Online PHP editor | refs for n820F

<?php class A { } class B extends A { public self $instOfSelf; public parent $instOfParent; } $b = new B(); $b->instOfParent = new B(); # Allowed var_dump($b); $b->instOfParent = new A(); # Also allowed var_dump($b); $b->instOfSelf = new B(); # Allowed var_dump($b); $b->instOfSelf = new A(); # ERROR var_dump($b);