function update(SplSubject $c, $r = null) {
if ($c->getProgressInfo($r)) $c->pi .= "-";
}
}
class ProgressObserver2 implements SplObserver {
function update(SplSubject $c, $r = null) {
if ($c->getProgressInfo($r)) $c->pi .= "-";
}
}
class ProgressObserver2 implements SplObserver {