Online PHP editor | refs for qkMVF

<?php class Foo { private $id = 123; public function __construct($id) { $this->id = $id; } public function getID() { return $this->id; } } class Bar extends Foo { private $what = 'running'; private $sleeping = 3; public function __sleep() { return array('sleeping'); } public function __wakeup() { $this->what = 'awake'; } } $x = new Foo(42); echo serialize($x) . "\n"; $y = new Bar(42); echo serialize($y);