Any way to change behavior depending on if this site has been here in X secs

[jcpunk]

I have a form mail system setup internally.  It is as locked down as I can make it (only access is from inside, only able to email certain individuals, and a captacha).  Users are complaining about the captacha.  In the past we had a very smart spam bot infecting a computer that used the system to send spam.  I intend not to be a spam gateway.

 

So, is there any way (non session and non database) to say "Hey this user has visited this site within 300 seconds of their last visit, I wonder if they are a spam bot?  Lets toss the captcha out there to find out."

 

I cannot do session based stuff, because bots generally don't honor session cookies and that is what I am trying to prevent from using this.  I don't want to put together a database because then I have to clean out old rows after my window expires.

 

I am totally out of ideas on this one.... anybody got one?

[kratsg]

store their IP address and their last message sent.

 

Then, just check current time with the IP address to see if enough time has passed or not.

[jcpunk]

store their IP address and their last message sent.

 

Then, just check current time with the IP address to see if enough time has passed or not.

 

Where would you recommend I store this data?

[MmmVomit]

In the SESSION array.