I have a basic php contact page on my website. When the user fills it out and clicks submit it sends me an e-mail. I'm looking to have it modified where a visitor can only click submit 2 times max in a 24 hours period. This is to prevent visitor spamming. Perhaps limit submit's by IP? I'm also looking to have the contact info stored in my sql database which it currently is not. I have only 3 fields. E-mail, Name, and Comments, but I would also like to store IP, Time and...