Online PHP editor | refs for FjJmf

<?php class Widget implements Serializable { public $references = array(); public $config; public function serialize() { $vars = get_object_vars($this); $vars['config'] = serialize($vars['config']); $serialized = serialize($vars); return $serialized; } public function unserialize($serialized) { $array = unserialize($serialized); $array['config'] = unserialize($array['config']); foreach($array as $k => $v) { $this->$k = $v; } } } class Placeholder { public $id; public function __construct($id) { $this->id = $id; } } $collection = array(); $placeholder1 = new Placeholder(1); $placeholder2 = new Placeholder(2); $widget1 = new Widget; $widget1->config = array('id_section' => 9); $widget1->references[] = $placeholder1; $widget2 = new Widget; $widget2->config = array('id_section' => 9); $widget2->references[] = $placeholder2; $widget3 = new Widget; $widget3->config = array('id_section' => 9); $widget3->references[] = $placeholder1; $widget4 = new Widget; $widget4->config = array('id_section' => 9); $widget4->references[] = $placeholder1; $collection[] = $widget1; $collection[] = $widget2; $collection[] = $widget3; // reference to placeholder will be missing here $collection[] = $widget4; // reference to placeholder will be missing here print_r(unserialize(serialize($collection)));