extending laravel 4 validation

ExtendedValidator.php

<?php namespace Vendor\Package;

use Illuminate\Validation\Validator;

class ExtendedValidator extends Validator
{
  // use validation rule "foo" to use
  public function validateFoo($attribute, $value, $parameters)
  {
    return $value == "foo";
  }
  // add more validation rules
}

/**
 * In your service provider, registered in app/config/app.php add
 * @info please note this is a different php file!
 */
//.. opening php tag and namespace definition see above

use Illuminate\Support\ServiceProvider;

class PackageServiceProvider extends ServiceProvider
{
  public function register()
  {
    Validator::resolver(function($translator, $data, $rules, $messages)
    {
      return new ExtendedValidator($translator, $data, $rules, $messages);
    });
  }
}