<?php

class OO {

var $a = 111;

var $elem = array('b' => 9, 'c' => 42);

// Callback method for getting a property

function __get($prop_name, &$prop_value)

{

if (isset($this->elem[$prop_name])){

$prop_value = $this->elem[$prop_name];

return true;

} else {

return false;

}

}

// Callback method for setting a property

function __set($prop_name, $prop_value)

{

$this->elem[$prop_name] = $prop_value;

return true;

}

}

// Here we overload the OO object

overload('OO');

$o = new OO;

echo "\$o->a: $o->a\n"; // print: $o->a: 111

echo "\$o->b: $o->b\n"; // print: $o->b: 9

echo "\$o->c: $o->c\n"; // print: $o->c: 42

echo "\$o->d: $o->d\n"; // print: $o->d:

// add a new item to the $elem array in OO

$o->x = 56;

// instantiate stdclass (it is built-in in PHP 4)

// $val is not overloaded!

$val = new stdclass;

$val->prop = 555;

// Set "a" to be an array with the $val object in it

// But __set() will put this in the $elem array

$o->a = array($val);

var_dump($o->a[0]->prop);

?>