IN_UNSET          910 Zend/zend_object_handlers.c 		if (!((*guard) & IN_UNSET)) {
IN_UNSET          915 Zend/zend_object_handlers.c 			(*guard) |= IN_UNSET; /* prevent circular unsetting */
IN_UNSET          917 Zend/zend_object_handlers.c 			(*guard) &= ~IN_UNSET;