Zend Framework实现自定义过滤器的方法

<?phprequire_once 'Zend/Filter/Interface.php';class MyFilter implements Zend_Filter_Interface{ public function filter($value){  $badlist = array("梨","草莓","苹果");  for($i = 0;$i<count($badlist);$i++){   $value = str_replace($badlist[$i], "*", $value);  }  return $value; }}$filter = new MyFilter();$temp1 = "桔子真好吃";$temp2 = "我喜欢吃苹果";$temp3 = "梨也不错，但我最喜欢吃的是草莓！";echo "内容：".$temp1."<p>经过过滤后为：";echo $filter->filter($temp1);echo "<p>";echo "内容：".$temp2."<p>经过过滤后为：";echo $filter->filter($temp2);echo "<p>";echo "内容：".$temp3."<p>经过过滤后为：";echo $filter->filter($temp3);echo "<p>";