A while back someone posted a script that checked how quickly a form was submitted.

 

I thought I'd saved it in a safe place but obviously didn't as I can't find it.

 

Anyone remember who it was and where they posted the code?

I'm pretty sure @@BrowserBugs has built something like this before.

Yes, I thought it was him but I can't find the thread where he posted the code

It's this function ...

<?php
function spawnSecure($var) { 
	$spawn = trim(stripslashes($var)); $now = date('Y-m-d H:i:s'); $diff = strtotime($now) - strtotime($spawn);
	if($diff<=1.5) { return false; } else { return true; }
}
?>

... the difference here is 1.5 seconds, but this can be adjusted to your needs. All you need to do is add a form field ...

<input type="hidden" name="anything" value="<?php echo date('Y-m-d H:i:s'); ?>">

... then grab it when posted and check if it was too quick ...

<?php
if(!spawnSecure($_POST['anything'])) {
    $err_msg = "<b>Error!</b> - This appears to be an automated attempt, please take your time or call for assistance.";
}

That's the bunny!

 

Thanks.