static.php

<?php
    class A {
        public function __construct() {
            echo "I am an A\n";
        }
        public static function bar() {
            new static();
        }
    }

    class B extends A {
        public function __construct() {
            echo "I am a B\n";
        }
        public static function foo() {
            parent::bar();
        }
    }

    B::foo();
?>