id, 'mod_forum', 'attachment', $discussion->id);
             }
             $messageinlinefiles = external_util::get_area_files($modcontext->id, 'mod_forum', 'post', $discussion->id);
             if (!empty($messageinlinefiles)) {
                 $discussion->messageinlinefiles = $messageinlinefiles;
             }
             $discussion->locked = forum_discussion_is_locked($forum, $discussion);
             $discussion->canreply = forum_user_can_post($forum, $discussion, $USER, $cm, $course, $modcontext);
             if (forum_is_author_hidden($discussion, $forum)) {
                 $discussion->userid = null;
                 $discussion->userfullname = null;
                 $discussion->userpictureurl = null;
                 $discussion->usermodified = null;
                 $discussion->usermodifiedfullname = null;
//.........这里部分代码省略.........

//.........这里部分代码省略.........
                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>';
        echo '<th class="header author" colspan="2" scope="col">' . get_string('startedby', 'forum') . '</th>';
        if ($groupmode > 0) {
            echo '<th class="header group" scope="col">' . get_string('group') . '</th>';
        }
        if (has_capability('mod/forum:viewdiscussion', $context)) {
            echo '<th class="header replies" scope="col">' . get_string('replies', 'forum') . '</th>';
            // If the forum can be tracked, display the unread column.
            if ($cantrack) {
                echo '<th class="header replies" scope="col">' . get_string('unread', 'forum');
                if ($forumtracked) {
                    echo '&nbsp;<a title="' . get_string('markallread', 'forum') . '" href="' . $CFG->wwwroot . '/mod/forum/markposts.php?f=' . $forum->id . '&amp;mark=read&amp;returnpage=view.php">' . '<img src="' . $CFG->pixpath . '/t/clear.gif" class="iconsmall" alt="' . get_string('markallread', 'forum') . '" /></a>';
                }
                echo '</th>';
            }
        }
        echo '<th class="header lastpost" scope="col">' . get_string('lastpost', 'forum') . '</th>';
        echo '</tr>';
        echo '</thead>';
        echo '<tbody>';
    }
    foreach ($discussions as $discussion) {
        if (!empty($replies[$discussion->discussion])) {
            $discussion->replies = $replies[$discussion->discussion]->replies;
            $discussion->lastpostid = $replies[$discussion->discussion]->lastpostid;