code: protected function sortByDate($blnAscending = true)
      {
          $arrFiles = $this->foundFiles;
          $arrDates = $this->modifiedTime;
  
          if (!$arrFiles) {
              return array('files' => array(), 'source' => array());
          }
  
          if ($blnAscending) {
              array_multisort($arrFiles, SORT_NUMERIC, $arrDates, SORT_ASC);
          } else {
              array_multisort($arrFiles, SORT_NUMERIC, $arrDates, SORT_DESC);
          }
  
          return $this->remapSorting($arrFiles, $this->outputBuffer);
      }
docs: Sort by modification time.
  
  @param boolean $blnAscending Flag to determine if sorting shall be applied ascending (default) or descending.
  
  @return array