What is the difference between new self and new static?

self-vs-static.php

<?php
/**
 * What is the difference between new self and new static?
 * self refers to the same class in which the new keyword is actually written.
 * 
 * static, in PHP 5.3's late static bindings, 
 * refers to whatever class in the hierarchy you called the method on.
 * 
 * In the following example, B inherits both methods from A. 
 * The self invocation is bound to A because it's defined in A's implementation 
 * of the first method, whereas static is bound to the called class (also see get_called_class()).
 */

class A {
    public static function get_self() {
        return new self();
    }

    public static function get_static() {
        return new static();
    }
}

class B extends A {}

echo get_class(B::get_self());  // A
echo get_class(B::get_static()); // B
echo get_class(A::get_self()); // A
echo get_class(A::get_static()); // A