/**
  * Marks a thread as undone.
  */
 public function markAsUndone()
 {
     // check permission
     $this->board->checkModeratorPermission('canMarkAsDoneThread');
     if ($this->thread == null) {
         throw new IllegalLinkException();
     }
     $this->thread->markAsUndone();
     exit;
 }
 /**
  * Merges posts.
  */
 public function merge()
 {
     if ($this->post === null || empty($this->postIDs)) {
         throw new IllegalLinkException();
     }
     // remove target post from source
     $postIDArray = explode(',', $this->postIDs);
     if (($key = array_search($this->post->postID, $postIDArray)) !== false) {
         unset($postIDArray[$key]);
         $this->postIDs = implode(',', $postIDArray);
     }
     // get thread ids
     $threadIDs = PostEditor::getThreadIDs($this->postIDs);
     // get boards
     list($boards, $boardIDs) = ThreadEditor::getBoards($threadIDs);
     // check permissions
     $this->board->checkModeratorPermission('canMergePost');
     foreach ($boards as $board) {
         $board->checkModeratorPermission('canMergePost');
     }
     // remove user stats
     ThreadEditor::updateUserStats($threadIDs, 'delete');
     PostEditor::updateUserStats(ThreadEditor::getAllPostIDs($threadIDs), 'delete');
     // merge posts
     PostEditor::mergeAll($this->postIDs, $this->post->postID);
     PostEditor::unmarkAll();
     // handle threads (check for empty, deleted and hidden threads)
     ThreadEditor::checkVisibilityAll($threadIDs);
     // refresh last post, replies, attachments, polls in threads
     ThreadEditor::refreshAll($threadIDs);
     // re-add user stats
     ThreadEditor::updateUserStats($threadIDs, 'enable');
     PostEditor::updateUserStats(ThreadEditor::getAllPostIDs($threadIDs), 'enable');
     // refresh counts
     BoardEditor::refreshAll($boardIDs);
     // refresh last post in boards
     $this->board->setLastPosts();
     foreach ($boards as $board) {
         $board->setLastPosts();
     }
     HeaderUtil::redirect($this->url);
     exit;
 }