Description:
------------
__CLASS__ does not contain the correct class name in a generic class if method is called from a derived class.

Reproduce code:
---------------
<?php

class Generic
{
    public static function i_am()
    {
        print __CLASS__ . "\n";
    }
}

class Derived extends Generic
{
}

Generic::i_am();   // correct, print "Generic"
Derived::i_am();   // wrong, should print "Derived"

?>

Expected result:
----------------
If I call a method which was implemented in a parent class I need in any way access to the name of the class which actually was asked to execute the method...


Actual result:
--------------
Always the name of the class that actualy implements the method.