Add a Token to a Form
(Chapter 2, Forms and URLs - Pg 28)
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<?php
session_start();
$token = md5(uniqid(rand(), TRUE));
$_SESSION['token'] = $token;
$_SESSION['token_time'] = time();
?>
<form action="buy.php" method="POST">
<input type="hidden" name="token" value="<?php echo $token; ?>" />
<p>
Item:
<select name="item">
<option name="pen">pen</option>
<option name="pencil">pencil</option>
</select><br />
Quantity: <input type="text" name="quantity" /><br />
<input type="submit" value="Buy" />
</p>
</form>
