Yii如何过滤不良代码

public function actionCreate()
{
  $model=new News;
  $purifier = new CHtmlPurifier();
  $purifier->options = array(
    'URI.AllowedSchemes'=>array(
              'http' => true,
              'https' => true,
    ),
       'HTML.Allowed'=>'p',
  );
  if(isset($_POST['News']))
  {
    $model->attributes=$_POST['News'];
    $model->attributes['content'] = $purifier->purify($model->attributes['content']);
    if($model->save())
      $this->redirect(array('view','id'=>$model->id));
  }
}

protected function beforeSave()
{
  $purifier = new CHtmlPurifier();
  $purifier->options = array(
    'URI.AllowedSchemes'=>array(
              'http' => true,
              'https' => true,
    ),
       'HTML.Allowed'=>'p',
  );
  if(parent::beforeSave()){
    if($this->isNewRecord){
      $this->create_data = date('y-m-d H:m:s');
      $this->content = $purifier->purify($this->content);
    }
    return true;
  }else{
    return false;
  }
}

public function filters()
{
  return array(
    'accessControl', // perform access control for CRUD operations
    'postOnly + delete', // we only allow deletion via POST request
    'purifier + create', //载入插入页面时进行些过滤操作
  );
}
public function filterPurifier($filterChain){
  $purifier = new CHtmlPurifier();
  $purifier->options = array(
    'URI.AllowedSchemes'=>array(
              'http' => true,
              'https' => true,
    ),
       'HTML.Allowed'=>'p',
  );
  if(isset($_POST['news']){
    $_POST['news']['content'] = $purify($_POST['news']['content']);
  }
    $filterChain->run();
}

<?php $this->beginWidget('CHtmlPurifier'); ?>
...display user-entered content here...
<?php $this->endWidget(); ?>