Zend Framework教程之分发器Zend_Controller_Dispatcher用法详解

本文实例讲述了Zend Framework教程之分发器Zend_Controller_Dispatcher用法。分享给大家供大家参考，具体如下：

分发器的具体实现

Zend Framework的分发器Zend_Controller_Dispatcher设计主要有，如下类和接口组成：

├── Dispatcher
│   ├── Abstract.php
│   ├── Exception.php
│   ├── Interface.php
│   └── Standard.php

Zend_Controller_Dispatcher_Interface

定义了分发器提供的基本和标准功能。

interface Zend_Controller_Dispatcher_Interface
{
public function formatControllerName($unformatted);
public function formatModuleName($unformatted);
public function formatActionName($unformatted);
public function isDispatchable(Zend_Controller_Request_Abstract $request);
public function setParam($name, $value);
public function setParams(array $params);
public function getParam($name);
public function getParams();
public function clearParams($name = null);
public function setResponse(Zend_Controller_Response_Abstract $response = null);
public function getResponse();
public function addControllerDirectory($path, $args = null);
public function setControllerDirectory($path);
public function getControllerDirectory();
public function dispatch(Zend_Controller_Request_Abstract $request, Zend_Controller_Response_Abstract $response);
public function isValidModule($module);
public function getDefaultModule();
public function getDefaultControllerName();
public function getDefaultAction();
}

Zend_Controller_Dispatcher_Abstract

实现了Zend_Controller_Dispatcher_Interface接口，提供了分发器提供的基本和标准功能的抽象父类。

<?php
/** Zend_Controller_Dispatcher_Interface */
require_once 'Zend/Controller/Dispatcher/Interface.php';
abstract class Zend_Controller_Dispatcher_Abstract implements Zend_Controller_Dispatcher_Interface
{
protected $_defaultAction = 'index';
protected $_defaultController = 'index';
protected $_defaultModule = 'default';
protected $_frontController;
protected $_invokeParams = array();
protected $_pathDelimiter = '_';
protected $_response = null;
protected $_wordDelimiter = array('-', '.');
public function __construct(array $params = array())
{
$this->setParams($params);
}
public function formatControllerName($unformatted)
{
return ucfirst($this->_formatName($unformatted)) . 'Controller';
}
public function formatActionName($unformatted)
{
$formatted = $this->_formatName($unformatted, true);
return strtolower(substr($formatted, 0, 1)) . substr($formatted, 1) . 'Action';
}
public function _verifyDelimiter($spec)
{
if (is_string($spec)) {
return (array) $spec;
} elseif (is_array($spec)) {
$allStrings = true;
foreach ($spec as $delim) {
if (!is_string($delim)) {
$allStrings = false;
break;
}
}
if (!$allStrings) {
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception('Word delimiter array must contain only strings');
}
return $spec;
}
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception('Invalid word delimiter');
}
public function getWordDelimiter()
{
return $this->_wordDelimiter;
}
public function setWordDelimiter($spec)
{
$spec = $this->_verifyDelimiter($spec);
$this->_wordDelimiter = $spec;
return $this;
}
public function getPathDelimiter()
{
return $this->_pathDelimiter;
}
public function setPathDelimiter($spec)
{
if (!is_string($spec)) {
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception('Invalid path delimiter');
}
$this->_pathDelimiter = $spec;
return $this;
}
protected function _formatName($unformatted, $isAction = false)
{
// preserve directories
if (!$isAction) {
$segments = explode($this->getPathDelimiter(), $unformatted);
} else {
$segments = (array) $unformatted;
}
foreach ($segments as $key => $segment) {
$segment    = str_replace($this->getWordDelimiter(), ' ', strtolower($segment));
$segment    = preg_replace('/[^a-z0-9 ]/', '', $segment);
$segments[$key] = str_replace(' ', '', ucwords($segment));
}
return implode('_', $segments);
}
public function getFrontController()
{
if (null === $this->_frontController) {
require_once 'Zend/Controller/Front.php';
$this->_frontController = Zend_Controller_Front::getInstance();
}
return $this->_frontController;
}
public function setFrontController(Zend_Controller_Front $controller)
{
$this->_frontController = $controller;
return $this;
}
public function setParam($name, $value)
{
$name = (string) $name;
$this->_invokeParams[$name] = $value;
return $this;
}
public function setParams(array $params)
{
$this->_invokeParams = array_merge($this->_invokeParams, $params);
return $this;
}
public function getParam($name)
{
if(isset($this->_invokeParams[$name])) {
return $this->_invokeParams[$name];
}
return null;
}
public function getParams()
{
return $this->_invokeParams;
}
public function clearParams($name = null)
{
if (null === $name) {
$this->_invokeParams = array();
} elseif (is_string($name) && isset($this->_invokeParams[$name])) {
unset($this->_invokeParams[$name]);
} elseif (is_array($name)) {
foreach ($name as $key) {
if (is_string($key) && isset($this->_invokeParams[$key])) {
unset($this->_invokeParams[$key]);
}
}
}
return $this;
}
public function setResponse(Zend_Controller_Response_Abstract $response = null)
{
$this->_response = $response;
return $this;
}
public function getResponse()
{
return $this->_response;
}
public function setDefaultControllerName($controller)
{
$this->_defaultController = (string) $controller;
return $this;
}
public function getDefaultControllerName()
{
return $this->_defaultController;
}
public function setDefaultAction($action)
{
$this->_defaultAction = (string) $action;
return $this;
}
public function getDefaultAction()
{
return $this->_defaultAction;
}
public function setDefaultModule($module)
{
$this->_defaultModule = (string) $module;
return $this;
}
public function getDefaultModule()
{
return $this->_defaultModule;
}
}

Zend_Controller_Dispatcher_Standard

ZendFramework继承抽象类Zend_Controller_Dispatcher_Abstract，定义了Zend_Controller_Dispatcher_Standard。Zend_Controller_Dispatcher_Standard是ZendFramework提供的基本的分发器，完成了分发功能。

<?php
/** Zend_Loader */
require_once 'Zend/Loader.php';
/** Zend_Controller_Dispatcher_Abstract */
require_once 'Zend/Controller/Dispatcher/Abstract.php';
class Zend_Controller_Dispatcher_Standard extends Zend_Controller_Dispatcher_Abstract
{
protected $_curDirectory;
protected $_curModule;
protected $_controllerDirectory = array();
public function __construct(array $params = array())
{
parent::__construct($params);
$this->_curModule = $this->getDefaultModule();
}
public function addControllerDirectory($path, $module = null)
{
if (null === $module) {
$module = $this->_defaultModule;
}
$module = (string) $module;
$path  = rtrim((string) $path, '/\\');
$this->_controllerDirectory[$module] = $path;
return $this;
}
public function setControllerDirectory($directory, $module = null)
{
$this->_controllerDirectory = array();
if (is_string($directory)) {
$this->addControllerDirectory($directory, $module);
} elseif (is_array($directory)) {
foreach ((array) $directory as $module => $path) {
$this->addControllerDirectory($path, $module);
}
} else {
require_once 'Zend/Controller/Exception.php';
throw new Zend_Controller_Exception('Controller directory spec must be either a string or an array');
}
return $this;
}
public function getControllerDirectory($module = null)
{
if (null === $module) {
return $this->_controllerDirectory;
}
$module = (string) $module;
if (array_key_exists($module, $this->_controllerDirectory)) {
return $this->_controllerDirectory[$module];
}
return null;
}
public function removeControllerDirectory($module)
{
$module = (string) $module;
if (array_key_exists($module, $this->_controllerDirectory)) {
unset($this->_controllerDirectory[$module]);
return true;
}
return false;
}
public function formatModuleName($unformatted)
{
if (($this->_defaultModule == $unformatted) && !$this->getParam('prefixDefaultModule')) {
return $unformatted;
}
return ucfirst($this->_formatName($unformatted));
}
public function formatClassName($moduleName, $className)
{
return $this->formatModuleName($moduleName) . '_' . $className;
}
public function classToFilename($class)
{
return str_replace('_', DIRECTORY_SEPARATOR, $class) . '.php';
}
public function isDispatchable(Zend_Controller_Request_Abstract $request)
{
$className = $this->getControllerClass($request);
if (!$className) {
return false;
}
$finalClass = $className;
if (($this->_defaultModule != $this->_curModule)
|| $this->getParam('prefixDefaultModule'))
{
$finalClass = $this->formatClassName($this->_curModule, $className);
}
if (class_exists($finalClass, false)) {
return true;
}
$fileSpec  = $this->classToFilename($className);
$dispatchDir = $this->getDispatchDirectory();
$test    = $dispatchDir . DIRECTORY_SEPARATOR . $fileSpec;
return Zend_Loader::isReadable($test);
}
public function dispatch(Zend_Controller_Request_Abstract $request, Zend_Controller_Response_Abstract $response)
{
$this->setResponse($response);
/**
* Get controller class
*/
if (!$this->isDispatchable($request)) {
$controller = $request->getControllerName();
if (!$this->getParam('useDefaultControllerAlways') && !empty($controller)) {
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception('Invalid controller specified (' . $request->getControllerName() . ')');
}
$className = $this->getDefaultControllerClass($request);
} else {
$className = $this->getControllerClass($request);
if (!$className) {
$className = $this->getDefaultControllerClass($request);
}
}
/**
* Load the controller class file
*/
$className = $this->loadClass($className);
/**
* Instantiate controller with request, response, and invocation
* arguments; throw exception if it's not an action controller
*/
$controller = new $className($request, $this->getResponse(), $this->getParams());
if (!($controller instanceof Zend_Controller_Action_Interface) &&
!($controller instanceof Zend_Controller_Action)) {
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception(
'Controller "' . $className . '" is not an instance of Zend_Controller_Action_Interface'
);
}
/**
* Retrieve the action name
*/
$action = $this->getActionMethod($request);
/**
* Dispatch the method call
*/
$request->setDispatched(true);
// by default, buffer output
$disableOb = $this->getParam('disableOutputBuffering');
$obLevel  = ob_get_level();
if (empty($disableOb)) {
ob_start();
}
try {
$controller->dispatch($action);
} catch (Exception $e) {
// Clean output buffer on error
$curObLevel = ob_get_level();
if ($curObLevel > $obLevel) {
do {
ob_get_clean();
$curObLevel = ob_get_level();
} while ($curObLevel > $obLevel);
}
throw $e;
}
if (empty($disableOb)) {
$content = ob_get_clean();
$response->appendBody($content);
}
// Destroy the page controller instance and reflection objects
$controller = null;
}
public function loadClass($className)
{
$finalClass = $className;
if (($this->_defaultModule != $this->_curModule)
|| $this->getParam('prefixDefaultModule'))
{
$finalClass = $this->formatClassName($this->_curModule, $className);
}
if (class_exists($finalClass, false)) {
return $finalClass;
}
$dispatchDir = $this->getDispatchDirectory();
$loadFile  = $dispatchDir . DIRECTORY_SEPARATOR . $this->classToFilename($className);
if (Zend_Loader::isReadable($loadFile)) {
include_once $loadFile;
} else {
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception('Cannot load controller class "' . $className . '" from file "' . $loadFile . "'");
}
if (!class_exists($finalClass, false)) {
require_once 'Zend/Controller/Dispatcher/Exception.php';
throw new Zend_Controller_Dispatcher_Exception('Invalid controller class ("' . $finalClass . '")');
}
return $finalClass;
}
public function getControllerClass(Zend_Controller_Request_Abstract $request)
{
$controllerName = $request->getControllerName();
if (empty($controllerName)) {
if (!$this->getParam('useDefaultControllerAlways')) {
return false;
}
$controllerName = $this->getDefaultControllerName();
$request->setControllerName($controllerName);
}
$className = $this->formatControllerName($controllerName);
$controllerDirs   = $this->getControllerDirectory();
$module = $request->getModuleName();
if ($this->isValidModule($module)) {
$this->_curModule  = $module;
$this->_curDirectory = $controllerDirs[$module];
} elseif ($this->isValidModule($this->_defaultModule)) {
$request->setModuleName($this->_defaultModule);
$this->_curModule  = $this->_defaultModule;
$this->_curDirectory = $controllerDirs[$this->_defaultModule];
} else {
require_once 'Zend/Controller/Exception.php';
throw new Zend_Controller_Exception('No default module defined for this application');
}
return $className;
}
public function isValidModule($module)
{
if (!is_string($module)) {
return false;
}
$module    = strtolower($module);
$controllerDir = $this->getControllerDirectory();
foreach (array_keys($controllerDir) as $moduleName) {
if ($module == strtolower($moduleName)) {
return true;
}
}
return false;
}
public function getDefaultControllerClass(Zend_Controller_Request_Abstract $request)
{
$controller = $this->getDefaultControllerName();
$default  = $this->formatControllerName($controller);
$request->setControllerName($controller)
->setActionName(null);
$module       = $request->getModuleName();
$controllerDirs   = $this->getControllerDirectory();
$this->_curModule  = $this->_defaultModule;
$this->_curDirectory = $controllerDirs[$this->_defaultModule];
if ($this->isValidModule($module)) {
$found = false;
if (class_exists($default, false)) {
$found = true;
} else {
$moduleDir = $controllerDirs[$module];
$fileSpec = $moduleDir . DIRECTORY_SEPARATOR . $this->classToFilename($default);
if (Zend_Loader::isReadable($fileSpec)) {
$found = true;
$this->_curDirectory = $moduleDir;
}
}
if ($found) {
$request->setModuleName($module);
$this->_curModule  = $this->formatModuleName($module);
}
} else {
$request->setModuleName($this->_defaultModule);
}
return $default;
}
public function getDispatchDirectory()
{
return $this->_curDirectory;
}
public function getActionMethod(Zend_Controller_Request_Abstract $request)
{
$action = $request->getActionName();
if (empty($action)) {
$action = $this->getDefaultAction();
$request->setActionName($action);
}
return $this->formatActionName($action);
}
}

前端控制器和分发器

<?php
/** Zend_Loader */
require_once 'Zend/Loader.php';
/** Zend_Controller_Action_HelperBroker */
require_once 'Zend/Controller/Action/HelperBroker.php';
/** Zend_Controller_Plugin_Broker */
require_once 'Zend/Controller/Plugin/Broker.php';
class Zend_Controller_Front
{
protected $_baseUrl = null;
protected $_controllerDir = null;
protected $_dispatcher = null;
protected static $_instance = null;
protected $_invokeParams = array();
protected $_moduleControllerDirectoryName = 'controllers';
protected $_plugins = null;
protected $_request = null;
protected $_response = null;
protected $_returnResponse = false;
protected $_router = null;
protected $_throwExceptions = false;
protected function __construct()
{
$this->_plugins = new Zend_Controller_Plugin_Broker();
}
private function __clone()
{
}
public static function getInstance()
{
if (null === self::$_instance) {
self::$_instance = new self();
}
return self::$_instance;
}
public function resetInstance()
{
$reflection = new ReflectionObject($this);
foreach ($reflection->getProperties() as $property) {
$name = $property->getName();
switch ($name) {
case '_instance':
break;
case '_controllerDir':
case '_invokeParams':
$this->{$name} = array();
break;
case '_plugins':
$this->{$name} = new Zend_Controller_Plugin_Broker();
break;
case '_throwExceptions':
case '_returnResponse':
$this->{$name} = false;
break;
case '_moduleControllerDirectoryName':
$this->{$name} = 'controllers';
break;
default:
$this->{$name} = null;
break;
}
}
Zend_Controller_Action_HelperBroker::resetHelpers();
}
public static function run($controllerDirectory)
{
self::getInstance()
->setControllerDirectory($controllerDirectory)
->dispatch();
}
public function addControllerDirectory($directory, $module = null)
{
$this->getDispatcher()->addControllerDirectory($directory, $module);
return $this;
}
public function setControllerDirectory($directory, $module = null)
{
$this->getDispatcher()->setControllerDirectory($directory, $module);
return $this;
}
public function getControllerDirectory($name = null)
{
return $this->getDispatcher()->getControllerDirectory($name);
}
public function removeControllerDirectory($module)
{
return $this->getDispatcher()->removeControllerDirectory($module);
}
public function addModuleDirectory($path)
{
try{
$dir = new DirectoryIterator($path);
} catch(Exception $e) {
require_once 'Zend/Controller/Exception.php';
throw new Zend_Controller_Exception("Directory $path not readable", 0, $e);
}
foreach ($dir as $file) {
if ($file->isDot() || !$file->isDir()) {
continue;
}
$module  = $file->getFilename();
// Don't use SCCS directories as modules
if (preg_match('/^[^a-z]/i', $module) || ('CVS' == $module)) {
continue;
}
$moduleDir = $file->getPathname() . DIRECTORY_SEPARATOR . $this->getModuleControllerDirectoryName();
$this->addControllerDirectory($moduleDir, $module);
}
return $this;
}
public function getModuleDirectory($module = null)
{
if (null === $module) {
$request = $this->getRequest();
if (null !== $request) {
$module = $this->getRequest()->getModuleName();
}
if (empty($module)) {
$module = $this->getDispatcher()->getDefaultModule();
}
}
$controllerDir = $this->getControllerDirectory($module);
if ((null === $controllerDir) || !is_string($controllerDir)) {
return null;
}
return dirname($controllerDir);
}
public function setModuleControllerDirectoryName($name = 'controllers')
{
$this->_moduleControllerDirectoryName = (string) $name;
return $this;
}
public function getModuleControllerDirectoryName()
{
return $this->_moduleControllerDirectoryName;
}
public function setDefaultControllerName($controller)
{
$dispatcher = $this->getDispatcher();
$dispatcher->setDefaultControllerName($controller);
return $this;
}
public function getDefaultControllerName()
{
return $this->getDispatcher()->getDefaultControllerName();
}
public function setDefaultAction($action)
{
$dispatcher = $this->getDispatcher();
$dispatcher->setDefaultAction($action);
return $this;
}
public function getDefaultAction()
{
return $this->getDispatcher()->getDefaultAction();
}
public function setDefaultModule($module)
{
$dispatcher = $this->getDispatcher();
$dispatcher->setDefaultModule($module);
return $this;
}
public function getDefaultModule()
{
return $this->getDispatcher()->getDefaultModule();
}
public function setRequest($request)
{
...........................
return $this;
}
public function getRequest()
{
return $this->_request;
}
public function setRouter($router)
{
....................
return $this;
}
public function getRouter()
{
..................
return $this->_router;
}
public function setBaseUrl($base = null)
{
..............
return $this;
}
public function getBaseUrl()
{
return $this->_baseUrl;
}
/**
* Set the dispatcher object. The dispatcher is responsible for
* taking a Zend_Controller_Dispatcher_Token object, instantiating the controller, and
* call the action method of the controller.
*
* @param Zend_Controller_Dispatcher_Interface $dispatcher
* @return Zend_Controller_Front
*/
public function setDispatcher(Zend_Controller_Dispatcher_Interface $dispatcher)
{
$this->_dispatcher = $dispatcher;
return $this;
}
/**
* Return the dispatcher object.
*
* @return Zend_Controller_Dispatcher_Interface
*/
public function getDispatcher()
{
/**
* Instantiate the default dispatcher if one was not set.
*/
if (!$this->_dispatcher instanceof Zend_Controller_Dispatcher_Interface) {
require_once 'Zend/Controller/Dispatcher/Standard.php';
$this->_dispatcher = new Zend_Controller_Dispatcher_Standard();
}
return $this->_dispatcher;
}
public function setResponse($response)
{..................
return $this;
}
public function getResponse()
{
return $this->_response;
}
public function setParam($name, $value)
{
$name = (string) $name;
$this->_invokeParams[$name] = $value;
return $this;
}
public function setParams(array $params)
{
$this->_invokeParams = array_merge($this->_invokeParams, $params);
return $this;
}
public function getParam($name)
{
if(isset($this->_invokeParams[$name])) {
return $this->_invokeParams[$name];
}
return null;
}
public function getParams()
{
return $this->_invokeParams;
}
public function clearParams($name = null)
{
if (null === $name) {
$this->_invokeParams = array();
} elseif (is_string($name) && isset($this->_invokeParams[$name])) {
unset($this->_invokeParams[$name]);
} elseif (is_array($name)) {
foreach ($name as $key) {
if (is_string($key) && isset($this->_invokeParams[$key])) {
unset($this->_invokeParams[$key]);
}
}
}
return $this;
}
public function registerPlugin(Zend_Controller_Plugin_Abstract $plugin, $stackIndex = null)
{
$this->_plugins->registerPlugin($plugin, $stackIndex);
return $this;
}
public function unregisterPlugin($plugin)
{
$this->_plugins->unregisterPlugin($plugin);
return $this;
}
public function hasPlugin($class)
{
return $this->_plugins->hasPlugin($class);
}
public function getPlugin($class)
{
return $this->_plugins->getPlugin($class);
}
public function getPlugins()
{
return $this->_plugins->getPlugins();
}
public function throwExceptions($flag = null)
{
.....................
return $this->_throwExceptions;
}
public function returnResponse($flag = null)
{
................
return $this->_returnResponse;
}
/**
* Dispatch an HTTP request to a controller/action.
*
* @param Zend_Controller_Request_Abstract|null $request
* @param Zend_Controller_Response_Abstract|null $response
* @return void|Zend_Controller_Response_Abstract Returns response object if returnResponse() is true
*/
public function dispatch(Zend_Controller_Request_Abstract $request = null, Zend_Controller_Response_Abstract $response = null)
{
if (!$this->getParam('noErrorHandler') && !$this->_plugins->hasPlugin('Zend_Controller_Plugin_ErrorHandler')) {
// Register with stack index of 100
require_once 'Zend/Controller/Plugin/ErrorHandler.php';
$this->_plugins->registerPlugin(new Zend_Controller_Plugin_ErrorHandler(), 100);
}
if (!$this->getParam('noViewRenderer') && !Zend_Controller_Action_HelperBroker::hasHelper('viewRenderer')) {
require_once 'Zend/Controller/Action/Helper/ViewRenderer.php';
Zend_Controller_Action_HelperBroker::getStack()->offsetSet(-80, new Zend_Controller_Action_Helper_ViewRenderer());
}
/**
* Instantiate default request object (HTTP version) if none provided
*/
if (null !== $request) {
$this->setRequest($request);
} elseif ((null === $request) && (null === ($request = $this->getRequest()))) {
require_once 'Zend/Controller/Request/Http.php';
$request = new Zend_Controller_Request_Http();
$this->setRequest($request);
}
/**
* Set base URL of request object, if available
*/
if (is_callable(array($this->_request, 'setBaseUrl'))) {
if (null !== $this->_baseUrl) {
$this->_request->setBaseUrl($this->_baseUrl);
}
}
/**
* Instantiate default response object (HTTP version) if none provided
*/
if (null !== $response) {
$this->setResponse($response);
} elseif ((null === $this->_response) && (null === ($this->_response = $this->getResponse()))) {
require_once 'Zend/Controller/Response/Http.php';
$response = new Zend_Controller_Response_Http();
$this->setResponse($response);
}
/**
* Register request and response objects with plugin broker
*/
$this->_plugins
->setRequest($this->_request)
->setResponse($this->_response);
/**
* Initialize router
*/
$router = $this->getRouter();
$router->setParams($this->getParams());
/**
* Initialize dispatcher
*/
$dispatcher = $this->getDispatcher();
$dispatcher->setParams($this->getParams())
->setResponse($this->_response);
// Begin dispatch
try {
/**
* Route request to controller/action, if a router is provided
*/
/**
* Notify plugins of router startup
*/
$this->_plugins->routeStartup($this->_request);
try {
$router->route($this->_request);
} catch (Exception $e) {
if ($this->throwExceptions()) {
throw $e;
}
$this->_response->setException($e);
}
/**
* Notify plugins of router completion
*/
$this->_plugins->routeShutdown($this->_request);
/**
* Notify plugins of dispatch loop startup
*/
$this->_plugins->dispatchLoopStartup($this->_request);
/**
* Attempt to dispatch the controller/action. If the $this->_request
* indicates that it needs to be dispatched, move to the next
* action in the request.
*/
do {
$this->_request->setDispatched(true);
/**
* Notify plugins of dispatch startup
*/
$this->_plugins->preDispatch($this->_request);
/**
* Skip requested action if preDispatch() has reset it
*/
if (!$this->_request->isDispatched()) {
continue;
}
/**
* Dispatch request
*/
try {
$dispatcher->dispatch($this->_request, $this->_response);
} catch (Exception $e) {
if ($this->throwExceptions()) {
throw $e;
}
$this->_response->setException($e);
}
/**
* Notify plugins of dispatch completion
*/
$this->_plugins->postDispatch($this->_request);
} while (!$this->_request->isDispatched());
} catch (Exception $e) {
if ($this->throwExceptions()) {
throw $e;
}
$this->_response->setException($e);
}
/**
* Notify plugins of dispatch loop completion
*/
try {
$this->_plugins->dispatchLoopShutdown();
} catch (Exception $e) {
if ($this->throwExceptions()) {
throw $e;
}
$this->_response->setException($e);
}
if ($this->returnResponse()) {
return $this->_response;
}
$this->_response->sendResponse();
}
}

以上对Zend_Controller_Front和Zend_Controller_Dispatcher做了简单的标记，通过分析代码不难看出，基本的运行机制。

分发发生在前端控制器中的一个循环（loop）中。分发之前，前端控制器通过路由请求，找到用户指定的模块、控制器、动作和可选参数。然后进入分发循环，分发请求。

分发器需要大量数据完成任务――它需要知道如何格式化控制器和动作的名称，到哪儿找到控制器类文件，模块名是否有效，以及基于其它可用信息判定请求是否能分发的API。

每次迭代（iteration）过程开始时，在请求对象中设置一个标志指示该动作已分发。如果在动作或者前/后分发（pre/postDispatch）插件重置了该标志，分发循环将继续下去并试图分发新的请求。通过改变请求中的控制器或者动作并重置已分发标志，开发人员可以定制执行一个请求链。

控制这种分发过程的动作控制器方法是_forward()；在任意的pre/postDispatch()或者动作中调用该方法，并传入动作、控制器、模块、以及可选的附加参数，就可以进入新的动作。

自定义分发器

Zend_Controller_Dispatcher_Interface定义了下列所有分发器需要实现的方法。

不过大多数情况下，只需要简单地扩展抽象类Zend_Controller_Dispatcher_Abstract，其中已经定义好了上面的大部分方法。或者扩展Zend_Controller_Dispatcher_Standard类，基于标准分发器来修改功能。

需要子类化分发器的可能原因包括：期望在动作控制器中使用不同的类和方法命名模式，或者期望使用不同的分发方式，比如分发到控制器目录下的动作文件，而不是控制器类的动作方法。

更多关于zend相关内容感兴趣的读者可查看本站专题：《Zend FrameWork框架入门教程》、《php优秀开发框架总结》、《Yii框架入门及常用技巧总结》、《ThinkPHP入门教程》、《php面向对象程序设计入门教程》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》

希望本文所述对大家PHP程序设计有所帮助。

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