Description:
------------
The code below has worked fine in all php 5 releases (that I've used for the past year and a half anyway).  It now dies with 5.2.6.

Reproduce code:
---------------
class BaseLoginDA
{
    protected $dbg;
    private static $instance;
    private function __construct(){
        echo __METHOD__;
    }
}
class LoginDA extends BaseLoginDA {
    private static $instance;
    //implementing the singleton pattern
    static function getInstance(){
        if (self::$instance){
            return self::$instance;
        }
        else {
            self::$instance = new LoginDA();
            return self::$instance;
        }
    }
}
$loginDA=LoginDA::getInstance();

Expected result:
----------------
an instantiated LoginDA object

Actual result:
--------------
Fatal error: Call to private BaseLoginDA::__construct() from context 'LoginDA'