<?php
function test($objs)
{
 $objs->var=10;
}
class one
{
 public $var=1;
}
$obj=new one();
echo $obj->var.'<p>';
test($obj);
echo $obj->var;
exit;

...
/**
* Displays a particular model.
* @param integer $id the ID of the model to be displayed
*/
public function actionView($id)
{
  $post=$this->loadModel($id);
  $comment=$this->newComment($post);
  $this->render('view',array(
    'model'=>$post,
    'comment'=>$comment,
  ));
}
protected function newComment($post)
{
  $comment=new Comment();
  if(isset($_POST['Comment']))
  {
   $comment->attributes=$_POST['Comment'];
   if($post->addComment($comment))//==============================
   {
    if($comment->status==Comment::STATUS_PENDING)
     Yii::app()->user->setFlash('commentSubmitted','Thank you...');
    $this->refresh();
   }
  }
  return $comment;
}
...

...
public function addComment($comment)
{
  if(Yii::app()->params['commentNeedApproval'])
   $comment->status=Comment::STATUS_PENDING;
  else
   $comment->status=Comment::STATUS_APPROVED;
  $comment->post_id=$this->id;
  return $comment->save();
}
...

...
<div id="comments">
<h3>Leave a Comment</h3>
<?php if(Yii::app()->user->hasFlash('commentSubmitted')): ?>
 <div class="flash-success">
 <?php echo Yii::app()->user->getFlash('commentSubmitted'); ?>
 </div>
<?php else: ?>
 <?php $this->renderPartial('/comment/_form',array(
 'model'=>$comment,
 )); ?>
<?php endif; ?>
</div><!-- comments -->
...