Referenced Object Copy trouble

[ElChupacabra]

Hi, guys.
Here is my trouble, this code do not reacts like expected.
I expect the get_warning method to output 4 array, but it only output 3.

<?php

class formgen extends forminfo{

function formgen(){
    $this->forminfo();
}

function applyform(){
    $this->action->actions->doit();
}
}

class forminfo {

var $action;
var $fields;
var $warning;

var $myself;

function forminfo(){
    $this->myself = & $this;
    $this->action = new formaction();
    $this->action->loadactions(& $this);
    $this->fields = new fieldinfo();
    $this->fields->init(& $this);
}

function addwarn($msg){
    $this->warning[] = $msg;
}

function get_warning(){
    //hmmmmm empty why?
    echo 'INFO_WARN => <pre>';print_r($this->warning);echo '</pre>';
    echo 'INFO_MYSELF_WARN => <pre>';print_r($this->myself->warning);echo '</pre>';
    echo 'FIELD_WARN => <pre>';print_r($this->fields->infos->warning);echo '</pre>';
    echo 'ACTION_WARN => <pre>';print_r($this->action->infos->warning);echo '</pre>';
}
}

class fieldinfo {

var $infos;

function fieldinfo(){}

function init(& $infos){
    $this->infos = & $infos;
}
}

class formaction {

var $infos;
var $actions;    

function formaction(){}

function loadactions(& $infos){
    $this->infos = & $infos;
    $this->actions = new DB_action();
    $this->actions->init(& $infos );
}

}

class DB_action extends formaction {

function DB_action(){
    $this->formaction();
}


function init(& $infos ){
    $this->infos = & $infos;
}

function doit(){
    $this->infos->addwarn('should be seen everywhere');
}
}

$obj = new formgen();
$obj->applyform();
$obj->get_warning();
?> 

Here it looks, like only the refenced copy is updated by the addwarn call but not the original object that is the source of all ref copy.
Well, I can get arround this by doing something not really nice ( $this->myself = & $this ).

If someone, can explain me why $this->warning (in forminfo object) is empty.