private function getNoteHash() { if (!$this->isNote() && !$this->isAttachment()) { trigger_error("getNoteHash() can only be called on notes and attachments", E_USER_ERROR); } if (!$this->id) { return ''; } // Store access time for later garbage collection //$this->noteAccessTime = new Date(); return Zotero_Notes::getHash($this->libraryID, $this->id); }