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1PHP hashing input field names
2$time = mktime(); 
3$first_name = md5($time + 'first_name');
4	
5<form action="register.php" method="post">
6<input type="text" name="<?php echo $first_name ?>" >
7<input type="hidden" name="check" value="<?php echo $time ?>" >
8<input type="submit" name="register">
9</form>
10	
11// check to see if there is a timestamp
12if (isset($_POST['check'])) {
13    $time = strtotime($_POST['check']);
14
15    if (time() < $time) {
16    // original timestamp is in the future, this is wrong
17    }
18
19    if (time() - $time < 60) {
20    // form was filled out too fast, less than 1 minute?
21    }
22
23    // otherwise
24    $key = $_POST['check'];
25
26    if (md5($key + 'first_name') == $_POST['whatever-the-hash-on-the-first_name-field-was']) {
27        // process first_name field?
28    }
29}
30	
31<form action="register.php" method="post">
32<? $timestamp = time() ?>
33<!-- This is where the user would put the email. Don't put this comment in for real -->
34<input type="text" name="<?php echo md5("email" . $timestamp . $secretKey) ?>" >
35<input type="hidden" name="check" value="<?php echo $timestamp ?>" >
36<input type="submit" name="register">
37</form>
38	
39<?
40    if (isset($_POST['check'])) {
41        $email = $_POST[md5("email" . $_POST['check'] . $secretKey)];
42    }
43?>