public function get_discussionid($forumdata)
 {
     list($querystrid, $discussionid, $reply, $edit, $delete) = explode('_', $forumdata);
     if (empty($discussionid)) {
         $parent = '';
         if ($reply != 0) {
             $parent = forum_get_post_full($reply);
         } else {
             if ($edit != 0) {
                 $parent = forum_get_post_full($edit);
             } else {
                 if ($delete != 0) {
                     $parent = forum_get_post_full($delete);
                 }
             }
         }
         if (!empty($parent)) {
             $discussionid = $parent->discussion;
         }
     }
     return $discussionid;
 }

$event->add_record_snapshot('forum', $forum);
$event->trigger();
unset($SESSION->fromdiscussion);
if ($mode) {
    set_user_preference('forum_displaymode', $mode);
}
$displaymode = get_user_preferences('forum_displaymode', $CFG->forum_displaymode);
if ($parent) {
    // If flat AND parent, then force nested display this time
    if ($displaymode == FORUM_MODE_FLATOLDEST or $displaymode == FORUM_MODE_FLATNEWEST) {
        $displaymode = FORUM_MODE_NESTED;
    }
} else {
    $parent = $discussion->firstpost;
}
if (!($post = forum_get_post_full($parent))) {
    print_error("notexists", 'forum', "{$CFG->wwwroot}/mod/forum/view.php?f={$forum->id}");
}
if (!forum_user_can_see_post($forum, $discussion, $post, null, $cm)) {
    print_error('noviewdiscussionspermission', 'forum', "{$CFG->wwwroot}/mod/forum/view.php?id={$forum->id}");
}
if ($mark == 'read' or $mark == 'unread') {
    if ($CFG->forum_usermarksread && forum_tp_can_track_forums($forum) && forum_tp_is_tracked($forum)) {
        if ($mark == 'read') {
            forum_tp_add_read_record($USER->id, $postid);
        } else {
            // unread
            forum_tp_delete_read_records($USER->id, $postid);
        }
    }
}

 /**
  * Returns the specified forum post from its internal cache.
  *
  * @throws \dml_missing_record_exception
  * @param int $postid
  * @return stdClass
  */
 protected function get_post($postid)
 {
     if (empty($this->postsdata[$postid])) {
         $this->postsdata[$postid] = forum_get_post_full($postid);
         if (!$this->postsdata[$postid]) {
             throw new \dml_missing_record_exception('forum_posts');
         }
     }
     return $this->postsdata[$postid];
 }

                 $forumtracked = forum_tp_is_tracked($forum);
                 $posts = forum_get_all_discussion_posts($discussion->id, "created ASC", $forumtracked);
                 forum_print_posts_nested($course, $cm, $forum, $discussion, $post, false, false, $forumtracked, $posts);
             }
         } else {
             echo $OUTPUT->header();
             echo $OUTPUT->confirm(get_string("deletesure", "forum", $replycount), "post.php?delete={$delete}&confirm={$delete}", $CFG->wwwroot . '/mod/forum/discuss.php?d=' . $post->discussion . '#p' . $post->id);
             forum_print_post($post, $discussion, $forum, $cm, $course, false, false, false);
         }
     }
     echo $OUTPUT->footer();
     die;
 } else {
     if (!empty($prune)) {
         // Pruning
         if (!($post = forum_get_post_full($prune))) {
             print_error('invalidpostid', 'forum');
         }
         if (!($discussion = $DB->get_record("forum_discussions", array("id" => $post->discussion)))) {
             print_error('notpartofdiscussion', 'forum');
         }
         if (!($forum = $DB->get_record("forum", array("id" => $discussion->forum)))) {
             print_error('invalidforumid', 'forum');
         }
         if ($forum->type == 'single') {
             print_error('cannotsplit', 'forum');
         }
         if (!$post->parent) {
             print_error('alreadyfirstpost', 'forum');
         }
         if (!($cm = get_coursemodule_from_instance("forum", $forum->id, $forum->course))) {

 /**
  * Returns a list of forum posts for a discussion
  *
  * @param int $discussionid the post ids
  * @param string $sortby sort by this element (id, created or modified)
  * @param string $sortdirection sort direction: ASC or DESC
  *
  * @return array the forum post details
  * @since Moodle 2.7
  */
 public static function get_forum_discussion_posts($discussionid, $sortby = "created", $sortdirection = "DESC")
 {
     global $CFG, $DB, $USER;
     $warnings = array();
     // Validate the parameter.
     $params = self::validate_parameters(self::get_forum_discussion_posts_parameters(), array('discussionid' => $discussionid, 'sortby' => $sortby, 'sortdirection' => $sortdirection));
     // Compact/extract functions are not recommended.
     $discussionid = $params['discussionid'];
     $sortby = $params['sortby'];
     $sortdirection = $params['sortdirection'];
     $sortallowedvalues = array('id', 'created', 'modified');
     if (!in_array($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));
     }
     $discussion = $DB->get_record('forum_discussions', array('id' => $discussionid), '*', MUST_EXIST);
     $forum = $DB->get_record('forum', array('id' => $discussion->forum), '*', 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);
     // This require must be here, see mod/forum/discuss.php.
     require_once $CFG->dirroot . "/mod/forum/lib.php";
     // Check they have the view forum capability.
     require_capability('mod/forum:viewdiscussion', $modcontext, null, true, 'noviewdiscussionspermission', 'forum');
     if (!($post = forum_get_post_full($discussion->firstpost))) {
         throw new moodle_exception('notexists', 'forum');
     }
     // This function check groups, qanda, timed discussions, etc.
     if (!forum_user_can_see_post($forum, $discussion, $post, null, $cm)) {
         throw new moodle_exception('noviewdiscussionspermission', 'forum');
     }
     $canviewfullname = has_capability('moodle/site:viewfullnames', $modcontext);
     // We will add this field in the response.
     $canreply = forum_user_can_post($forum, $discussion, $USER, $cm, $course, $modcontext);
     $forumtracked = forum_tp_is_tracked($forum);
     $sort = 'p.' . $sortby . ' ' . $sortdirection;
     $posts = forum_get_all_discussion_posts($discussion->id, $sort, $forumtracked);
     foreach ($posts as $pid => $post) {
         if (!forum_user_can_see_post($forum, $discussion, $post, null, $cm)) {
             $warning = array();
             $warning['item'] = 'post';
             $warning['itemid'] = $post->id;
             $warning['warningcode'] = '1';
             $warning['message'] = 'You can\'t see this post';
             $warnings[] = $warning;
             continue;
         }
         // Function forum_get_all_discussion_posts adds postread field.
         // Note that the value returned can be a boolean or an integer. The WS expects a boolean.
         if (empty($post->postread)) {
             $posts[$pid]->postread = false;
         } else {
             $posts[$pid]->postread = true;
         }
         $posts[$pid]->canreply = $canreply;
         if (!empty($posts[$pid]->children)) {
             $posts[$pid]->children = array_keys($posts[$pid]->children);
         } else {
             $posts[$pid]->children = array();
         }
         $user = new stdclass();
         $user = username_load_fields_from_object($user, $post);
         $posts[$pid]->userfullname = fullname($user, $canviewfullname);
         $posts[$pid] = (array) $post;
     }
     $result = array();
     $result['posts'] = $posts;
     $result['warnings'] = $warnings;
     return $result;
 }

    /**
     * Create new posts into an existing discussion.
     *
     * @param int $postid the post id we are going to reply to
     * @param string $subject new post subject
     * @param string $message new post message (only html format allowed)
     * @param array $options optional settings
     * @return array of warnings and the new post id
     * @since Moodle 3.0
     * @throws moodle_exception
     */
    public static function add_discussion_post($postid, $subject, $message, $options = array()) {
        global $DB, $CFG, $USER;
        require_once($CFG->dirroot . "/mod/forum/lib.php");

        $params = self::validate_parameters(self::add_discussion_post_parameters(),
                                            array(
                                                'postid' => $postid,
                                                'subject' => $subject,
                                                'message' => $message,
                                                'options' => $options
                                            ));
        // Validate options.
        $options = array(
            'discussionsubscribe' => true
        );
        foreach ($params['options'] as $option) {
            $name = trim($option['name']);
            switch ($name) {
                case 'discussionsubscribe':
                    $value = clean_param($option['value'], PARAM_BOOL);
                    break;
                default:
                    throw new moodle_exception('errorinvalidparam', 'webservice', '', $name);
            }
            $options[$name] = $value;
        }

        $warnings = array();

        if (!$parent = forum_get_post_full($params['postid'])) {
            throw new moodle_exception('invalidparentpostid', 'forum');
        }

        if (!$discussion = $DB->get_record("forum_discussions", array("id" => $parent->discussion))) {
            throw new moodle_exception('notpartofdiscussion', 'forum');
        }

        // Request and permission validation.
        $forum = $DB->get_record('forum', array('id' => $discussion->forum), '*', MUST_EXIST);
        list($course, $cm) = get_course_and_cm_from_instance($forum, 'forum');

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

        if (!forum_user_can_post($forum, $discussion, $USER, $cm, $course, $context)) {
            throw new moodle_exception('nopostforum', 'forum');
        }

        $thresholdwarning = forum_check_throttling($forum, $cm);
        forum_check_blocking_threshold($thresholdwarning);

        // Create the post.
        $post = new stdClass();
        $post->discussion = $discussion->id;
        $post->parent = $parent->id;
        $post->subject = $params['subject'];
        $post->message = $params['message'];
        $post->messageformat = FORMAT_HTML;   // Force formatting for now.
        $post->messagetrust = trusttext_trusted($context);
        $post->itemid = 0;

        if ($postid = forum_add_new_post($post, null)) {

            $post->id = $postid;

            // Trigger events and completion.
            $params = array(
                'context' => $context,
                'objectid' => $post->id,
                'other' => array(
                    'discussionid' => $discussion->id,
                    'forumid' => $forum->id,
                    'forumtype' => $forum->type,
                )
            );
            $event = \mod_forum\event\post_created::create($params);
            $event->add_record_snapshot('forum_posts', $post);
            $event->add_record_snapshot('forum_discussions', $discussion);
            $event->trigger();

            // Update completion state.
            $completion = new completion_info($course);
            if ($completion->is_enabled($cm) &&
                    ($forum->completionreplies || $forum->completionposts)) {
                $completion->update_state($cm, COMPLETION_COMPLETE);
            }

            $settings = new stdClass();
            $settings->discussionsubscribe = $options['discussionsubscribe'];
//.........这里部分代码省略.........

function leaf_get_newsitem($d)
{
    global $DB, $USER, $CFG, $OUTPUT;
    static $str;
    require_once $CFG->libdir . '/filelib.php';
    $discussion = $DB->get_record('forum_discussions', array('id' => $d, 'course' => 1), '*', MUST_EXIST);
    $course = $DB->get_record('course', array('id' => $discussion->course), '*', MUST_EXIST);
    $forum = $DB->get_record('forum', array('id' => $discussion->forum), '*', MUST_EXIST);
    $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
    $parent = $discussion->firstpost;
    $post = forum_get_post_full($parent);
    $displaymode = -1;
    $canreply = false;
    $canrate = false;
    $sort = "p.created ASC";
    $posts = forum_get_all_discussion_posts($discussion->id, $sort, false);
    foreach ($posts as $post) {
        $post->course = $course->id;
        $post->forum = $forum->id;
        $postuser = new stdClass();
        $postuser->id = $post->userid;
        $postuser->firstname = $post->firstname;
        $postuser->lastname = $post->lastname;
        $postuser->imagealt = $post->imagealt;
        $postuser->picture = $post->picture;
        $postuser->email = $post->email;
        $postuser->fullname = fullname($postuser);
        $output = '';
        $output .= html_writer::tag('a', '', array('id' => 'p' . $post->id));
        $output .= html_writer::start_tag('div', array('class' => 'forumpost clearfix firstpost starter'));
        $output .= html_writer::start_tag('div', array('class' => 'row header clearfix'));
        $output .= html_writer::start_tag('div', array('class' => 'left picture'));
        $output .= $OUTPUT->user_picture($postuser, array('courseid' => $course->id));
        $output .= html_writer::end_tag('div');
        $output .= html_writer::start_tag('div', array('class' => 'topic  firstpost starter'));
        $postsubject = $post->subject;
        if (empty($post->subjectnoformat)) {
            $postsubject = format_string($postsubject);
        }
        $output .= html_writer::tag('div', $postsubject, array('class' => 'subject'));
        $output .= html_writer::tag('div', $postuser->fullname, array('class' => 'author'));
        $output .= html_writer::end_tag('div');
        //topic
        $output .= html_writer::end_tag('div');
        //row
        $output .= html_writer::start_tag('div', array('class' => 'row maincontent clearfix'));
        $output .= html_writer::start_tag('div', array('class' => 'left'));
        $output .= html_writer::tag('div', ' ', array('class' => 'grouppictures'));
        $output .= html_writer::end_tag('div');
        //left side
        $output .= html_writer::start_tag('div', array('class' => 'no-overflow'));
        $output .= html_writer::start_tag('div', array('class' => 'content'));
        $options = new stdClass();
        $options->para = false;
        $options->trusted = $post->messagetrust;
        // Prepare whole post
        $postclass = 'fullpost';
        $postcontent = format_text($post->message, $post->messageformat, $options, $course->id);
        // Output the post content
        $output .= html_writer::tag('div', $postcontent, array('class' => 'posting ' . $postclass));
        $output .= html_writer::end_tag('div');
        // Content
        $output .= html_writer::end_tag('div');
        // Content mask
        $output .= html_writer::end_tag('div');
        // Row
        $output .= html_writer::start_tag('div', array('class' => 'row side'));
        $output .= html_writer::tag('div', ' ', array('class' => 'left'));
        $output .= html_writer::start_tag('div', array('class' => 'options clearfix'));
        // Close remaining open divs
        $output .= html_writer::end_tag('div');
        // content
        $output .= html_writer::end_tag('div');
        // row
        $output .= html_writer::end_tag('div');
        // forumpost
        echo $output;
    }
}

 /**
  * Makes the pop up contents for the grading interface
  *
  * @param array $params
  * @param $coursemodule
  * @global moodle_database $DB
  * @global $PAGE
  * @global stdClass $CFG
  * @global $SESSION
  * @global $USER
  * @global $OUTPUT
  * @params object $coursemodule
  * @return string HTML
  */
 public function grading_popup($params, $coursemodule)
 {
     global $DB, $PAGE, $CFG, $SESSION, $USER, $OUTPUT;
     $output = '';
     // Lifted from /mod/forum/discuss.php...
     /*
      $parent = $params['parent'];       // If set, then display this post and all children.
      $mode   = $params['mode'];         // If set, changes the layout of the thread
      $move   = $params['move'];         // If set, moves this discussion to another forum
      $mark   = $params['mark'];       // Used for tracking read posts if user initiated.
      $postid = $params['postid'];       // Used for tracking read posts if user initiated.
     */
     $discussion = $DB->get_record('forum_discussions', array('id' => $params['discussionid']), '*', MUST_EXIST);
     $course = $DB->get_record('course', array('id' => $discussion->course), '*', MUST_EXIST);
     $forum = $DB->get_record('forum', array('id' => $discussion->forum), '*', MUST_EXIST);
     $cm = get_coursemodule_from_instance('forum', $forum->id, $course->id, false, MUST_EXIST);
     $modcontext = context_module::instance($cm->id);
     // Security - cmid is used to check context permissions earlier on, so it must match when
     // derived from the discussion.
     if (!($cm->id == $params['coursemoduleid'])) {
         print_error('Bad params!');
         return false;
     }
     // Add ajax-related libs.
     $PAGE->requires->yui2_lib('event');
     $PAGE->requires->yui2_lib('connection');
     $PAGE->requires->yui2_lib('json');
     // Move this down fix for MDL-6926.
     require_once $CFG->dirroot . '/mod/forum/lib.php';
     // Restrict news forums - should not be graded.
     if ($forum->type == 'news') {
         print_error('invaliddiscussionid', 'forum', "{$CFG->wwwroot}/mod/forum/view.php?f={$forum->id}");
     }
     unset($SESSION->fromdiscussion);
     // In case the user has used the drop-down to change from threaded to flat or something.
     if (isset($params['mode'])) {
         set_user_preference('forum_displaymode', $params['mode']);
     }
     $displaymode = get_user_preferences('forum_displaymode', $CFG->forum_displaymode);
     $parent = $discussion->firstpost;
     $post = forum_get_post_full($parent);
     if (!$post) {
         print_error("notexists", 'forum', "{$CFG->wwwroot}/mod/forum/view.php?f={$forum->id}");
     }
     if (!forum_user_can_view_post($post, $course, $cm, $forum, $discussion)) {
         print_error('nopermissiontoview', 'forum', "{$CFG->wwwroot}/mod/forum/view.php?id={$forum->id}");
     }
     // For now, restrict to rating only.
     $canreply = false;
     // Without this, the nesting doesn't work properly as the css isn't picked up.
     $output .= html_writer::start_tag('div', array('class' => 'path-mod-forum'));
     $output .= html_writer::start_tag('div', array('class' => 'discussioncontrols clearfix'));
     $output .= html_writer::start_tag('div', array('class' => 'discussioncontrol displaymode'));
     // We don't want to have the current mode returned in the url as well as the new one.
     unset($params['mode']);
     $newurl = new moodle_url('/blocks/ajax_marking/actions/grading_popup.php', $params);
     $select = new single_select($newurl, 'mode', forum_get_layout_modes(), $displaymode, null, "mode");
     $output .= $OUTPUT->render($select);
     $output .= html_writer::end_tag('div');
     // If user has not already posted and it's a Q & A forum...
     $forumisqanda = $forum->type == 'qanda';
     $noviewwithoutposting = !has_capability('mod/forum:viewqandawithoutposting', $modcontext);
     $hasnotposted = !forum_user_has_posted($forum->id, $discussion->id, $USER->id);
     if ($forumisqanda && $noviewwithoutposting && $hasnotposted) {
         $output .= $OUTPUT->notification(get_string('qandanotify', 'forum'));
     }
     $canrate = has_capability('mod/forum:rate', $modcontext);
     ob_start();
     forum_print_discussion($course, $cm, $forum, $discussion, $post, $displaymode, $canreply, $canrate);
     $output .= ob_get_contents();
     ob_end_clean();
     $output .= html_writer::end_tag('div');
     $output .= html_writer::end_tag('div');
     return $output;
 }

//.........这里部分代码省略.........
             }
         } else {
             if (!empty($linkarray["content"])) {
                 // Get turnitin text content details.
                 $submissiontype = $cm->modname == "forum" ? 'forum_post' : 'text_content';
                 switch ($cm->modname) {
                     case 'assign':
                         $moodletextsubmission = $DB->get_record('assignsubmission_onlinetext', array('submission' => $submission->id), 'onlinetext');
                         if (empty($moodletextsubmission)) {
                             $content = '';
                             $submission_status = false;
                         } else {
                             $content = $moodletextsubmission->onlinetext;
                         }
                         break;
                     case 'workshop':
                         $submission = $DB->get_record('workshop_submissions', array('authorid' => $linkarray["userid"], 'workshopid' => $moduledata->id));
                         $content = $linkarray["content"];
                         break;
                     case 'forum':
                         static $discussionid;
                         // Use query string id to check whether we are on forum home page.
                         $querystrid = optional_param('id', 0, PARAM_INT);
                         // Work out the discussion id from query string.
                         if (empty($discussionid)) {
                             $discussionid = optional_param('d', 0, PARAM_INT);
                         }
                         if (empty($discussionid)) {
                             $reply = optional_param('reply', 0, PARAM_INT);
                             $edit = optional_param('edit', 0, PARAM_INT);
                             $delete = optional_param('delete', 0, PARAM_INT);
                             $parent = '';
                             if ($reply != 0) {
                                 $parent = forum_get_post_full($reply);
                             } else {
                                 if ($edit != 0) {
                                     $parent = forum_get_post_full($edit);
                                 } else {
                                     if ($delete != 0) {
                                         $parent = forum_get_post_full($delete);
                                     }
                                 }
                             }
                             if (!empty($parent)) {
                                 $discussionid = $parent->discussion;
                             }
                         }
                         // Some forum types don't pass in certain values on main forum page.
                         if ((empty($discussionid) || $querystrid != 0) && ($forum->type == 'blog' || $forum->type == 'single')) {
                             if (!($discussion = $DB->get_record_sql('SELECT FD.id
                                                                 FROM {forum_posts} FP JOIN {forum_discussions} FD
                                                                 ON FP.discussion = FD.id
                                                                 WHERE FD.forum = ? AND FD.course = ?
                                                                 AND FP.userid = ? AND FP.message LIKE ? ', array($forum->id, $forum->course, $linkarray["userid"], $linkarray["content"])))) {
                                 print_error('notpartofdiscussion', 'forum');
                             }
                             $discussionid = $discussion->id;
                         }
                         $submission = $DB->get_record_select('forum_posts', " userid = ? AND message LIKE ? AND discussion = ? ", array($linkarray["userid"], $linkarray["content"], $discussionid));
                         $itemid = $submission->id;
                         $submission->timemodified = $submission->modified;
                         $content = $linkarray["content"];
                         break;
                 }
                 // Get plagiarism file info.
                 $identifier = sha1($content);