Detailed explanation of usage of Zend Framework action assistant FlashMessenger, zendflashmessenger

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Detailed explanation of usage of Zend Framework action assistant FlashMessenger, zendflashmessenger_PHP tutorial

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Jul 12, 2016 am 08:57 AM

frameworkzend

Detailed explanation of the usage of Zend Framework action assistant FlashMessenger, zendflashmessenger

This article describes the usage of Zend Framework action assistant FlashMessenger with examples. Share it with everyone for your reference, the details are as follows:

FlashMessenger is used to handle Flash Messenger sessions; FlashMessenger is a magical assistant.

There is a scenario where after the user successfully registers, the user's name needs to be displayed on the prompt page. If the request is not passed through get, of course you can also pass it through session

The user name to display. However, the operation of seesion is inevitably complicated. You can use Flash Messenger to quickly realize this requirement.

Flash Messenger Assistant allows you to deliver messages that the user may need to see on their next request.

FlashMessenger also uses Zend_Session_Namespace to store messages for future or next request to read, but it is relatively simple.

Simple usage of Flash Messenger:

Based on the helper_demo1 project

Add /helper_demo1/application/controllers/UserController.php

<&#63;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();
  }
}

Add /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>
<&#63;php
var_dump($this->messages);
&#63;>
</body>
</html>

Visit http://www.localzend.com/helper_demo1/public/user/register
Jump to http://www.localzend.com/helper_demo1/public/user/regtips

FlashMessager implementation source code is as follows

<&#63;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:
 * http://framework.zend.com/license/new-bsd
 * 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. (http://www.zend.com)
 * @license  http://framework.zend.com/license/new-bsd   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. (http://www.zend.com)
 * @license  http://framework.zend.com/license/new-bsd   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);
  }
}

Readers who are interested in more zend-related content can check out the special topics of this site: "Zend FrameWork Framework Introductory Tutorial", "php Excellent Development Framework Summary", "Yii Framework Introduction and Summary of Common Techniques", "ThinkPHP Introductory Tutorial" , "php object-oriented programming introductory tutorial", "php mysql database operation introductory tutorial" and "php common database operation skills summary"

I hope this article will be helpful to everyone in PHP programming.

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