PROSAGA码农传奇-恶意代码防范-多重投票防止代码使用户可以投票两次

<p>我有一个upvote按钮和一个downvote按钮，并且我试图使用cookie阻止同一用户在已经投票后投票，但是我的代码允许他们在投票按钮变灰之前准确地投票两次。我的代码有什么问题？</p>
<pre><code><html>
<form action="" method="post">
<input type="hidden" name="action" value="submit"/>
<input id="upvote" type="submit" name="submit" value="Upvote" 
    <?php 
    if (isset($_COOKIE['chocolatechip']) and $_COOKIE['chocolatechip'] = 
"voted=1") 
        {
        echo "disabled";
        } 
    ?>>
<input id="downvote" type="submit" name="submit" value="Downvote"
    <?php 
    if (isset($_COOKIE['chocolatechip']) and $_COOKIE['chocolatechip'] = 
"voted=1") 
        {
        echo "disabled";
        } 
    ?>>
</form>
</html>

<?php

if (isset($_POST['action']))
{
if ($_POST['submit'] == "Upvote") // if upvoted clicked
    {
    mysqli_query($conn,"UPDATE object_votes_table SET upvotes = upvotes + 1 
WHERE object = 'Ceramic'");
    setcookie('chocolatechip', 'voted=1');
    }
if ($_POST['submit'] == "Downvote") // if downvoted clicked
    {
    mysqli_query($conn,"UPDATE object_votes_table SET downvotes = downvotes 
+ 1 WHERE object = 'Ceramic'");
    setcookie('chocolatechip', 'voted=1');
    }
}
?>
</code></pre>