Add Trailing Slash to CakePHP

AppHelper.php

<?php
class AppHelper extends Helper { 
    function url($url = null, $full = false) { 
        $routerUrl = Router::url($url, $full); 
        if (!preg_match('/\\.(rss|html|js|css|jpeg|jpg|gif|png|xml?)$/', strtolower($routerUrl)) && substr($routerUrl, -1) != '/') { 
            $routerUrl .= '/'; 
        } 
        return $routerUrl; 
    } 
}