question about using $this as a method in a function argument

[jonathan <news_php@xxxxxxxxxxxx>]

I have a question about using $this as an argument in a method.

I have a simple class called privatemsg and have another data class  
which it cals for doing the actual insert. Basically, I want the  
privatemsg class to pass itself as a parameter. I thought using self  
would do it but nothing seemed to happen. I passed $this as the arg  
(and am using type-hinting on the privatemsg_data class) and it  
works. To be totally honest, I have never used $this way and it looks  
a little strange / inelegant. Should I be doing this another way?  
Ultimately, I'd like to use a Domain / Mapper model but even then  
when I look at examples, I see that this takes place.

thanks,

jonathan


class PrivateMsg{
	
   private $msg_recipient_id;
   private $headline;
   private $body;
	

   //removed get's / set's for brevity

   public function insertPrivateMsg()
   {
        $privatemsg_data=new Privatemsg_Data();
        $privatemsg_data->insertMsg($this);
   }

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