/**
 * Check if the module has any update that affects the current user since a given time.
 *
 * @param  cm_info $cm course module data
 * @param  int $from the time to check updates from
 * @param  array $filter  if we need to check only specific updates
 * @return stdClass an object with the different type of areas indicating if they were updated or not
 * @since Moodle 3.2
 */
function forum_check_updates_since(cm_info $cm, $from, $filter = array())
{
    $context = $cm->context;
    $updates = new stdClass();
    if (!has_capability('mod/forum:viewdiscussion', $context)) {
        return $updates;
    }
    $updates = course_check_module_updates_since($cm, $from, array(), $filter);
    // Check if there are new discussions in the forum.
    $updates->discussions = (object) array('updated' => false);
    $discussions = forum_get_discussions($cm, '', false, -1, -1, true, -1, 0, FORUM_POSTS_ALL_USER_GROUPS, $from);
    if (!empty($discussions)) {
        $updates->discussions->updated = true;
        $updates->discussions->itemids = array_keys($discussions);
    }
    return $updates;
}

//.........这里部分代码省略.........
        switch ($forum->type) {
            case 'news':
            case 'blog':
                $buttonadd = get_string('addanewtopic', 'forum');
                break;
            case 'qanda':
                $buttonadd = get_string('addanewquestion', 'forum');
                break;
            default:
                $buttonadd = get_string('addanewdiscussion', 'forum');
                break;
        }
        echo '<input type="submit" value="'.$buttonadd.'" />';
        echo '</div>';
        echo '</form>';
        echo "</div>\n";

    } 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;
        }

 /**
  * Test forum_get_discussions
  */
 public function test_forum_get_discussions_with_groups()
 {
     global $DB;
     $this->resetAfterTest(true);
     // Create course to add the module.
     $course = self::getDataGenerator()->create_course(array('groupmode' => VISIBLEGROUPS, 'groupmodeforce' => 0));
     $user1 = self::getDataGenerator()->create_user();
     $user2 = self::getDataGenerator()->create_user();
     $user3 = self::getDataGenerator()->create_user();
     $role = $DB->get_record('role', array('shortname' => 'student'), '*', MUST_EXIST);
     self::getDataGenerator()->enrol_user($user1->id, $course->id, $role->id);
     self::getDataGenerator()->enrol_user($user2->id, $course->id, $role->id);
     self::getDataGenerator()->enrol_user($user3->id, $course->id, $role->id);
     // Forum forcing separate gropus.
     $record = new stdClass();
     $record->course = $course->id;
     $forum = self::getDataGenerator()->create_module('forum', $record, array('groupmode' => SEPARATEGROUPS));
     $cm = get_coursemodule_from_instance('forum', $forum->id);
     // Create groups.
     $group1 = self::getDataGenerator()->create_group(array('courseid' => $course->id));
     $group2 = self::getDataGenerator()->create_group(array('courseid' => $course->id));
     $group3 = self::getDataGenerator()->create_group(array('courseid' => $course->id));
     // Add the user1 to g1 and g2 groups.
     groups_add_member($group1->id, $user1->id);
     groups_add_member($group2->id, $user1->id);
     // Add the user 2 and 3 to only one group.
     groups_add_member($group1->id, $user2->id);
     groups_add_member($group3->id, $user3->id);
     // Add a few discussions.
     $record = array();
     $record['course'] = $course->id;
     $record['forum'] = $forum->id;
     $record['userid'] = $user1->id;
     $record['groupid'] = $group1->id;
     $discussiong1u1 = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
     $record['groupid'] = $group2->id;
     $discussiong2u1 = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
     $record['userid'] = $user2->id;
     $record['groupid'] = $group1->id;
     $discussiong1u2 = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
     $record['userid'] = $user3->id;
     $record['groupid'] = $group3->id;
     $discussiong3u3 = self::getDataGenerator()->get_plugin_generator('mod_forum')->create_discussion($record);
     self::setUser($user1);
     // Test retrieve discussions not passing the groupid parameter. We will receive only first group discussions.
     $discussions = forum_get_discussions($cm);
     self::assertCount(2, $discussions);
     foreach ($discussions as $discussion) {
         self::assertEquals($group1->id, $discussion->groupid);
     }
     // Get all my discussions.
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, 0);
     self::assertCount(3, $discussions);
     // Get all my g1 discussions.
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, $group1->id);
     self::assertCount(2, $discussions);
     foreach ($discussions as $discussion) {
         self::assertEquals($group1->id, $discussion->groupid);
     }
     // Get all my g2 discussions.
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, $group2->id);
     self::assertCount(1, $discussions);
     $discussion = array_shift($discussions);
     self::assertEquals($group2->id, $discussion->groupid);
     self::assertEquals($user1->id, $discussion->userid);
     self::assertEquals($discussiong2u1->id, $discussion->discussion);
     // Get all my g3 discussions (I'm not enrolled in that group).
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, $group3->id);
     self::assertCount(0, $discussions);
     // This group does not exist.
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, $group3->id + 1000);
     self::assertCount(0, $discussions);
     self::setUser($user2);
     // Test retrieve discussions not passing the groupid parameter. We will receive only first group discussions.
     $discussions = forum_get_discussions($cm);
     self::assertCount(2, $discussions);
     foreach ($discussions as $discussion) {
         self::assertEquals($group1->id, $discussion->groupid);
     }
     // Get all my viewable discussions.
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, 0);
     self::assertCount(2, $discussions);
     foreach ($discussions as $discussion) {
         self::assertEquals($group1->id, $discussion->groupid);
     }
     // Get all my g2 discussions (I'm not enrolled in that group).
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, $group2->id);
     self::assertCount(0, $discussions);
     // Get all my g3 discussions (I'm not enrolled in that group).
     $discussions = forum_get_discussions($cm, '', true, -1, -1, false, -1, 0, $group3->id);
     self::assertCount(0, $discussions);
 }

 function get_content()
 {
     global $CFG, $USER;
     if ($this->content !== NULL) {
         return $this->content;
     }
     $this->content = new stdClass();
     $this->content->text = '';
     $this->content->footer = '';
     if (empty($this->instance)) {
         return $this->content;
     }
     if ($this->page->course->newsitems) {
         // Create a nice listing of recent postings
         require_once $CFG->dirroot . '/mod/forum/lib.php';
         // We'll need this
         $text = '';
         if (!($forum = forum_get_course_forum($this->page->course->id, 'news'))) {
             return '';
         }
         $modinfo = get_fast_modinfo($this->page->course);
         if (empty($modinfo->instances['forum'][$forum->id])) {
             return '';
         }
         $cm = $modinfo->instances['forum'][$forum->id];
         if (!$cm->uservisible) {
             return '';
         }
         $context = context_module::instance($cm->id);
         /// User must have perms to view discussions in that forum
         if (!has_capability('mod/forum:viewdiscussion', $context)) {
             return '';
         }
         /// First work out whether we can post to this group and if so, include a link
         $groupmode = groups_get_activity_groupmode($cm);
         $currentgroup = groups_get_activity_group($cm, true);
         if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context)) {
             $text .= '<div class="newlink"><a href="' . $CFG->wwwroot . '/mod/forum/post.php?forum=' . $forum->id . '">' . get_string('addanewtopic', 'forum') . '</a>...</div>';
         }
         /// Get all the recent discussions we're allowed to see
         if (!($discussions = forum_get_discussions($cm, 'p.modified DESC', false, $currentgroup, $this->page->course->newsitems))) {
             $text .= '(' . get_string('nonews', 'forum') . ')';
             $this->content->text = $text;
             return $this->content;
         }
         /// Actually create the listing now
         $strftimerecent = get_string('strftimerecent');
         $strmore = get_string('more', 'forum');
         /// Accessibility: markup as a list.
         $text .= "\n<ul class='unlist'>\n";
         foreach ($discussions as $discussion) {
             $discussion->subject = $discussion->name;
             $discussion->subject = format_string($discussion->subject, true, $forum->course);
             $text .= '<li class="post">' . '<div class="head clearfix">' . '<div class="date">' . userdate($discussion->modified, $strftimerecent) . '</div>' . '<div class="name">' . fullname($discussion) . '</div></div>' . '<div class="info"><a href="' . $CFG->wwwroot . '/mod/forum/discuss.php?d=' . $discussion->discussion . '">' . $discussion->subject . '</a></div>' . "</li>\n";
         }
         $text .= "</ul>\n";
         $this->content->text = $text;
         $this->content->footer = '<a href="' . $CFG->wwwroot . '/mod/forum/view.php?f=' . $forum->id . '">' . get_string('oldertopics', 'forum') . '</a> ...';
         /// If RSS is activated at site and forum level and this forum has rss defined, show link
         if (isset($CFG->enablerssfeeds) && isset($CFG->forum_enablerssfeeds) && $CFG->enablerssfeeds && $CFG->forum_enablerssfeeds && $forum->rsstype && $forum->rssarticles) {
             require_once $CFG->dirroot . '/lib/rsslib.php';
             // We'll need this
             if ($forum->rsstype == 1) {
                 $tooltiptext = get_string('rsssubscriberssdiscussions', 'forum');
             } else {
                 $tooltiptext = get_string('rsssubscriberssposts', 'forum');
             }
             if (!isloggedin()) {
                 $userid = $CFG->siteguest;
             } else {
                 $userid = $USER->id;
             }
             $this->content->footer .= '<br />' . rss_get_link($context->id, $userid, 'mod_forum', $forum->id, $tooltiptext);
         }
     }
     return $this->content;
 }

 /**
  * Creates an small test course with fixed data set and checks the used sections and users.
  */
 public function test_fixed_data_set()
 {
     $this->resetAfterTest();
     $this->setAdminUser();
     // Create the S course (more sections and activities than XS).
     $backend = new tool_generator_course_backend('TOOL_S_COURSE_1', 1, true, false, false);
     $courseid = $backend->make();
     // Get course details.
     $course = get_course($courseid);
     $modinfo = get_fast_modinfo($course);
     // Check module instances belongs to section 1.
     $instances = $modinfo->get_instances_of('page');
     foreach ($instances as $instance) {
         $this->assertEquals(1, $instance->sectionnum);
     }
     // Users that started discussions are the same.
     $forums = $modinfo->get_instances_of('forum');
     $discussions = forum_get_discussions(reset($forums), 'd.timemodified ASC');
     $lastusernumber = 0;
     $discussionstarters = array();
     foreach ($discussions as $discussion) {
         $usernumber = intval($discussion->lastname);
         // Checks that the users are odd numbers.
         $this->assertEquals(1, $usernumber % 2);
         // Checks that the users follows an increasing order.
         $this->assertGreaterThan($lastusernumber, $usernumber);
         $lastusernumber = $usernumber;
         $discussionstarters[$discussion->userid] = $discussion->subject;
     }
 }

 /**
  * 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 last news for a course
  * 
  * @param int $id Course identifier
  */
 function get_news_items($id)
 {
     global $CFG, $DB;
     $conditions = array('id' => $id);
     $COURSE = $DB->get_record('course', $conditions);
     if (!($forum = forum_get_course_forum($COURSE->id, 'news'))) {
         return array();
     }
     $modinfo = get_fast_modinfo($COURSE);
     if (empty($modinfo->instances['forum'][$forum->id])) {
         return array();
     }
     $cm = $modinfo->instances['forum'][$forum->id];
     /// Get all the recent discussions we're allowed to see
     if (!($discussions = forum_get_discussions($cm, 'p.modified DESC', false, -1, $COURSE->newsitems))) {
         return array();
     }
     $data = array();
     foreach ($discussions as $r) {
         $e['discussion'] = $r->discussion;
         $e['subject'] = $r->subject;
         $e['timemodified'] = $r->timemodified;
         $data[] = $e;
     }
     return $data;
 }

    /**
     * Alternative rendering of front page news, called from layout/faux_site_index.php which
     * replaces the standard news output with this.
     *
     * @return string
     */
    public function site_frontpage_news()
    {
        global $CFG, $SITE;
        require_once $CFG->dirroot . '/mod/forum/lib.php';
        if (!($forum = forum_get_course_forum($SITE->id, 'news'))) {
            print_error('cannotfindorcreateforum', 'forum');
        }
        $cm = get_coursemodule_from_instance('forum', $forum->id, $SITE->id, false, MUST_EXIST);
        $context = \context_module::instance($cm->id, MUST_EXIST);
        $output = html_writer::start_tag('div', array('id' => 'site-news-forum', 'class' => 'clearfix'));
        $output .= $this->heading(format_string($forum->name, true, array('context' => $context)));
        $groupmode = groups_get_activity_groupmode($cm, $SITE);
        $currentgroup = groups_get_activity_group($cm);
        if (!($discussions = forum_get_discussions($cm, 'p.modified DESC', true, null, $SITE->newsitems, false, -1, $SITE->newsitems))) {
            $output .= html_writer::tag('div', '(' . get_string('nonews', 'forum') . ')', array('class' => 'forumnodiscuss'));
            if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context)) {
                $output .= html_writer::link(new moodle_url('/mod/forum/post.php', array('forum' => $forum->id)), get_string('addanewtopic', 'forum'), array('class' => 'btn btn-primary'));
            } else {
                // No news and user cannot edit, so return nothing.
                return '';
            }
            return $output . '</div>';
        }
        $output .= html_writer::start_div('', array('id' => 'news-articles'));
        foreach ($discussions as $discussion) {
            if (!forum_user_can_see_discussion($forum, $discussion, $context)) {
                continue;
            }
            $message = file_rewrite_pluginfile_urls($discussion->message, 'pluginfile.php', $context->id, 'mod_forum', 'post', $discussion->id);
            $imagestyle = '';
            $imgarr = \theme_snap\local::extract_first_image($message);
            if ($imgarr) {
                $imageurl = s($imgarr['src']);
                $imagestyle = " style=\"background-image:url('{$imageurl}')\"";
            }
            $name = format_string($discussion->name, true, array('context' => $context));
            $date = userdate($discussion->timemodified, get_string('strftimedatetime', 'langconfig'));
            $readmorebtn = "<a class='btn btn-default toggle' href='" . $CFG->wwwroot . "/mod/forum/discuss.php?d=" . $discussion->discussion . "'>" . get_string('readmore', 'theme_snap') . "</a>";
            $preview = '';
            $newsimage = '';
            if (!$imagestyle) {
                $preview = html_to_text($message, 0, false);
                $preview = "<div class='news-article-preview'><p>" . shorten_text($preview, 200) . "</p>\n                <p class='text-right'>" . $readmorebtn . "</p></div>";
            } else {
                $newsimage = '<div class="news-article-image toggle"' . $imagestyle . ' title="' . get_string('readmore', 'theme_snap') . '"></div>';
            }
            $close = get_string('close', 'theme_snap');
            $output .= <<<HTML
<div class="news-article clearfix">
    {$newsimage}
    <div class="news-article-inner">
        <div class="news-article-content">
            <h3 class='toggle'><a href="{$CFG->wwwroot}/mod/forum/discuss.php?d={$discussion->discussion}">{$name}</a></h3>
            <em class="news-article-date">{$date}</em>
        </div>
    </div>
    {$preview}
    <div class="news-article-message" tabindex="-1">
        {$message}
        <div><hr><a class="snap-action-icon toggle" href="#">
        <i class="icon icon-close"></i><small>{$close}</small></a></div>
    </div>
</div>
HTML;
        }
        $actionlinks = html_writer::link(new moodle_url('/mod/forum/view.php', array('id' => $cm->id)), get_string('morenews', 'theme_snap'), array('class' => 'btn btn-default'));
        if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context)) {
            $actionlinks .= html_writer::link(new moodle_url('/mod/forum/post.php', array('forum' => $forum->id)), get_string('addanewtopic', 'forum'), array('class' => 'btn btn-primary'));
        }
        $output .= html_writer::end_div();
        $output .= "<br><div class='text-center'>{$actionlinks}</div>";
        $output .= html_writer::end_tag('div');
        return $output;
    }

 /**
  * 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.........

 /**
  * Gets the data required to fill the test plan template with the database contents.
  *
  * @param int $targetcourseid The target course id
  * @return stdClass The ids required by the test plan
  */
 protected static function get_course_test_data($targetcourseid)
 {
     global $DB, $USER;
     $data = new stdClass();
     // Getting course contents info as the current user (will be an admin).
     $course = new stdClass();
     $course->id = $targetcourseid;
     $courseinfo = new course_modinfo($course, $USER->id);
     // Getting the first page module instance.
     if (!($pages = $courseinfo->get_instances_of('page'))) {
         print_error('error_nopageinstances', 'tool_generator');
     }
     $data->pageid = reset($pages)->id;
     // Getting the first forum module instance and it's first discussion and reply as well.
     if (!($forums = $courseinfo->get_instances_of('forum'))) {
         print_error('error_noforuminstances', 'tool_generator');
     }
     $forum = reset($forums);
     // Getting the first discussion (and reply).
     if (!($discussions = forum_get_discussions($forum, 'd.timemodified ASC', false, -1, 1))) {
         print_error('error_noforumdiscussions', 'tool_generator');
     }
     $discussion = reset($discussions);
     $data->forumid = $forum->id;
     $data->forumdiscussionid = $discussion->discussion;
     $data->forumreplyid = $discussion->id;
     // According to the current test plan.
     return $data;
 }

    function get_content() {
        global $CFG, $USER,$DB;

        if ($this->content !== NULL) {
            return $this->content;
        }

        $this->content = new stdClass;
        $this->content->text = '';
        $this->content->footer = '';

        if (empty($this->instance)) {
            return $this->content;
        }


        if ($this->page->course->newsitems) {   // Create a nice listing of recent postings

            require_once($CFG->dirroot.'/mod/forum/lib.php');   // We'll need this

            $text = '';

            if (!$forum = forum_get_course_forum($this->page->course->id, 'news')) {
                return '';
            }

            $modinfo = get_fast_modinfo($this->page->course);
            if (empty($modinfo->instances['forum'][$forum->id])) {
                return '';
            }
            $cm = $modinfo->instances['forum'][$forum->id];

            if (!$cm->uservisible) {
                return '';
            }

            $context = context_module::instance($cm->id);

        /// User must have perms to view discussions in that forum
            if (!has_capability('mod/forum:viewdiscussion', $context)) {
                return '';
            }

        /// First work out whether we can post to this group and if so, include a link
            $groupmode    = groups_get_activity_groupmode($cm);
            $currentgroup = groups_get_activity_group($cm, true);


            if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context)) {
                $text .= '<div class="newlink"><a href="'.$CFG->wwwroot.'/mod/forum/post.php?forum='.$forum->id.'">'.
                          get_string('addanewtopic', 'forum').'</a></div>';
            }

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

            if (! $discussions = forum_get_discussions($cm, 'p.modified DESC', false,
                                                       $currentgroup, $this->page->course->newsitems) ) {
                $text .= '('.get_string('nonews', 'forum').')';
                $this->content->text = $text;
                return $this->content;
            }

        /// Actually create the listing now

            $strftimerecent = get_string('strftimerecent');
            $strmore = get_string('more', 'forum');

        /// Accessibility: markup as a list.
            $text .= "\n<ul class='unlist'>\n";
          
            foreach ($discussions as $discussion) {
                $discussion->subject = $discussion->name;

                $discussion->subject = format_string($discussion->subject, true, $forum->course);
                /******************code by sreekanth*****************/
                $subject1 = html_writer::tag('b',get_string('subject', 'block_site_blog'),array());
                $message = $DB->get_record_sql("SELECT * FROM {forum_posts} WHERE id = $discussion->id");
               
               
                //print_object($message);
                $text .= '<li class="post">'.
                         '<div class="head clearfix">'.
                         '<div class="date">'.userdate($discussion->modified, $strftimerecent).'</div>'.
                         '<div class="name">'.fullname($discussion).'</div></div>'.
                         '<div class="info">'.$subject1. ':  <a href="'.$CFG->wwwroot.'/mod/forum/discuss.php?d='.$discussion->discussion.'">'.$discussion->subject.'</a></div>'.
                         "</li>\n";
                 $string1= $message->message;
                 
                 //$text .= $message->message;
                 $string = strip_tags($string1);
                if (strlen($string) > 480) {
                    // truncate string
                    $stringCut = substr($string, 0, 480);
                    //print_object($stringCut);
                    // make sure it ends in a word so assassinate doesn't become ass...
                    $view = html_writer::tag('a',get_string('view', 'block_my_blog'),array('href'=>$CFG->wwwroot.'/mod/forum/discuss.php?d='.$discussion->discussion));
                    $text .= "<div class='bulletin_message'>".substr($stringCut, 0, strrpos($stringCut, ' '))."...".$view."</div>";
                } else{
                    $text .= "<div class='bulletin_message'>". $message->message ."</div>";
                }
//.........这里部分代码省略.........

 function get_content()
 {
     global $CFG, $USER, $COURSE;
     if ($this->content !== NULL) {
         return $this->content;
     }
     $this->content = new stdClass();
     $this->content->text = '';
     $this->content->footer = '';
     if (empty($this->instance)) {
         return $this->content;
     }
     if ($COURSE->newsitems) {
         // Create a nice listing of recent postings
         require_once $CFG->dirroot . '/mod/forum/lib.php';
         // We'll need this
         if (!($forum = forum_get_course_forum($COURSE->id, 'news'))) {
             return '';
         }
         $modinfo = get_fast_modinfo($COURSE);
         if (empty($modinfo->instances['forum'][$forum->id])) {
             return '';
         }
         $cm = $modinfo->instances['forum'][$forum->id];
         $context = get_context_instance(CONTEXT_MODULE, $cm->id);
         /// First work out whether we can post to this group and if so, include a link
         $groupmode = groups_get_activity_groupmode($cm);
         $currentgroup = groups_get_activity_group($cm, true);
         /// Get all the recent discussions we're allowed to see
         if (!($discussions = forum_get_discussions($cm, 'p.modified DESC', false, $currentgroup, $COURSE->newsitems))) {
             $this->content->text = '(' . get_string('nonews', 'forum') . ')';
             // add a link to add "a new news item" (nadavkav)
             if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context)) {
                 $this->content->footer = '<div class="newlink"><a href="' . $CFG->wwwroot . '/mod/forum/post.php?forum=' . $forum->id . '">' . get_string('addanewitem', 'block_news_items_scrolling') . '</a>...</div>';
             }
             return $this->content;
         }
         // add scrolling effect <marquee> (nadavkav)
         $text = '<marquee width="100%" height="120" align="right" direction="up" scrolldelay="50" scrollamount="1" onmouseout="this.start();" style="padding-top: 2px;" onmouseover="this.stop();" dir="rtl">';
         /// Actually create the listing now
         $strftimerecent = get_string('strftimerecent');
         $strmore = get_string('more', 'block_news_items_scrolling');
         /// Accessibility: markup as a list.
         $text .= "\n<ul class='unlist'>\n";
         foreach ($discussions as $discussion) {
             $discussion->subject = $discussion->name;
             $discussion->subject = format_string($discussion->subject, true, $forum->course);
             //if (! $post = forum_get_post_full($discussion->discussion)) {
             //error("Could not find the first post in this forum");
             //}
             $post = get_record("forum_posts", "discussion", $discussion->discussion);
             $text .= '<li class="post">' . '<div class="head">' . '<div class="info">' . format_text($post->message) . ' ' . '<a href="' . $CFG->wwwroot . '/mod/forum/discuss.php?d=' . $discussion->discussion . '">' . $strmore . '...</a></div>' . "</li>\n";
         }
         $text .= "</ul>\n";
         $text .= '</marquee>';
         $this->content->text = $text;
         $this->content->footer = '<a href="' . $CFG->wwwroot . '/mod/forum/view.php?f=' . $forum->id . '">' . get_string('olditems', 'block_news_items_scrolling') . '</a> ...';
         if (forum_user_can_post_discussion($forum, $currentgroup, $groupmode, $cm, $context)) {
             $this->content->footer = '<div class="newlink"><a href="' . $CFG->wwwroot . '/mod/forum/post.php?forum=' . $forum->id . '">' . get_string('addanewitem', 'block_news_items_scrolling') . '</a>...</div>';
         }
         /// If RSS is activated at site and forum level and this forum has rss defined, show link
         if (isset($CFG->enablerssfeeds) && isset($CFG->forum_enablerssfeeds) && $CFG->enablerssfeeds && $CFG->forum_enablerssfeeds && $forum->rsstype && $forum->rssarticles) {
             require_once $CFG->dirroot . '/lib/rsslib.php';
             // We'll need this
             if ($forum->rsstype == 1) {
                 $tooltiptext = get_string('rsssubscriberssdiscussions', 'forum', format_string($forum->name));
             } else {
                 $tooltiptext = get_string('rsssubscriberssposts', 'forum', format_string($forum->name));
             }
             if (empty($USER->id)) {
                 $userid = 0;
             } else {
                 $userid = $USER->id;
             }
             $this->content->footer .= '<br />' . rss_get_link($COURSE->id, $userid, 'forum', $forum->id, $tooltiptext);
         }
     }
     return $this->content;
 }

/**
 * Retrieve all dynamic files
 *
 * @return string[] The array of dynamic files
 */
function offline_get_dynamic_files()
{
    global $CFG, $COURSE, $USER, $DB;
    require_once $CFG->dirroot . '/course/lib.php';
    // Include homepage and accessible course pages
    $files = array('.', $CFG->wwwroot . '/', $CFG->wwwroot . '/index.php', $CFG->wwwroot . '/lib/offline/go_offline.js', $CFG->wwwroot . '/user/editadvanced.