/** * The magic sleep method is called by the PHP runtime environment before an * instance of this class gets serialized. It returns an array with the * names of all those properties that should be cached for this class or * interface instance. * * @return array * @since 0.10.0 */ public function __sleep() { return array_merge(array('constants', 'interfaceReferences', 'parentClassReference'), parent::__sleep()); }