args in a Laravel 4 auth filter

gistfile1.php

<?php

// in my controller constructor, I apply a filter with arguments:
$this->beforeFilter('auth.hasRole:admin,staff,developer', ['except' => 'getLogoutas',]);

// in my global filters.php
/**
 * Verify that the logged-in user has a specified role
 */
Route::filter('auth.hasRole', function($route, $request, $value)
{
	if (! Auth::check() OR ! Auth::user()->hasRole($value)) {
        return Response::json(['flash' => __('application.access_denied'),],403);
    }
});


// in User.php model (this could easily be a trait or abstracted to a service)
 public function hasRole($key)
 {
    return $this->hasAnyRole(explode(',',$key));
 }

 public function hasAnyRole($keys)
 {
     if( ! is_array($keys))
     {
         $keys = func_get_args();
     }

     foreach($this->roles as $role)
     {
         if(in_array($role->keyname, $keys))
         {
             return true;
         }
     }

     return false;
 }