1. Add this bundle and the HTMLPurifier to your project as Git submodules:

    $ git submodule add git://github.com/Exercise/HTMLPurifierBundle.git vendor/bundles/Exercise/HTMLPurifierBundle
    $ git submodule add git://github.com/ezyang/htmlpurifier.git vendor/htmlpurifier
   

2. Add the HTMLPurifier prefix to the src/autoload.php file:

   $loader->registerPrefixes(array( // ... 'HTMLPurifier' => DIR.'/vendor/htmlpurifier/library', // ... ));

3. Add this bundle to your application's kernel:

    // application/ApplicationKernel.php
    public function registerBundles()
    {
        return array(
            // ...
            new Exercise\HTMLPurifierBundle\ExerciseHTMLPurifierBundle(),
            // ...
        );
    }
   

When using HTMLPurifier caching HTMLPurifier complains when the dir isnt availible therefor this bundle includes a CacheWarmer that will create a %kernel.cache_dir%/htmlpurifier directory to prevent this. But this require the config for caching be set as follows.

exercise_html_purifier:
    your_config_name:
        Cache.SerializerPath: %kernel.cache_dir%/htmlpurifier