Simple autoloader for XHP in Laravel

XHPServiceProvider.php

<?php
/**
 * Simple autoloader for XHP in Laravel, when you don't want to use Composer's 
 * autoloader. To use:
 * 1. Place this file somewhere in an autoloader-enabled directory of your 
 *    Laravel installation  (app/controllers is fine).
 * 2. Modify `app/config/app.php` and add 'XHP\XHPServiceProvider' to the 
 *    "Autoloaded Service Providers" section.
 *
 * More info on XHP in Laravel: http://dan.cx/2014/05/xhp-laravel
 */

namespace XHP;

use Illuminate\Support\ServiceProvider;

class XHPServiceProvider extends ServiceProvider {
  const CLASS_PREFIX = 'xhp_';

  public function register() {
    spl_autoload_register(function($className) {
      if (static::isXHPClass($className)) {
        $filename = static::classToFilename($className);
        $path = $this->app['view.finder']->find($filename);
        require $path;
        return true;
      }
      return false;
    });
  }

  public static function isXHPClass($className) {
    $prefix = substr($className, 0, strlen(static::CLASS_PREFIX));
    return $prefix === static::CLASS_PREFIX;
  }

  public static function classToFilename($className) {
    return str_replace(
      array('__', '_'),
      array('/', '-'),
      substr($className, strlen(static::CLASS_PREFIX))
    );
  }
}