What's the equivalent of virtual functions of c++ in PHP?

Question

Is it abstract function xxx?

I just made a test which seems to indicate a private method to be virtual too?

class a {
 private function test         


        

Answer 1

The example did not show a typical specialization pattern where b does not need to know implementation details of call() but can specify how test() is to be done. And it does return 1 unfortunately. However by declaring the function protected instead of private, it will work as expected.

class a {
    protected function test()
    {
        echo 1;
    }
    public function call() {
        $this->test();
    }
}

class b extends a {
    protected function test()
    {
      echo 2;
    }
}

$instance = new b();
$instance->call();