[PHP] OBJECT��WHAT'S THE RALATION BETWEEN A,B AND C?

[bob]

<?php
class A
{
    function A($i)
    {
        $this->value = $i;
        // try to figure out why we do not need a reference here
        $this->b = new B($this);
    }

    function createRef()
    {
        $this->c = new B($this);
    }

    function echoValue()
    {
        echo "<br>","class ",get_class($this),': ',$this->value;
    }
}


class B
{
    function B(&$a)
    {
        $this->a = &$a;
    }

    function echoValue()
    {
        echo "<br>","class ",get_class($this),': ',$this->a->value;
    }
}

// try to undestand why using a simple copy here would yield
// in an undesired result in the *-marked line
$a =new A(10);
$a->createRef();

$a->echoValue();
$a->b->echoValue();
$a->c->echoValue();

$a->value = 11;

$a->echoValue();
$a->b->echoValue(); // *
$a->c->echoValue();

?>

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