PHP witch craft at its best?

protected-function-class.php

<?php

class A {
    public function callProtectedFunctionOfInstanceOfClassDescendant()
    {
        echo (new B)->protectedFunction();
    }
}

class B extends A {
    protected function protectedFunction()
    {
        return '1';
    }
}

(new A)->callProtectedFunctionOfInstanceOfClassDescendant();