Description:
------------
self:: doesn't care for inheritance in instantiated classes.

self:: doesn't care for private.

private & static keywords don't work together.

redeclaration of static variables doesn't work even for private static.

Reproduce code:
---------------
<?php
class A {
  static $a = 1;

  function show() {
    echo self::$a;
  }
}

class B extends A {
  static $a = 2;
}


B::show(); // writes "1" not "2"

$b = new B();
$b->show(); // writes "1" not "2"


print '<hr />';

class C {
  private static $a = 1;

  function show() {
    echo self::$a;
  }
}

class D extends C {
  private static $a = 2;
}


D::show(); // writes "1" not "2"

$d = new D();
$d->show(); // writes "1" not "2"

?>

Expected result:
----------------
22<hr />22

Actual result:
--------------
11<hr />11