<?php abstract class I { public function qwer(); } abstract class A { public function asdf(I $a) { $a->qwer(); } } class C extends I { public function qwer() { echo "yep"; } } class B extends A { public function asdf(C $asdf) { parent::asdf($asdf); } } $par = new C(); (new B())->asdf($par);
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