I'm giggling at the thought of this set up the same way as the [censored] sites, just so you know. XD
I do know "Gaia", which is php based, has several sorts of bot-moniters. If you don't know how Gaia works, they give you "virtual gold" for every page you go to. This is rife for people to abuse, obviously. So they have bots to catch the bots, as it were.