[PHP] [PHP5] How to knwo object class name in a function called statically ?

[Frédéric Hardy]

Hello -
I have this code :
abstract class foo
{
   private __construct() {}
   public static getInstance()
   {
      static $instance = null;
      if (is_null($instance) == false)
         return $instance;
      else
      {
         $class = __CLASS__;
         return new $class();
      }
   }
}
class extendedFoo extends foo
{
   ...
}
$instance = extendedFoo::getInstance();
echo (get_class($instance));
My problem is that get_class($instance) return "foo" instead of 
"extendedFoo" !!!

How to knwo the calling object type in a function called statically ? 
Reflection ? Other solution ??? Bug ????

I can resolve my probleme with a extendedFoo::getInstance() function, 
and adding a parameter $class to foo::getInstance(), but i don't want 
duplicated code in all foo subclass...

Fred -
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