function _getSource($file,$start,$end) {

      $source = @file($this->location.$file);
      if (empty($source)) return '';

      // $start is a 1 based index, need to correct to 0 based when slicing arrray
      if (!empty($start)) {
        $lines = count($source);
        if ($start > $lines) {
          $source = $this->getLang('error_start');
        } else if ($end < $start) {
          $source = $this->getLang('error_end');
        } else if ($end > $lines) {
          $source = join('',array_slice($source,$start-1));
        } else {
          $source = join('',array_slice($source,$start-1,$end-$start));
        }
      } else {
        $source = join('',$source);
      }

      $rows = explode("\n", $source);
      for($i = 0; $i <count($rows); $i++) {
          $new_text .= sprintf("%4d",($i +1)).": ".$rows[$i]."\n"; }
	  return $new_text;
    }