Programmer's Reference Guide

过滤器链

编写过滤器

Zend_Filter提供了一系列常用的过滤器，但是开发者经常需要为他们特殊的用例编写定制的过滤器。编写定制的过滤器很容易，只要实现Zend_Filter_Interface接口。

Zend_Filter_Interface接口定义了一个方法filter()，可被用户的类实现。使用Zend_Filter::addFilter()方法，可以把一个实现了这个接口的对象添加到过滤器链中。

下面的例子，示范了怎样编写一个定制的过滤器：

class MyFilter implements Zend_Filter_Interface
{
    public function filter($value)
    {
        // perform some transformation upon $value to arrive on $valueFiltered

        return $valueFiltered;
    }
}

添加上述过滤器的实例到过滤器链中：

$filterChain = new Zend_Filter();
$filterChain->addFilter(new MyFilter());

过滤器链

Zend_Filter
Zend Framework手册中文版

Zend_Filter_Input

Comments

Posted by: Dumitru on: 2010-03-23 14:16:30 ⁋

/**
* EmailMaskFilter
* A simple custom filter that will hide a part of the email
* letting user to see only the first letter and the domain
* the rest part uf the email is filled with wildcards
* ex: t***@gmail.com
*/
class EmailMaskFilter implements Zend_Filter_Interface
{
public function filter($value)
{
$mask = str_pad('', strpos($value, '@') - 1, '*');
$valueFiltered = substr_replace($value, $mask, 1, strlen($mask));
return $valueFiltered;
}
}

Posted by: DoubleG on: 2011-05-16 09:00:25 ⁋

Where should I put my filter files to make ZF load them automatically?

Posted by: Elio on: 2011-11-18 10:33:16 ⁋

This documentation is too pour!!!

The question of DoubleG is totally appropriate! How can you think to illustate how to write a custom filter without even tell WHERE to put it???

This is simple crazy.

Posted by: Fran on: 2012-02-07 00:01:27 ⁋

autoloaderNamespaces[]= "CustomLibrary"

then you can call the filter something like
$usernameElement= new Zend_Form_Element_Text('username');
$usernameElement->addFilter(new CustomLibrary_Filter_MyFilter)

Posted by: Fran on: 2012-02-07 00:02:59 ⁋

http://www.zendcasts.com/writing-custom-zend-filters-with-htmlpurifier/2011/06/