Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:11998
Return-Path: <curt@php.net>
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Delivered-To: mailing list internals@lists.php.net
Received: (qmail 171 invoked by uid 1010); 8 Aug 2004 02:07:22 -0000
Delivered-To: ezmlm-scan-internals@lists.php.net
Delivered-To: ezmlm-internals@lists.php.net
Received: (qmail 146 invoked from network); 8 Aug 2004 02:07:22 -0000
Received: from unknown (HELO took.shire) (68.122.184.4)
  by pb1.pair.com with SMTP; 8 Aug 2004 02:07:22 -0000
Received: (qmail 35052 invoked by uid 1001); 8 Aug 2004 02:23:53 -0000
Date: Sun, 8 Aug 2004 02:23:53 +0000
To: internals@lists.php.net
Message-ID: <20040808022353.GG6522@bagend.shire>
Mail-Followup-To: internals@lists.php.net
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.4.1i
Subject: objects passed as reference in php5
From: curt@php.net (Curt Zirzow)


I'm trying to document how objects are passed to functions in php5,
but am running into some troubles.

In the code below the object appears to be a reference but when the
original object is destoyed it still somehow exists.  Can someone
explain how this is? I was going to report a bug on this but using
the traditional &$obj usage it works perfectly fine.

class Test {
  public $object = null;
  public $object1 = null;


  function SetVarVal($obj) {
    $this->object = $obj;
  }

  function SetVarRef(&$obj) {
    $this->object1 = &$obj;
  }

}

$obj1 = new StdClass();

$obj2 = new Test();
$obj2->SetVarVal($obj1);
$obj2->SetVarRef($obj1);


$obj1->foo = 'test';       /* show how obj1's is a ref */
$obj1 = null;              /* destroy object */

var_dump($obj2->object);  /* still has object with ->foo */
var_dump($obj2->object1); /* NULL */



Curt
-- 
First, let me assure you that this is not one of those shady pyramid schemes
you've been hearing about.  No, sir.  Our model is the trapezoid!