Zend_View自带了几个helper类，都是用来生成组件的。每个都有自动过滤变量的功能。

Using these in your view scripts is very easy, here is an example. Note that you all you need to do is call them; they will load and instantiate themselves as they are needed. 使用非常简单，下面是个例子。注意你只需要调用即可，它们会自己加载并实例化。

<?php
// inside your view script, $this refers to the Zend_View instance.
// 
// say that you have already assigned a series of select options under
// the name $countries as array('us' => 'United States', 'il' =>
// 'Israel', 'de' => 'Germany').
?>
<form action="action.php" method="post">
    <p><label>Your Email:
        <?php echo $this->formText('email', 'you@example.com', array('size' => 32)) ?>
    </label></p>
    <p><label>Your Country:
        <?php echo $this->formSelect('country', 'us', null, $this->countries) ?>
    </label></p>
    <p><label>Would you like to opt in?
        <?php echo $this->formCheckbox('opt_in', 'yes', null, array('yes', 'no')) ?>
    </label></p>
</form>
        

以上视图脚本会输出这样的结果：

<form action="action.php" method="post">
    <p><label>Your Email:
        <input type="text" name="email" value="you@example.com" size="32" />
    </label></p>
    <p><label>Your Country:
        <select name="country">
            <option value="us" selected="selected">United States</option>
            <option value="il">Israel</option>
            <option value="de">Germany</option>
        </select>
    </label></p>
    <p><label>Would you like to opt in?
        <input type="hidden" name="opt_in" value="no" />
        <input type="checkbox" name="opt_in" value="yes" checked="checked" />
    </label></p>
</form>
        

就像视图脚本那样，你的控制器也可以设定helper的路径给Zend_View。默认地，Zend_View会到 “Zend/View/Helper/”下查找helper类。你可以用setHelperPath() 和 addHelperPath()来定义自己的路径。另外，你可以指定类名的前缀，用于指定助手类所在的路径。默认情况下，如果没有给出前缀，会假设使用“Zend_View_Helper_”。

<?php
$view = new Zend_View();

// Set path to /path/to/more/helpers, with previs 'My_View_Helper'
$view->setHelperPath('/path/to/more/helpers', 'My_View_Helper');
?>
        

你可以用addHelperPath()来增加helper的路径， Zend_View将使用最近增加的路径。这样你可以使用自己的helper。

<?php
$view = new Zend_View();
// Add /path/to/some/helpers with class prefix 'My_View_Helper'
$view->addHelperPath('/path/to/some/helpers', 'My_View_Helper);
// Add /other/path/to/helpers with class prefix 'Your_View_Helper'
$view->addHelperPath('/other/path/to/helpers', 'Your_View_Helper');

// now when you call $this->helperName(), Zend_View will look first for
// "/other/path/to/helpers/HelperName.php" using class name "My_View_Helper_HelperName", 
// then for "/path/to/some/helpers/HelperName" using class name "Your_View_Helper_HelperName", 
// and finally for "Zend/View/Helper/HelperName.php" using class name "Zend_View_Helper_HelperName".
?>
        

编写自定义的Helper类很容易，只要遵循以下几个原则即可：

把helper类的文件放在你的helper路径下， Zend_View就会自动加载，实例化，持久化，并执行。

下面是一个例子：

<?php
class My_View_Helper_SpecialPurpose {
    protected $_count = 0;
    public function specialPurpose()
    {
        $this->_count++;
        $output = "I have seen 'The Jerk' {$this->_count} time(s).";
        return htmlspecialchars($output);
    }
}
?>
        

Then in a view script, you can call the SpecialPurpose helper as many times as you like; it will be instantiated once, and then it persists for the life of that Zend_View instance. 在视图代码中，你可以调用SpecialPurpose助手任意次。它将被实例化一次，并且会在Zend_View实例的生命周期内持久存在。

<?php
// remember, in a view script, $this refers to the Zend_View instance.
echo $this->specialPurpose();
echo $this->specialPurpose();
echo $this->specialPurpose();
?>
        

输出结果如下所示：

I have seen 'The Jerk' 1 time(s).
I have seen 'The Jerk' 2 time(s).
I have seen 'The Jerk' 3 time(s).