standard.php

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            $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) {
            require_once 'Zend/Controller/Dispatcher/Exception.php';
            throw new Zend_Controller_Dispatcher_Exception("Controller '$className' is not an instance of Zend_Controller_Action");
        }

        /**
         * 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;
    }

    /**
     * Load a controller class
     *
     * Attempts to load the controller class file from
     * {@link getControllerDirectory()}.  If the controller belongs to a
     * module, looks for the module prefix to the controller class.
     *
     * @param string $className
     * @return string Class name loaded
     * @throws Zend_Controller_Dispatcher_Exception if class not loaded
     */
    public function loadClass($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);
        $dir         = dirname($loadFile);
        $file        = basename($loadFile);

        try {
            Zend_Loader::loadFile($file, $dir, true);
        } catch (Zend_Exception $e) {
            require_once 'Zend/Controller/Dispatcher/Exception.php';
            throw new Zend_Controller_Dispatcher_Exception('Cannot load controller class "' . $className . '" from file "' . $file . '" in directory "' . $dir . '"');
        }

        if (!class_exists($finalClass, false)) {
            require_once 'Zend/Controller/Dispatcher/Exception.php';
            throw new Zend_Controller_Dispatcher_Exception('Invalid controller class ("' . $finalClass . '")');
        }

        return $finalClass;
    }

    /**
     * Get controller class name
     *
     * Try request first; if not found, try pulling from request parameter;
     * if still not found, fallback to default
     *
     * @param Zend_Controller_Request_Abstract $request
     * @return string|false Returns class name on success
     */
    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;
    }

    /**
     * Determine if a given module is valid
     *
     * @param string $module
     * @return bool
     */
    public function isValidModule($module)
    {
        $controllerDir = $this->getControllerDirectory();
        return (is_string($module) && isset($controllerDir[$module]));
    }

    /**
     * Retrieve default controller class
     *
     * Determines whether the default controller to use lies within the
     * requested module, or if the global default should be used.
     *
     * By default, will only use the module default unless that controller does
     * not exist; if this is the case, it falls back to the default controller
     * in the default module.
     *
     * @param Zend_Controller_Request_Abstract $request
     * @return string
     */
    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;
    }

    /**
     * Return the value of the currently selected dispatch directory (as set by
     * {@link getController()})
     *
     * @return string
     */
    public function getDispatchDirectory()
    {
        return $this->_curDirectory;
    }

    /**
     * Determine the action name
     *
     * First attempt to retrieve from request; then from request params
     * using action key; default to default action
     *
     * Returns formatted action name
     *
     * @param Zend_Controller_Request_Abstract $request
     * @return string
     */
    public function getActionMethod(Zend_Controller_Request_Abstract $request)
    {
        $action = $request->getActionName();
        if (empty($action)) {
            $action = $this->getDefaultAction();
            $request->setActionName($action);
        }

        return $this->formatActionName($action);
    }
}