模块来更改drupal中的视图字段值

我需要写php代码来改变我的视图的字段值。我有一个php模板文件，在主题下，代码如下:

$view = views_get_view_result("gallery");
$count = count($view);
if ($count>=1) {
  $ids = explode(",", $view[0]->nextag_items_tags);
  $tagword = "";
  foreach ($ids as $id) {
      $query = db_select('nextag_words', 'a');
      $query->fields('a', array('tagword'));
      $query->condition('a.id', $id, '=');
      $results = $query->execute()->fetchField();
      $tagword .= $results . ",";
  }
  $view[0]->nextag_words_tagword = $tagword; 
  //?????? My question is here
}

我的问题是我如何设置drupal视图的新字段值，这样显示就会改变?这件事已经困扰我很久了……

感谢大家的宝贵时间!