The __clone Wars

(Sorry for the subject, I couldn't resist). It seems that the parent class's variables are not being copied per bit by the default implementation, so how should a superclasses __clone() method be dealt with? In other words, should it be like this: public function __clone() { $this = parent::__clone(); $this->... = $that->... } P.S. Perhaps the $this object should already be set using the default implementation, and then the user could override certain properties if he so wishes; I believe the preliminary documentation says that this is the case, but it doesn't work like this.