require_once 'Zend/Loader/Autoloader.php'    //载入自动加载类
$loader = Zend_Loader_Autoloader::getInstance();//自动实例化
$loader->registerNamespace('Application_');//注册命名空间（只有系统默认的，和注册的才可以被自动载入）
$loader->registerNamespace(array('Foo_', 'Bar_')); //多个命名空间的注册方法
$loader->setFallbackAutoloader(true);  //一个增加消耗的方法，不需要命名空间，直接载入所有类(不被推荐使用)

set_include_path(implode(PATH_SEPARATOR, array(
    realpath(APPLICATION_PATH . '/../library'),
    realpath(APPLICATION_PATH . '/forms/'),
    get_include_path(),
)));
//这里我们包含了我们的forms目录，方便程序的被载入

<?php
 class Application_Form_Guestbook extends Zend_Form
{
    public function init()
    {
        // Set the method for the display form to POST
        $this->setMethod('post');//设置提交方式

        // Add an email element
        $this->addElement('text', 'email', array(//原件的类型，名词，和一些其他信息的定义
            'label'      => 'Your email address:',
            'required'   => true,
            'filters'    => array('StringTrim'),
            'validators' => array(
                'EmailAddress',
            )
        ));

        // Add the comment element
        $this->addElement('textarea', 'comment', array(
            'label'      => 'Please Comment:',
            'required'   => true,
            'validators' => array(
                array('validator' => 'StringLength', 'options' => array(0, 20))
                )
        ));

        // Add a captcha
        $this->addElement('captcha', 'captcha', array(
            'label'      => 'Please enter the 5 letters displayed below:',
            'required'   => true,
            'captcha'    => array(
                'captcha' => 'Figlet',
                'wordLen' => 5,
                'timeout' => 300
            )
        ));

        // Add the submit button
        $this->addElement('submit', 'submit', array(
            'ignore'   => true,
            'label'    => 'Sign Guestbook',
        ));

        // And finally add some CSRF protection
        $this->addElement('hash', 'csrf', array(
            'ignore' => true,
        ));
    }
}

<?php
class GuestbookController extends Zend_Controller_Action
{
    // snipping indexAction()...
    public function signAction()
    {
        $request = $this->getRequest();//获取接受到得信息
       // include_once("../application/forms/Guestbook.php");  手动加载类，只有不能自动载入时，才需要
        $form    = new Application_Form_Guestbook;//实例化这个方法

        if ($this->getRequest()->isPost()) {//如果是POST传递的结果
            if ($form->isValid($request->getPost())) {//判断传递是否有效
                $comment = new Application_Model_Guestbook($form->getValues());
                $mapper  = new Application_Model_GuestbookMapper();
                $mapper->save($comment);
                return $this->_helper->redirector('index');
            }
        }

        $this->view->form = $form;//将表单赋值给试图
    }
}

Please use the form below to sign our guestbook!
<?php
$this->form->setAction($this->url());
echo $this->form;