Here, both have drawbacks:

- the bootstrap file contains classes so requiring it several times is a fatal error
- using require_once, ``$loader`` will be ``null`` if it is already required, thus breaking the ApcClassLoader setup.

I guess the proper way to solve it would be to get the loader from ``vendor/autoload.php`` directly as the file generated by Composer is designed to be able to require it as often as needed (and returning the same loader each time)