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Bug #26364 initializing class in other class vars value problem
Submitted: 2003-11-23 10:02 UTC Modified: 2003-11-24 05:08 UTC
From: brightone at o2 dot pl Assigned:
Status: Not a bug Package: Class/Object related
PHP Version: 4.3.4 OS: windows xp
Private report: No CVE-ID: None
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From: brightone at o2 dot pl
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 [2003-11-23 10:02 UTC] brightone at o2 dot pl 
Description:
------------
You have two classes, one initialized in another's contructor. After initializing the "child" class in "mother" constructor, all new values assigned to variables in mother are not visible in pointed classes.

Reproduce code:
---------------
<? class a{
  var $temp;
  var $pointer;
  function a(){
    $this->temp=10;
    $this->pointer=new b(&$this);
    $this->temp=20;
    echo " A: ".$this->temp;
  }
}
class b{
  var $root;
  function b($root){
    $this->root=$root;
  }
  function show_val(){ 
    echo " B: ".$this->root->temp;
}
}
$r=new a;
$r->pointer->show_val();  ?>

Expected result:
----------------
A: 20 B: 20

Actual result:
--------------
A: 20 B: 10

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 [2003-11-23 21:26 UTC] sniper@php.net 
Change this:
 $this->root=$root;
To:
 $this->root =& $root;

and it'll work.
 [2003-11-24 05:02 UTC] brightone at o2 dot pl 
Okay, you're right here, my mistake. But there is a bug anyway, I'll show it on little bigger example:

<? class a{
  var $temp;
  var $p_a;
  var $p_b;
  function a(){
    $this->p_b=new b(&$this);
    $this->p_c=new c(&$this);
  }

  function do_all(){
    $this->p_c->give_val();
    $this->p_b->show_val_c();
    echo " a: ".$this->p_c->something;
  }
}

class b{
  var $root;
  function b($root){
    $this->root=&$root;
  }
  function show_val_c(){
    echo " b: ".$this->root->p_c->something;
}
}

class c{
  var $root;
  var $something;
  function b($root){
    $this->root=&$root;
  }
  function give_val(){
    $this->something="something";
}
}

$r=new a;
$r->do_all();  ?>

Obviously, we want to see here "b: something b: something", but all we get is "b: a: something"
 [2003-11-24 05:08 UTC] brightone at o2 dot pl 
There is a little mistake in a the code above, here it goes:

<? class a{
  var $temp;
  var $p_b;
  var $p_c;
  function a(){
    $this->p_b=new b(&$this);
    $this->p_c=new c(&$this);
  }

  function do_all(){
    $this->p_c->give_val();
    $this->p_b->show_val_c();
    echo " a: ".$this->p_c->something;
  }
}

class b{
  var $root;
  function b($root){
    $this->root=&$root;
  }
  function show_val_c(){
    echo " b: ".$this->root->p_c->something;
}
}

class c{
  var $root;
  var $something;
  function b($root){
    $this->root=&$root;
  }
  function give_val(){
    $this->something="something";
}
}

$r=new a;
$r->do_all();  ?>
 
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