[PHP] Re: problem with embeded objects and reference

[Red Wingate]

Not sure over here, but isn't it

$main->setChild(&$child1);

Vincent Dupont wrote:

Hi,

could anyone help on this 'by reference' problem.
I have 2 classes. The main class as a child class.
The child class has properties (array)
I would like to be able to manipulate the child's properties even after the child has 
been inserted into the main class.

Does this make sense?

I can do it with by getting a reference of the child class, then setting the 
property,like :
        $tmp = & $main->getChild(); //get a reference to the child object
        $tmp->setProperty("forth");//ok
OR
        $main->setChildProperty("third"); //ok

but Whyt can't I do it directly by calling a reference to the child, like in :
$child1->setproperty("second"); //The property is not set or not displayed
I know I need a reference to the child class that is within the maoin class, but HOW??

Here is a complete example

<?php

class class1{
var $child; //array

function class1(){
$this->properties = array();
}

//set the child object (class2)
function & setChild($child){
$this->child=$child;
}

//get the child object (class2), and call its setProperty method
function setChildProperty($prop){ $theChild = & $this->child;
$theChild->setProperty($prop);
}

//return a reference to the child object
function & getChild(){
return $this->child;
}

//print the child object properties
function display(){
$this->child->toString();
}

}

class class2{
var $properties; //array
        
        function class2(){
                $this->properties = array();
        }
        
        function & setProperty($new_property){
                $this->properties[] = $new_property;
        }
        
        function & getProperty($index){
                return $this->properties[$index];
        }
        
        function toString(){
                print_r($this->properties);
        }
}

$main = & new class1();

$child1 = & new class2();
$child1->setproperty("first");//displayed

$main->setChild($child1);

$child1->setproperty("second"); //NOT DISPLAYED
$main->setChildProperty("third"); //displayed
$tmp = & $main->getChild(); //get a reference to the child object
$tmp->setProperty("forth");//displayed

$main->display();
//output : Array ( [0] => first [1] => third [2] => forth ) ?>

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