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 )
?>
Hallo.
Thogh I am not really sure if this solves your problem,
but you should take a closer look at your method setChild().
Your parent-class has a property which you want to be an array.
[snip]
var $child; //array
[/snip]
But setChild() turns it into an object since the passed parameter
($child) is an object.
[snip]
$this->child=$child;
[/snip]
You should rather use something like array_push() or just
$this->child[] = $child;
Daniel
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