CakePHP force trailing slash

AppController.php

<?php

App::uses('TrailingSlashUtil', 'Lib');
App::uses('Controller', 'Controller');

class AppCpontroller extends Controller {
  
  public function redirect ($url, $status = null, $exit = true) {
    $url = TrailingSlashRouter::url($url);
    
    return parent::redirect($url, $status, $exit);
  }
  
}

AppHelper.php

<?php

App::uses('TrailingSlashUtil', 'Lib');
App::uses('Helper', 'Helper');

class AppHelper extends Helper {
  
  public function url ($url = null, $full = false) {
    $url = TrailingSlashRouter::url($url);
    
    return parent::url($url, $full);
  }
  
}

TrailingSlashRouter.php

<?php

App::uses('Router', 'Routing');

class TrailingSlashUtil{
  
  public static function url($url = null, $full = null) {
    $matches = array();
    preg_match('`^(.*)((?:[^/]*\..*)?(?:\?.*)?(?:#.*)?)$`U', Router::url($url), $matches);
    list(, $url, $queryString) = $matches;
    
    if (substr($url, -1) !== '/') {
      $url .= '/';
    }
    
    return $url . $queryString;
  }
  
}