Description:
------------
When a static (either public or protected) class member is initialised to a default value in a class declaration and later the value is over-written in the class where it is decalred, inheriting classes cannot access the new member value. In the example class Bar can access the value assigned to Foo's $name member, but Bar cannot access the value assigned to Foo's $age member.

If the $age member is assigned a value inside class Bar (in the constructor for example) then the code works as expected.

Reproduce code:
---------------
<?php
class Foo{
        protected static $name;
        protected static $age = NULL;
        public function __construct($name, $age){
                self::$name = $name;
                self::$age = $age;}
        protected static function getName(){return self::$name;}
        protected static function getAge(){return self::$age;}
}
class Bar extends Foo {
        public function __construct($name, $age){
                parent::__construct($name, $age);}
        public function display(){
                print "name = '" . self::$name . "'\ngetName() = '" . self::getName() . "'\nage = '" . self::$age . "'\ngetAge() = '" . self::getAge() . "'\n";}
}
$b = new Bar('test', 100);
$b->display();
?>

Expected result:
----------------
name = 'test'
getName() = 'test'
age = '100'
getAge() = '100'


Actual result:
--------------
name = 'test'
getName() = 'test'
age = ''
getAge() = '100'