Cake 1.3 app_error

<?php

class AppError extends ErrorHandler {


    function missingController($params){
        //echo 'missing controller';
        $this->error404($params);
    }


    function missingAction($params){//if debug is greater than 0 this will kick in. Production should be 0 (which will error404())
        echo 'missing action';
        //$this->error404($params);
    }

    function error404($params){

        extract($params);
        //fb($params);
        App::import('Tracking');
        //App::import('Session');
        $track = new TrackingComponent;

        //fb($url,'non-normalized');
        $url = Router::normalize($url);
            //fb($url,'normalized');
        //get source
        $source = $track->getAliasSource($url);
        if($source){//does this url exist in the alias database? if so get source
            //fb($source,'SourceCode');
            $redirectURL = $track->getAliasURL($source);
            //fb('The alias URL for '.$source.' is '.$redirectURL);
        } else {//theres no source/alias - check for alternative URL using keywords table eg. 'handsets' 'worldphone'
            //fb($url,'The is no source,Checking For substitute');
            $redirectURL = $track->substituteURL($url);
            //as its not a true page, log it in the 404 'broken links' table
            //($redirectURL) ? fb($redirectURL,'Yes') : fb('No Substitute, 404 iminent') ;
            //fb('Tracking '.$url.' as a broken link in 404 table');
            //$track->track404($url);
        }
        //so at this point we should have a redirectURL, or if not it really is a 404.
        //if we do have a redirect url...
        if($redirectURL) {
                //fb('Theres a redirect URL',$redirectURL);
                //check visitors ip address to see if its one of ours
                $this->controller->Session->write("ourIP",$ourIP = $track->checkIP( env('REMOTE_ADDR') ));
                //fb($ourIP,'Have just checked ourIP and written to session value');

                if(!$ourIP){//its not one of ours, treat as a customer.
                    //fb('Its not our IP, so its a customer');
                    //check to see if they have been dealt with yet - is it a new visit?
                    if(!$this->controller->Session->check("visitor")){//new visitor
                        //fb('Theres no session value set');
                        //track visitor in visitors table (user agent, ip etc)
                        //fb('Its a customer, there is a redirect URL, and this is their first page on the site. We track them.');
                        //is there a visitor cookie?
                        if($this->controller->Cookie->read('visitor')){
                            //yes
                            $visitorId = $track->trackVisitor($url,$this->controller->Cookie->read('visitor'));
                        }else{
                            //no
                            //insert visitor and grab visitorId ready to write into session and cookie
                            $visitorId = $track->trackVisitor($url);
                        }
                        //fb('writing cookie');
                        $this->controller->Cookie->name = 'Mobal';
                        $this->controller->Cookie->time = 3600; // or '1 hour'
                        $this->controller->Cookie->domain = '.mobal.com';//env('SERVER_NAME');
                        $this->controller->Cookie->write('visitor',$visitorId,false,'90 days');
                        //fb('setting session');
                        $this->controller->Session->write('visitor',$visitorId);

                        //track visit & write session
                        //check for source

                        if($source){//track source
                            //fb($source,'Track dat source homey');
                            $track->trackSource($visitorId,$source);
                            //fb('Source Tracked! using '.$visitorId);
                        }
                    } //else { fb('Already been, so dont track');}
                }
            //redirect
            //fb('301 Redirecting to '.$redirectURL);
            $this->controller->redirect($redirectURL,301);

            }else{ //no urls match:404 time
                $track->track404($url);
                $this->controller->layout = '404';
                $this->controller->set(array(
                    'url' => $url,
                    'title' =>'Page cannot be found'
                ));
                header("HTTP/1.0 404 Not Found");
                $this->_outputMessage('missing');
            }
        }
    }
?>