.env - variable prefix

Hi, I deployed my Laravel app to shared hosting and encountered a problem with env variables. The provider only allows variables with 'PHP_' prefix due to security reasons. Is it possible or would it be possible to add to Laravel to set the prefix for these variables? For now I changed the Illuminate\Foundation\helpers.php file's method env() and added:

$value = getenv($key);
        if ($value === false) {
            $value = getenv("PHP_" . $key);
            if ($value === false)
                return value($default);
        }

It works, but it will be overwritten after composer update. I'm not sure if this is common approach for other hosting providers aswell, so if it would be useful to add to Laravel for the others. Thanks.