<?php require_once 'HTML/Progress/monitor.php'; $bar = new HTML_Progress(); $mon = new HTML_Progress_Monitor(); $bar->addListener($mon); $li = $bar->getListeners(); printf("try 1: %d listener(s) <br/>", count($li)); $bar->removeListener($mon); $li = $bar->getListeners(); printf("try 2: %d listener(s) <br/>", count($li));