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<?php class A { public function serialize () { $serialized = array(); foreach($this as $prop => $val) { $serialized[$prop] = $val; } return serialize($serialized); return serialize(get_object_vars($this)); } function unserialize($serialized) { foreach(unserialize($serialized) as $prop => $val) { $this->$prop = $val; } return true; } } class B extends A { public $A; } class C extends A { public $A; public $B; } $oC = new C(); $oC->A = new A(); $oC->B = new B(); $oC->B->A = $oC->A; echo $oC->A === $oC->B->A ? "yes" : "no", "\n"; echo serialize($oC->A) === serialize($oC->B->A) ? 'yes' : 'no', "\n"; $ser = serialize($oC); echo $ser, "\n"; $new_oC = unserialize($ser); echo $new_oC->A === $new_oC->B->A ? "yes" : "no", "\n";
Output for git.master, git.master_jit, rfc.property-hooks
yes yes O:1:"C":2:{s:1:"A";O:1:"A":0:{}s:1:"B";O:1:"B":1:{s:1:"A";r:2;}} yes

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