class ItemUpdater {
public function update( Item $item ) {
print "updating.. ";
print $item->name;
}
}
class Item {
public $name = "item";
private $updater;
public function setUpdater( ItemUpdater $update ) {
$this->updater=$update;
}
function __destruct() {
if ( ! empty( $this->updater )) {
$this->updater->update( $this );
}
}
}
$item = new Item();
$item->setUpdater( new ItemUpdater() ) ;
unset( $item );
?>