I encountered the following problem when writing a CompilerPass that reconfigures a services based on whether a certain parameter is checked. The CompilerPass looks something like this:

<?php
namespace AppBundle\DependencyInjection\Compiler;

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;

class SomeCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        if ($container->getParameter('env(SOME_PARAMETER)') == false) {
            return;
        }
        if ($container->hasDefinition('app.some_service')) {
            // TODO Interact with service
        }
    }
}

The parameter is set in my parameters.yml like this:

env(SOME_PARAMETER): false

Checking it after the Container is compiled (e.g. in a Controller) works fine, but in the Compiler Pass instead of the expected value false getParameter will return something like: env_SOME_PARAMETER_d163dacb55d3a0dfb9e6236feba2ec26.

I have also tried setting the environment variable with the same effect. The same condition using a "regular" parameter without env() will return the expected value.