如何调试“；最长执行时间“；致命错误

我正在尝试在我的应用程序中使用Zend_acl。我遵循了《Zend框架在行动》一书。我添加了这个助手：

<?php
/**
* Zend Framework
*
* LICENSE "removed for clarity"
*
/** Zend_Controller_Action_Helper_Abstract */
require_once 'Zend/Controller/Action/Helper/Abstract.php';

class Bravo_Controller_Action_Helper_Acl extends Zend_Controller_Action_Helper_Abstract
{
    protected $_action;
    protected $_auth;
    protected $_acl;
    protected $_controllerName;
    public function __construct(Zend_View_Interface $view = null, array $options = array())
    {
        $this->_auth = Zend_Auth::getInstance();
        $this->_acl = $options['acl'];
        //var_dump($this->_acl);die();
    }
    public function init()
    {
        $this->_action = $this->getActionController();
        // add resource for this controller
        $controller = $this->_action->getRequest()->getControllerName();
        if(!$this->_acl->has($controller)) {
            $this->_acl->add(new Zend_Acl_Resource($controller));
        }
    }
    public function preDispatch()
    {
        $role = 'guest';
        if ($this->_auth->hasIdentity()) {
            $user = $this->_auth->getIdentity();
            if(is_object($user)) {
                $role = $this->_auth->getIdentity()->getUral()->getUralAccessNbr();
            }
        }
        $request = $this->_action->getRequest();
        $controller = $request->getControllerName();
        $action = $request->getActionName();
        $module = $request->getModuleName();
        $this->_controllerName = $controller;
        $resource = $controller;
        $privilege = $action;
        if (!$this->_acl->has($resource)) {
            $resource = null;
        }
        //** EDIT: During my test, the user isn't allowed. I'm now suspecting the 4 requests setting to be wrong.
        if (!$this->_acl->isAllowed($role, $resource, $privilege)) {
            $request->setModuleName('default');
            $request->setControllerName('login');
            $request->setActionName('login');
            $request->setDispatched(false);            
        }
    }

    public function allow($roles = null, $actions = null)
    {
        $resource = $this->_controllerName;
        $this->_acl->allow($roles, $resource, $actions);
        return $this;
    }
    public function deny($roles = null, $actions = null)
    {
        $resource = $this->_controllerName;
        $this->_acl->deny($roles, $resource, $actions);
       return $this;
    }
}

和引导程序：

<?php
class Agenda_Bootstrap extends Zend_Application_Module_Bootstrap
{
    protected function _initAcl()
    {
        // acl action helper
        $acl = new Bravo_Acl_Acl();
        $aclHelper = new Bravo_Controller_Action_Helper_Acl(null, array('acl' => $acl));
        Zend_Controller_Action_HelperBroker::addHelper($aclHelper);
    }
}

控制器中未使用Helper。我试了试我的应用程序，看看是否一切正常，我得到了这个错误：

致命错误：第171行的/usr/share/php/ZendFramework-1.11.11/Zend/Filter/PregReplace.php中超过了30秒的最长执行时间

使用此调用堆栈：

Call Stack
#   Time    Memory  Function                                                Location
1   0.0001  314556  {main}( )                                               ../index.php:0
2   0.3275  2039356 Zend_Application->run( )                                ../index.php:29
3   0.3275  2039356 Zend_Application_Bootstrap_Bootstrap->run( )                ../Application.php:366
4   0.3276  2039412 Zend_Controller_Front->dispatch( )                      ../Bootstrap.php:97
5   31.7462 4813252 Zend_Controller_Dispatcher_Standard->dispatch( )        ../Front.php:954
6   31.7470 4813944 Zend_Controller_Action->__construct( )                      ../Standard.php:268
7   31.7470 4814144 Zend_Controller_Action_HelperBroker->__construct( )     ../Action.php:132
8   31.7472 4814924 Zend_Controller_Action_Helper_ViewRenderer->init( )     ../HelperBroker.php:253
9   31.7472 4814924 Zend_Controller_Action_Helper_ViewRenderer->initView( )     ../ViewRenderer.php:516
10  31.7473 4815260 Zend_Controller_Action_Helper_ViewRenderer->_getBasePath( ) ../ViewRenderer.php:469
11  31.7478 4815628 Zend_Filter_Inflector->filter( )                        ../ViewRenderer.php:393
12  31.7489 4816768 Zend_Filter_Word_CamelCaseToSeparator->filter( )        ../Inflector.php:473
13  31.7489 4816768 Zend_Filter_PregReplace->filter( )               ../CamelCaseToSeparator.php:46

我试图增加max_execution_time，但它总是一样的：前四个堆栈仍然不变，第五个堆栈反映了max_execution_time（30秒=>31.7462，40秒=>42.6546，依此类推）

所以我怀疑Zend_Controller_Front->dispatch( )是我的问题来源，但为什么它总是需要最长的时间？我有点困惑。有人知道我应该在哪里挖掘吗？

编辑：我将在调试中走得更远。当用户不被允许时，我现在怀疑我的助手中的4个请求设置是错误的。我也编辑了助手代码并添加了一条注释。

第二版：帕特里克，你说得太对了！！！我重新检查了一下，陷入了一个无限循环：不要访问登录页面=>转到登录页面：-D今天真是浪费时间。。。不管怎样，它的结局很好，谢谢大家。