/**
  * @return bool True if read tracking is enabled for this discussion
  *   (it is not too old, and read tracking is turned on globally)
  */
 public function is_read_tracked()
 {
     $this->check_full();
     return forum::enabled_read_tracking() && $this->discussionfields->timemodified >= forum::get_read_tracking_deadline();
 }
 /**
  * Splits this post to become a new discussion
  * @param $newsubject
  * @param bool $log True to log action
  * @return int ID of new discussion
  */
 function split($newsubject, $log = true)
 {
     global $CFG;
     $this->require_children();
     // Begin a transaction
     forum_utils::start_transaction();
     $olddiscussion = $this->get_discussion();
     // Create new discussion
     $newest = null;
     $this->find_newest_child($newest);
     $newdiscussionid = $olddiscussion->clone_for_split($this->get_id(), $newest->get_id());
     // Update all child posts
     $list = array();
     $this->list_child_ids($list);
     unset($list[0]);
     // Don't include this post itself
     if (count($list) > 0) {
         $inorequals = forum_utils::in_or_equals($list);
         forum_utils::execute_sql("\nUPDATE\n    {$CFG->prefix}forumng_posts\nSET\n    discussionid = {$newdiscussionid}\nWHERE\n    id {$inorequals}");
     }
     // Update this post
     $changes = new stdClass();
     $changes->id = $this->get_id();
     $changes->subject = addslashes($newsubject);
     $changes->parentpostid = null;
     //When split the post, reset the important to 0 so that it is not highlighted.
     $changes->important = 0;
     // Note don't update modified time, or it makes this post unread,
     // which isn't very helpful
     $changes->discussionid = $newdiscussionid;
     forum_utils::update_record('forumng_posts', $changes);
     // Update read data if relevant
     if (forum::enabled_read_tracking() && $newest->get_modified() >= forum::get_read_tracking_deadline()) {
         $rs = forum_utils::get_recordset_sql("\nSELECT\n    userid, time\nFROM\n    {$CFG->prefix}forumng_read\nWHERE\n    discussionid = " . $olddiscussion->get_id() . "\n    AND time >= " . $this->get_created());
         while ($rec = rs_fetch_next_record($rs)) {
             $rec->discussionid = $newdiscussionid;
             forum_utils::insert_record('forumng_read', $rec);
         }
         rs_close($rs);
     }
     $olddiscussion->possible_lastpost_change();
     // Move attachments
     $olddiscussionfolder = $olddiscussion->get_attachment_folder();
     $newdiscussionfolder = $olddiscussion->get_attachment_folder(0, 0, $newdiscussionid);
     if (is_dir($olddiscussionfolder)) {
         // Put this post back on the list
         $list[0] = $this->get_id();
         // Loop through all posts; move attachments if present
         $madenewfolder = false;
         foreach ($list as $id) {
             $oldfolder = $olddiscussionfolder . '/' . $id;
             $newfolder = $newdiscussionfolder . '/' . $id;
             if (is_dir($oldfolder)) {
                 if (!$madenewfolder) {
                     check_dir_exists($newfolder, true, true);
                     $madenewfolder = true;
                 }
                 forum_utils::rename($oldfolder, $newfolder);
             }
         }
     }
     if ($log) {
         $this->log('split post');
     }
     forum_utils::finish_transaction();
     $this->get_discussion()->uncache();
     // If discussion-based completion is turned on, this may enable someone
     // to complete
     if ($this->get_forum()->get_completion_discussions()) {
         $this->update_completion(true);
     }
     return $newdiscussionid;
 }