install_begin_request($class_loader, &$install_state)
Begins an installation request, modifying the installation state as needed.
This function performs commands that must run at the beginning of every page request. It throws an exception if the installation should not proceed.
Parameters
$class_loader: The class loader. Normally Composer's ClassLoader, as included by the front controller, but may also be decorated; e.g., \Symfony\Component\ClassLoader\ApcClassLoader.
$install_state: An ar