FlashMessenger 用来处理Flash Messenger会话；FlashMessenger是一个神奇的助手。
有这么一种场景，在用户注册成功后，需要在提示页面上显示用户的名称，如果不通过get传递请求，当然你也可以通过session传递
要显示的用户名称。但是seesion的操作难免复杂，可以使用Flash Messenger快速的实现这个需求。
FlashMessenger助手允许你传递用户可能需要在下个请求看到的消息。
FlashMessenger也是使用Zend_Session_Namespace来存储消息以备将来或下个请求来读取，但是相对简单一些。
FlashMessenger简单用法：
在helper_demo1项目的基础上
新增/helper_demo1/application/controllers/UserController.php
<?php class UserController extends Zend_Controller_Action { protected $_flashMessenger = null; public function init() { $this->_flashMessenger = $this->_helper->getHelper('FlashMessenger'); $this->initView(); } public function registerAction() { $this->_flashMessenger->addMessage('xxxxx,Welcome!'); $this->_helper->redirector('regtips'); } public function regtipsAction() { $this->view->messages = $this->_flashMessenger->getMessages(); } }
新增/helper_demo1/application/views/scripts/user/regtips.phtml
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>test</title> </head> <body> <?php var_dump($this->messages); ?> </body> </html>
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FlashMessager实现源码如下
<?php /** * Zend Framework * * LICENSE * * This source file is subject to the new BSD license that is bundled * with this package in the file LICENSE.txt. * It is also available through the world-wide-web at this URL: * * If you did not receive a copy of the license and are unable to * obtain it through the world-wide-web, please send an email * to license@zend.com so we can send you a copy immediately. * * @category Zend * @package Zend_Controller * @subpackage Zend_Controller_Action_Helper * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. () * @license New BSD License */ /** * @see Zend_Session */ require_once 'Zend/Session.php'; /** * @see Zend_Controller_Action_Helper_Abstract */ require_once 'Zend/Controller/Action/Helper/Abstract.php'; /** * Flash Messenger - implement session-based messages * * @uses Zend_Controller_Action_Helper_Abstract * @category Zend * @package Zend_Controller * @subpackage Zend_Controller_Action_Helper * @copyright Copyright (c) 2005-2011 Zend Technologies USA Inc. () * @license New BSD License * @version $Id: FlashMessenger.php 23775 2011-03-01 17:25:24Z ralph $ */ class Zend_Controller_Action_Helper_FlashMessenger extends Zend_Controller_Action_Helper_Abstract implements IteratorAggregate, Countable { /** * $_messages - Messages from previous request * * @var array */ static protected $_messages = array(); /** * $_session - Zend_Session storage object * * @var Zend_Session */ static protected $_session = null; /** * $_messageAdded - Wether a message has been previously added * * @var boolean */ static protected $_messageAdded = false; /** * $_namespace - Instance namespace, default is 'default' * * @var string */ protected $_namespace = 'default'; /** * __construct() - Instance constructor, needed to get iterators, etc * * @param string $namespace * @return void */ public function __construct() { if (!self::$_session instanceof Zend_Session_Namespace) { self::$_session = new Zend_Session_Namespace($this->getName()); foreach (self::$_session as $namespace => $messages) { self::$_messages[$namespace] = $messages; unset(self::$_session->{$namespace}); } } } /** * postDispatch() - runs after action is dispatched, in this * case, it is resetting the namespace in case we have forwarded to a different * action, Flashmessage will be 'clean' (default namespace) * * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface */ public function postDispatch() { $this->resetNamespace(); return $this; } /** * setNamespace() - change the namespace messages are added to, useful for * per action controller messaging between requests * * @param string $namespace * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface */ public function setNamespace($namespace = 'default') { $this->_namespace = $namespace; return $this; } /** * resetNamespace() - reset the namespace to the default * * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface */ public function resetNamespace() { $this->setNamespace(); return $this; } /** * addMessage() - Add a message to flash message * * @param string $message * @return Zend_Controller_Action_Helper_FlashMessenger Provides a fluent interface */ public function addMessage($message) { if (self::$_messageAdded === false) { self::$_session->setExpirationHops(1, null, true); } if (!is_array(self::$_session->{$this->_namespace})) { self::$_session->{$this->_namespace} = array(); } self::$_session->{$this->_namespace}[] = $message; return $this; } /** * hasMessages() - Wether a specific namespace has messages * * @return boolean */ public function hasMessages() { return isset(self::$_messages[$this->_namespace]); } /** * getMessages() - Get messages from a specific namespace * * @return array */ public function getMessages() { if ($this->hasMessages()) { return self::$_messages[$this->_namespace]; } return array(); } /** * Clear all messages from the previous request & current namespace * * @return boolean True if messages were cleared, false if none existed */ public function clearMessages() { if ($this->hasMessages()) { unset(self::$_messages[$this->_namespace]); return true; } return false; } /** * hasCurrentMessages() - check to see if messages have been added to current * namespace within this request * * @return boolean */ public function hasCurrentMessages() { return isset(self::$_session->{$this->_namespace}); } /** * getCurrentMessages() - get messages that have been added to the current * namespace within this request * * @return array */ public function getCurrentMessages() { if ($this->hasCurrentMessages()) { return self::$_session->{$this->_namespace}; } return array(); } /** * clear messages from the current request & current namespace * * @return boolean */ public function clearCurrentMessages() { if ($this->hasCurrentMessages()) { unset(self::$_session->{$this->_namespace}); return true; } return false; } /** * getIterator() - complete the IteratorAggregate interface, for iterating * * @return ArrayObject */ public function getIterator() { if ($this->hasMessages()) { return new ArrayObject($this->getMessages()); } return new ArrayObject(); } /** * count() - Complete the countable interface * * @return int */ public function count() { if ($this->hasMessages()) { return count($this->getMessages()); } return 0; } /** * Strategy pattern: proxy to addMessage() * * @param string $message * @return void */ public function direct($message) { return $this->addMessage($message); } }