I just posted this in a similar thread a few minutes ago. This should work.
http://laravel.io/forum/08-06-2014-checking-laravel-auth-in-subdomain-wordpress#reply-16427
Edit: just re-read your thread and not sure if you are implying this is what you need, or if it's the inverse logic. If you are looking for the latter, I can't help with that. Sorry if I misunderstood the question.
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