Zend_Captcha を使用して検証コードを生成する方法

class TestController extends Lyw0301_Controller_Action {
 public function init() {
parent::init();
 $this->view->title = '测试' ;
 $this->view->baseUrl = $this->getFrontController()->getBaseUrl();
 // $this->_helper->viewRenderer->setNoRender();
 / /Zend_Layout::getMvcInstance()->disableLayout();
 }
 functiongenerateCaptcha() {
 $captcha = new Zend_Captcha_Image();
 $captcha->setTimeout('300')
 ->setWordLen(' 6')
 ->setHeight('80')
 ->setFont('./images/font/micross.ttf')
 ->setImgDir('./images/code');

 $captcha ->生成();
 return $captcha->getId();
 }
 //キャプチャ応答を検証します
 function validateCaptcha($captcha) {
 $captchaId = $captcha['id'];
 $captchaInput = $captcha['input'];
 $captchaSession = new Zend_Session_Namespace('Zend_Form_Captcha_' . $captchaId );
 $captchaIterator = $captchaSession->getIterator();
 Zend_Debug::dump($captchaIterator);exit;
 $captchaWord = $captchaIterator['word'];
 if($captchaWord) {
 if( $ captchaInput != $captchaWord ){
 return false;
 } else {
 return true;
 }
 } else {
 return false;
 }
 }
 public functionindexAction() {
 $captchaId = $this->generateCaptcha ();
 $this->view->captchaId = $captchaId;
 if(isset($_POST['captcha'])) {
 $captcha = $_POST['captcha'];
 if( $this->validateCaptcha($captcha) ) {
 $this->view->message = 'yes';
 } else {
 $this->view->message = 'no' ;
 }
 }
 }
}
?>