Online PHP editor | refs for 2qeIS

<?php class A { } class B extends A { public parent $instOfParent; # equivalent to "public A $instOfParent" } class C extends B { } class Beta extends A { } $b = new B(); $b->instOfParent = new A(); # A is B's parent var_dump($b); $b->instOfParent = new A(); # B is a sub-class of A var_dump($b); $b->instOfParent = new C(); # C is a sub-sub-class of A var_dump($b); $b->instOfParent = new Beta(); # Beta is a sub-class of A (but not of B) var_dump($b);