lucy24 - 10:08 am on Feb 22, 2013 (gmt 0)
Don't even let the robots get close to your php. If they're not whitelisted, slam a 403 in their face.
If the site requires a login, do you need to admit any robots anywhere? Don't know about anyone else, but as a user it makes me insane when something comes up in a search engine and when I go there it turns out I have to log in. And they don't just want my name, they want money. Sorry, site, but you're just not that desirable.