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Message: <blockquote data-quote="Heaplink" data-source="post: 203084" data-attributes="member: 8966">Habbo uses a whole other approach, through their flash client. Since you wan't to prevent spam in an PHP application, it's a whole other story. It's not easy to make sure a user doesn't spam with just Javascript (it's client-side, don't trust your users in anything) so you will use PHP as your server-side to validate the input and timestamp etc. Something like: If the date of the last message sent by user is < minimum wait date then abort the insertion - otherwise go on.</blockquote>