original_string: public function get_useridlist_key($id = null) {
          if ($id === null) {
              $id = $this->get_useridlist_key_id();
          }
          return $this->get_course_module()->id . '_' . $id;
      }
code: public function get_useridlist_key($id = null) {
          if ($id === null) {
              $id = $this->get_useridlist_key_id();
          }
          return $this->get_course_module()->id . '_' . $id;
      }
code_tokens: public function get_useridlist_key ( $ id = null ) { if ( $ id === null ) { $ id = $ this -> get_useridlist_key_id ( ) ; } return $ this -> get_course_module ( ) -> id . '_' . $ id ; }
docstring: Generates the key that should be used for an entry in the useridlist cache.
  
  @param string $id Generate a key for this instance (optional)
  @return string The key for the id, or new entry if no $id is passed.
docstring_tokens: Generates the key that should be used for an entry in the useridlist cache .