ZendFramework教程之Zend_Controller_Plugin插件用法详解_PHP

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通过Zend_Controller_Plugin可以向前端控制器增加附加的功能。便于w一些特殊功能。以下是Zend_Controller_Plugin的简单介绍。

Zend_Controller_Plugin的基本实现

├── Plugin
│ ├── Abstract.php
│ ├── ActionStack.php
│ ├── Broker.php
│ ├── ErrorHandler.php
│ └── PutHandler.php

Zend_Controller_Plugin_Abstract

abstract class Zend_Controller_Plugin_Abstract
{
 protected $_request;
 protected $_response;
 public function setRequest(Zend_Controller_Request_Abstract $request)
 {
  $this->_request = $request;
  return $this;
 }
 public function getRequest()
 {
  return $this->_request;
 }
 public function setResponse(Zend_Controller_Response_Abstract $response)
 {
  $this->_response = $response;
  return $this;
 }
 public function getResponse()
 {
  return $this->_response;
 }
 /**
  * Called before Zend_Controller_Front begins evaluating the
  * request against its routes.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function routeStartup(Zend_Controller_Request_Abstract $request)
 {}
 /**
  * Called after Zend_Controller_Router exits.
  *
  * Called after Zend_Controller_Front exits from the router.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function routeShutdown(Zend_Controller_Request_Abstract $request)
 {}
 /**
  * Called before Zend_Controller_Front enters its dispatch loop.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function dispatchLoopStartup(Zend_Controller_Request_Abstract $request)
 {}
 /**
  * Called before an action is dispatched by Zend_Controller_Dispatcher.
  *
  * This callback allows for proxy or filter behavior. By altering the
  * request and resetting its dispatched flag (via
  * {@link Zend_Controller_Request_Abstract::setDispatched() setDispatched(false)}),
  * the current action may be skipped.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function preDispatch(Zend_Controller_Request_Abstract $request)
 {}
 /**
  * Called after an action is dispatched by Zend_Controller_Dispatcher.
  *
  * This callback allows for proxy or filter behavior. By altering the
  * request and resetting its dispatched flag (via
  * {@link Zend_Controller_Request_Abstract::setDispatched() setDispatched(false)}),
  * a new action may be specified for dispatching.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function postDispatch(Zend_Controller_Request_Abstract $request)
 {}
 /**
  * Called before Zend_Controller_Front exits its dispatch loop.
  *
  * @return void
  */
 public function dispatchLoopShutdown()
 {}
}

Zend_Controller_Plugin_Abstract声明定义了Zend_Controller运行过程中的几个关键事件位置。用户可以通过指定的方法，对指定位置的请求和相应对象进行相关操作。

Zend_Controller_Plugin_Abstract中方法的描述如下：

routeStartup() 在 Zend_Controller_Front 向注册的 路由器 发送请求前被调用。
routeShutdown()在 路由器 完成请求的路由后被调用。
dispatchLoopStartup() 在 Zend_Controller_Front 进入其分发循环（dispatch loop）前被调用。
preDispatch() 在动作由 分发器 分发前被调用。该回调方法允许代理或者过滤行为。通过修改请求和重设分发标志位（利用 Zend_Controller_Request_Abstract::setDispatched(false) ）当前动作可以跳过或者被替换。
postDispatch() 在动作由 分发器 分发后被调用。该回调方法允许代理或者过滤行为。通过修改请求和重设分发标志位（利用 Zend_Controller_Request_Abstract::setDispatched(false) ）可以指定新动作进行分发。
dispatchLoopShutdown() 在 Zend_Controller_Front 推出其分发循环后调用。

Zend_Controller_Plugin提供的默认插件:

Zend_Controller_Plugin_Broker:插件经纪人，用于注册，管理自定义的Zend_Controller插件。具体用法，可以参考类代码。
Zend_Controller_Plugin_ActionStack:用于管理动作堆栈。具体用法，可以参考类代码。
Zend_Controller_Plugin_ErrorHandler:用来处理抛出的异常。具体用法，可以参考类代码。
Zend_Controller_Plugin_PutHandler:用于处理请求操作 PUT 。具体用法，可以参考类代码。

Zend_Controller_Plugin_Broker

<?php
/** Zend_Controller_Plugin_Abstract */
require_once 'Zend/Controller/Plugin/Abstract.php';
class Zend_Controller_Plugin_Broker extends Zend_Controller_Plugin_Abstract
{
 protected $_plugins = array();
 /**
  * Register a plugin.
  *
  * @param Zend_Controller_Plugin_Abstract $plugin
  * @param int $stackIndex
  * @return Zend_Controller_Plugin_Broker
  */
 public function registerPlugin(Zend_Controller_Plugin_Abstract $plugin, $stackIndex = null)
 {
  if (false !== array_search($plugin, $this->_plugins, true)) {
   require_once 'Zend/Controller/Exception.php';
   throw new Zend_Controller_Exception('Plugin already registered');
  }
  $stackIndex = (int) $stackIndex;
  if ($stackIndex) {
   if (isset($this->_plugins[$stackIndex])) {
    require_once 'Zend/Controller/Exception.php';
    throw new Zend_Controller_Exception('Plugin with stackIndex "' . $stackIndex . '" already registered');
   }
   $this->_plugins[$stackIndex] = $plugin;
  } else {
   $stackIndex = count($this->_plugins);
   while (isset($this->_plugins[$stackIndex])) {
    ++$stackIndex;
   }
   $this->_plugins[$stackIndex] = $plugin;
  }
  $request = $this->getRequest();
  if ($request) {
   $this->_plugins[$stackIndex]->setRequest($request);
  }
  $response = $this->getResponse();
  if ($response) {
   $this->_plugins[$stackIndex]->setResponse($response);
  }
  ksort($this->_plugins);
  return $this;
 }
 /**
  * Unregister a plugin.
  *
  * @param string|Zend_Controller_Plugin_Abstract $plugin Plugin object or class name
  * @return Zend_Controller_Plugin_Broker
  */
 public function unregisterPlugin($plugin)
 {
  if ($plugin instanceof Zend_Controller_Plugin_Abstract) {
   // Given a plugin object, find it in the array
   $key = array_search($plugin, $this->_plugins, true);
   if (false === $key) {
    require_once 'Zend/Controller/Exception.php';
    throw new Zend_Controller_Exception('Plugin never registered.');
   }
   unset($this->_plugins[$key]);
  } elseif (is_string($plugin)) {
   // Given a plugin class, find all plugins of that class and unset them
   foreach ($this->_plugins as $key => $_plugin) {
    $type = get_class($_plugin);
    if ($plugin == $type) {
     unset($this->_plugins[$key]);
    }
   }
  }
  return $this;
 }
 /**
  * Is a plugin of a particular class registered?
  *
  * @param string $class
  * @return bool
  */
 public function hasPlugin($class)
 {
  foreach ($this->_plugins as $plugin) {
   $type = get_class($plugin);
   if ($class == $type) {
    return true;
   }
  }
  return false;
 }
 /**
  * Retrieve a plugin or plugins by class
  *
  * @param string $class Class name of plugin(s) desired
  * @return false|Zend_Controller_Plugin_Abstract|array Returns false if none found, plugin if only one found, and array of plugins if multiple plugins of same class found
  */
 public function getPlugin($class)
 {
  $found = array();
  foreach ($this->_plugins as $plugin) {
   $type = get_class($plugin);
   if ($class == $type) {
    $found[] = $plugin;
   }
  }
  switch (count($found)) {
   case 0:
    return false;
   case 1:
    return $found[0];
   default:
    return $found;
  }
 }
 /**
  * Retrieve all plugins
  *
  * @return array
  */
 public function getPlugins()
 {
  return $this->_plugins;
 }
 /**
  * Set request object, and register with each plugin
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return Zend_Controller_Plugin_Broker
  */
 public function setRequest(Zend_Controller_Request_Abstract $request)
 {
  $this->_request = $request;
  foreach ($this->_plugins as $plugin) {
   $plugin->setRequest($request);
  }
  return $this;
 }
 /**
  * Get request object
  *
  * @return Zend_Controller_Request_Abstract $request
  */
 public function getRequest()
 {
  return $this->_request;
 }
 /**
  * Set response object
  *
  * @param Zend_Controller_Response_Abstract $response
  * @return Zend_Controller_Plugin_Broker
  */
 public function setResponse(Zend_Controller_Response_Abstract $response)
 {
  $this->_response = $response;
  foreach ($this->_plugins as $plugin) {
   $plugin->setResponse($response);
  }
  return $this;
 }
 /**
  * Get response object
  *
  * @return Zend_Controller_Response_Abstract $response
  */
 public function getResponse()
 {
  return $this->_response;
 }
 /**
  * Called before Zend_Controller_Front begins evaluating the
  * request against its routes.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function routeStartup(Zend_Controller_Request_Abstract $request)
 {
  foreach ($this->_plugins as $plugin) {
   try {
    $plugin->routeStartup($request);
   } catch (Exception $e) {
    if (Zend_Controller_Front::getInstance()->throwExceptions()) {
     throw new Zend_Controller_Exception($e->getMessage() . $e->getTraceAsString(), $e->getCode(), $e);
    } else {
     $this->getResponse()->setException($e);
    }
   }
  }
 }
 /**
  * Called before Zend_Controller_Front exits its iterations over
  * the route set.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function routeShutdown(Zend_Controller_Request_Abstract $request)
 {
  foreach ($this->_plugins as $plugin) {
   try {
    $plugin->routeShutdown($request);
   } catch (Exception $e) {
    if (Zend_Controller_Front::getInstance()->throwExceptions()) {
     throw new Zend_Controller_Exception($e->getMessage() . $e->getTraceAsString(), $e->getCode(), $e);
    } else {
     $this->getResponse()->setException($e);
    }
   }
  }
 }
 /**
  * Called before Zend_Controller_Front enters its dispatch loop.
  *
  * During the dispatch loop, Zend_Controller_Front keeps a
  * Zend_Controller_Request_Abstract object, and uses
  * Zend_Controller_Dispatcher to dispatch the
  * Zend_Controller_Request_Abstract object to controllers/actions.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function dispatchLoopStartup(Zend_Controller_Request_Abstract $request)
 {
  foreach ($this->_plugins as $plugin) {
   try {
    $plugin->dispatchLoopStartup($request);
   } catch (Exception $e) {
    if (Zend_Controller_Front::getInstance()->throwExceptions()) {
     throw new Zend_Controller_Exception($e->getMessage() . $e->getTraceAsString(), $e->getCode(), $e);
    } else {
     $this->getResponse()->setException($e);
    }
   }
  }
 }
 /**
  * Called before an action is dispatched by Zend_Controller_Dispatcher.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function preDispatch(Zend_Controller_Request_Abstract $request)
 {
  foreach ($this->_plugins as $plugin) {
   try {
    $plugin->preDispatch($request);
   } catch (Exception $e) {
    if (Zend_Controller_Front::getInstance()->throwExceptions()) {
     throw new Zend_Controller_Exception($e->getMessage() . $e->getTraceAsString(), $e->getCode(), $e);
    } else {
     $this->getResponse()->setException($e);
     // skip rendering of normal dispatch give the error handler a try
     $this->getRequest()->setDispatched(false);
    }
   }
  }
 }
 /**
  * Called after an action is dispatched by Zend_Controller_Dispatcher.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function postDispatch(Zend_Controller_Request_Abstract $request)
 {
  foreach ($this->_plugins as $plugin) {
   try {
    $plugin->postDispatch($request);
   } catch (Exception $e) {
    if (Zend_Controller_Front::getInstance()->throwExceptions()) {
     throw new Zend_Controller_Exception($e->getMessage() . $e->getTraceAsString(), $e->getCode(), $e);
    } else {
     $this->getResponse()->setException($e);
    }
   }
  }
 }
 /**
  * Called before Zend_Controller_Front exits its dispatch loop.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function dispatchLoopShutdown()
 {
  foreach ($this->_plugins as $plugin) {
   try {
    $plugin->dispatchLoopShutdown();
   } catch (Exception $e) {
    if (Zend_Controller_Front::getInstance()->throwExceptions()) {
     throw new Zend_Controller_Exception($e->getMessage() . $e->getTraceAsString(), $e->getCode(), $e);
    } else {
     $this->getResponse()->setException($e);
    }
   }
  }
 }
}

Zend_Controller_Plugin_ActionStack

<?php
/** Zend_Controller_Plugin_Abstract */
require_once 'Zend/Controller/Plugin/Abstract.php';
/** Zend_Registry */
require_once 'Zend/Registry.php';
class Zend_Controller_Plugin_ActionStack extends Zend_Controller_Plugin_Abstract
{
 /** @var Zend_Registry */
 protected $_registry;
 /**
  * Registry key under which actions are stored
  * @var string
  */
 protected $_registryKey = 'Zend_Controller_Plugin_ActionStack';
 /**
  * Valid keys for stack items
  * @var array
  */
 protected $_validKeys = array(
  'module',
  'controller',
  'action',
  'params'
 );
 /**
  * Flag to determine whether request parameters are cleared between actions, or whether new parameters
  * are added to existing request parameters.
  *
  * @var Bool
  */
 protected $_clearRequestParams = false;
 /**
  * Constructor
  *
  * @param Zend_Registry $registry
  * @param string $key
  * @return void
  */
 public function __construct(Zend_Registry $registry = null, $key = null)
 {
  if (null === $registry) {
   $registry = Zend_Registry::getInstance();
  }
  $this->setRegistry($registry);
  if (null !== $key) {
   $this->setRegistryKey($key);
  } else {
   $key = $this->getRegistryKey();
  }
  $registry[$key] = array();
 }
 /**
  * Set registry object
  *
  * @param Zend_Registry $registry
  * @return Zend_Controller_Plugin_ActionStack
  */
 public function setRegistry(Zend_Registry $registry)
 {
  $this->_registry = $registry;
  return $this;
 }
 /**
  * Retrieve registry object
  *
  * @return Zend_Registry
  */
 public function getRegistry()
 {
  return $this->_registry;
 }
 /**
  * Retrieve registry key
  *
  * @return string
  */
 public function getRegistryKey()
 {
  return $this->_registryKey;
 }
 /**
  * Set registry key
  *
  * @param string $key
  * @return Zend_Controller_Plugin_ActionStack
  */
 public function setRegistryKey($key)
 {
  $this->_registryKey = (string) $key;
  return $this;
 }
 /**
  * Set clearRequestParams flag
  *
  * @param bool $clearRequestParams
  * @return Zend_Controller_Plugin_ActionStack
  */
 public function setClearRequestParams($clearRequestParams)
 {
  $this->_clearRequestParams = (bool) $clearRequestParams;
  return $this;
 }
 /**
  * Retrieve clearRequestParams flag
  *
  * @return bool
  */
 public function getClearRequestParams()
 {
  return $this->_clearRequestParams;
 }
 /**
  * Retrieve action stack
  *
  * @return array
  */
 public function getStack()
 {
  $registry = $this->getRegistry();
  $stack = $registry[$this->getRegistryKey()];
  return $stack;
 }
 /**
  * Save stack to registry
  *
  * @param array $stack
  * @return Zend_Controller_Plugin_ActionStack
  */
 protected function _saveStack(array $stack)
 {
  $registry = $this->getRegistry();
  $registry[$this->getRegistryKey()] = $stack;
  return $this;
 }
 /**
  * Push an item onto the stack
  *
  * @param Zend_Controller_Request_Abstract $next
  * @return Zend_Controller_Plugin_ActionStack
  */
 public function pushStack(Zend_Controller_Request_Abstract $next)
 {
  $stack = $this->getStack();
  array_push($stack, $next);
  return $this->_saveStack($stack);
 }
 /**
  * Pop an item off the action stack
  *
  * @return false|Zend_Controller_Request_Abstract
  */
 public function popStack()
 {
  $stack = $this->getStack();
  if (0 == count($stack)) {
   return false;
  }
  $next = array_pop($stack);
  $this->_saveStack($stack);
  if (!$next instanceof Zend_Controller_Request_Abstract) {
   require_once 'Zend/Controller/Exception.php';
   throw new Zend_Controller_Exception('ArrayStack should only contain request objects');
  }
  $action = $next->getActionName();
  if (empty($action)) {
   return $this->popStack($stack);
  }
  $request = $this->getRequest();
  $controller = $next->getControllerName();
  if (empty($controller)) {
   $next->setControllerName($request->getControllerName());
  }
  $module = $next->getModuleName();
  if (empty($module)) {
   $next->setModuleName($request->getModuleName());
  }
  return $next;
 }
 /**
  * postDispatch() plugin hook -- check for actions in stack, and dispatch if any found
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 public function postDispatch(Zend_Controller_Request_Abstract $request)
 {
  // Don't move on to next request if this is already an attempt to
  // forward
  if (!$request->isDispatched()) {
   return;
  }
  $this->setRequest($request);
  $stack = $this->getStack();
  if (empty($stack)) {
   return;
  }
  $next = $this->popStack();
  if (!$next) {
   return;
  }
  $this->forward($next);
 }
 /**
  * Forward request with next action
  *
  * @param array $next
  * @return void
  */
 public function forward(Zend_Controller_Request_Abstract $next)
 {
  $request = $this->getRequest();
  if ($this->getClearRequestParams()) {
   $request->clearParams();
  }
  $request->setModuleName($next->getModuleName())
    ->setControllerName($next->getControllerName())
    ->setActionName($next->getActionName())
    ->setParams($next->getParams())
    ->setDispatched(false);
 }
}

Zend_Controller_Plugin_ErrorHandler

<?php
/** Zend_Controller_Plugin_Abstract */
require_once 'Zend/Controller/Plugin/Abstract.php';
class Zend_Controller_Plugin_ErrorHandler extends Zend_Controller_Plugin_Abstract
{
 /**
  * Const - No controller exception; controller does not exist
  */
 const EXCEPTION_NO_CONTROLLER = 'EXCEPTION_NO_CONTROLLER';
 /**
  * Const - No action exception; controller exists, but action does not
  */
 const EXCEPTION_NO_ACTION = 'EXCEPTION_NO_ACTION';
 /**
  * Const - No route exception; no routing was possible
  */
 const EXCEPTION_NO_ROUTE = 'EXCEPTION_NO_ROUTE';
 /**
  * Const - Other Exception; exceptions thrown by application controllers
  */
 const EXCEPTION_OTHER = 'EXCEPTION_OTHER';
 /**
  * Module to use for errors; defaults to default module in dispatcher
  * @var string
  */
 protected $_errorModule;
 /**
  * Controller to use for errors; defaults to 'error'
  * @var string
  */
 protected $_errorController = 'error';
 /**
  * Action to use for errors; defaults to 'error'
  * @var string
  */
 protected $_errorAction = 'error';
 /**
  * Flag; are we already inside the error handler loop?
  * @var bool
  */
 protected $_isInsideErrorHandlerLoop = false;
 /**
  * Exception count logged at first invocation of plugin
  * @var int
  */
 protected $_exceptionCountAtFirstEncounter = 0;
 /**
  * Constructor
  *
  * Options may include:
  * - module
  * - controller
  * - action
  *
  * @param Array $options
  * @return void
  */
 public function __construct(Array $options = array())
 {
  $this->setErrorHandler($options);
 }
 /**
  * setErrorHandler() - setup the error handling options
  *
  * @param array $options
  * @return Zend_Controller_Plugin_ErrorHandler
  */
 public function setErrorHandler(Array $options = array())
 {
  if (isset($options['module'])) {
   $this->setErrorHandlerModule($options['module']);
  }
  if (isset($options['controller'])) {
   $this->setErrorHandlerController($options['controller']);
  }
  if (isset($options['action'])) {
   $this->setErrorHandlerAction($options['action']);
  }
  return $this;
 }
 /**
  * Set the module name for the error handler
  *
  * @param string $module
  * @return Zend_Controller_Plugin_ErrorHandler
  */
 public function setErrorHandlerModule($module)
 {
  $this->_errorModule = (string) $module;
  return $this;
 }
 /**
  * Retrieve the current error handler module
  *
  * @return string
  */
 public function getErrorHandlerModule()
 {
  if (null === $this->_errorModule) {
   $this->_errorModule = Zend_Controller_Front::getInstance()->getDispatcher()->getDefaultModule();
  }
  return $this->_errorModule;
 }
 /**
  * Set the controller name for the error handler
  *
  * @param string $controller
  * @return Zend_Controller_Plugin_ErrorHandler
  */
 public function setErrorHandlerController($controller)
 {
  $this->_errorController = (string) $controller;
  return $this;
 }
 /**
  * Retrieve the current error handler controller
  *
  * @return string
  */
 public function getErrorHandlerController()
 {
  return $this->_errorController;
 }
 /**
  * Set the action name for the error handler
  *
  * @param string $action
  * @return Zend_Controller_Plugin_ErrorHandler
  */
 public function setErrorHandlerAction($action)
 {
  $this->_errorAction = (string) $action;
  return $this;
 }
 /**
  * Retrieve the current error handler action
  *
  * @return string
  */
 public function getErrorHandlerAction()
 {
  return $this->_errorAction;
 }
 /**
  * Route shutdown hook -- Ccheck for router exceptions
  *
  * @param Zend_Controller_Request_Abstract $request
  */
 public function routeShutdown(Zend_Controller_Request_Abstract $request)
 {
  $this->_handleError($request);
 }
 /**
  * Pre dispatch hook -- check for exceptions and dispatch error handler if
  * necessary
  *
  * @param Zend_Controller_Request_Abstract $request
  */
 public function preDispatch(Zend_Controller_Request_Abstract $request)
 {
  $this->_handleError($request);
 }
 /**
  * Post dispatch hook -- check for exceptions and dispatch error handler if
  * necessary
  *
  * @param Zend_Controller_Request_Abstract $request
  */
 public function postDispatch(Zend_Controller_Request_Abstract $request)
 {
  $this->_handleError($request);
 }
 /**
  * Handle errors and exceptions
  *
  * If the 'noErrorHandler' front controller flag has been set,
  * returns early.
  *
  * @param Zend_Controller_Request_Abstract $request
  * @return void
  */
 protected function _handleError(Zend_Controller_Request_Abstract $request)
 {
  $frontController = Zend_Controller_Front::getInstance();
  if ($frontController->getParam('noErrorHandler')) {
   return;
  }
  $response = $this->getResponse();
  if ($this->_isInsideErrorHandlerLoop) {
   $exceptions = $response->getException();
   if (count($exceptions) > $this->_exceptionCountAtFirstEncounter) {
    // Exception thrown by error handler; tell the front controller to throw it
    $frontController->throwExceptions(true);
    throw array_pop($exceptions);
   }
  }
  // check for an exception AND allow the error handler controller the option to forward
  if (($response->isException()) && (!$this->_isInsideErrorHandlerLoop)) {
   $this->_isInsideErrorHandlerLoop = true;
   // Get exception information
   $error   = new ArrayObject(array(), ArrayObject::ARRAY_AS_PROPS);
   $exceptions  = $response->getException();
   $exception  = $exceptions[0];
   $exceptionType = get_class($exception);
   $error->exception = $exception;
   switch ($exceptionType) {
    case 'Zend_Controller_Router_Exception':
     if (404 == $exception->getCode()) {
      $error->type = self::EXCEPTION_NO_ROUTE;
     } else {
      $error->type = self::EXCEPTION_OTHER;
     }
     break;
    case 'Zend_Controller_Dispatcher_Exception':
     $error->type = self::EXCEPTION_NO_CONTROLLER;
     break;
    case 'Zend_Controller_Action_Exception':
     if (404 == $exception->getCode()) {
      $error->type = self::EXCEPTION_NO_ACTION;
     } else {
      $error->type = self::EXCEPTION_OTHER;
     }
     break;
    default:
     $error->type = self::EXCEPTION_OTHER;
     break;
   }
   // Keep a copy of the original request
   $error->request = clone $request;
   // get a count of the number of exceptions encountered
   $this->_exceptionCountAtFirstEncounter = count($exceptions);
   // Forward to the error handler
   $request->setParam('error_handler', $error)
     ->setModuleName($this->getErrorHandlerModule())
     ->setControllerName($this->getErrorHandlerController())
     ->setActionName($this->getErrorHandlerAction())
     ->setDispatched(false);
  }
 }
}

Zend_Controller_Plugin_PutHandler

<?php
require_once 'Zend/Controller/Plugin/Abstract.php';
require_once 'Zend/Controller/Request/Http.php';
class Zend_Controller_Plugin_PutHandler extends Zend_Controller_Plugin_Abstract
{
 /**
  * Before dispatching, digest PUT request body and set params
  *
  * @param Zend_Controller_Request_Abstract $request
  */
 public function preDispatch(Zend_Controller_Request_Abstract $request)
 {
  if (!$request instanceof Zend_Controller_Request_Http) {
   return;
  }
  if ($this->_request->isPut()) {
   $putParams = array();
   parse_str($this->_request->getRawBody(), $putParams);
   $request->setParams($putParams);
  }
 }
}

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