<?php // Invalid example class Animal { public function eat(){} } class Cat extends Animal { public function meow(){ echo "meow"; } } class A { function foo(): Animal { return new Animal(); } } class B extends A { function foo(): Cat { return new Cat(); } } if (rand(0, 1)) { $object = new A; } else { $object = new B; } $animal = $object->foo(); $animal->meow(); // This code fails %50 of the time as not all animals can meow.
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