--TEST-- Object test, cyclic references --SKIPIF-- parent = null; $this->children = array(); } public function addChild(Foo $obj) { $this->children[] = $obj; $obj->setParent($this); } public function setParent(Foo $obj) { $this->parent = $obj; } } error_reporting(E_ALL); $obj1 = new Foo(); for ($i = 0; $i < 10; $i++) { $obj = new Foo(); $obj1->addChild($obj); } $o = igbinary_unserialize(igbinary_serialize($obj1->children)); foreach ($obj1->children as $k => $v) { $obj_v = $v; $o_v = $o[$k]; echo gettype($obj_v), "\t", gettype($o_v), "\n"; } --EXPECT-- object object object object object object object object object object object object object object object object object object object object