如何使用ReCaptcha与PHP评论表单使用单页验证

我已经成功地在我的电子邮件表单中使用了ReCaptcha，但是我的评论部分不断收到垃圾邮件，所以我想在那里使用它。

然而，我不确定如何实现验证码验证码。

我的电子邮件表单使用第二个页面来发布数据，所以它工作得很好，但是我的评论表单有所有的php代码在同一个页面上发布表单。

当我尝试像以前那样输入验证码时，但是在同一页面上发布代码，这会导致整个页面在加载时变为空白。

错误报告:

注意:未定义索引:在/_assets/commentBox/podcastHeader.php第36行

注意:未定义索引:在/_assets/commentBox/podcastHeader.php第37行

验证码输入不正确。回去再试一次。(验证码显示:incorrect-captcha-sol)

所以我猜它试图立即找到reCaptcha表单，但失败了，因为还没有填写任何内容。

这是我使用的相关代码:

<?php
require_once('../../_assets/recaptchalib.php');
$privatekey = "xxxxxx ";
$resp = recaptcha_check_answer ($privatekey,
                            $_SERVER["REMOTE_ADDR"],
                            $_POST["recaptcha_challenge_field"],
                            $_POST["recaptcha_response_field"]);
if (!$resp->is_valid) {
// What happens when the CAPTCHA was entered incorrectly
die ("The reCAPTCHA wasn't entered correctly. Go back and try it again." .
     "(reCAPTCHA said: " . $resp->error . ")");
} else {
// Your code here to handle a successful verification
if (isset($_POST['submit'])) {
$required_fields = array("author", "body");
validate_presences($required_fields);
if (empty($errors)) {
    $author = mysql_prep($_POST['author']);
    $body = mysql_prep($_POST['body']); 
    $page_name = ($_POST['page_name']);
    $current_time = date("Y-m-d H-i-s");
    
    $query  = "INSERT INTO comments (";
    $query .= "  author, body, page_name, created";
    $query .= ") VALUES (";
    $query .= "  '{$author}', '{$body}', '{$page_name}', '{$current_time}'";
    $query .= ")";
    $result = mysqli_query($connection, $query);
    
    if ($result) {
        redirect_to("{$url}{$anchor}");
    } else {
            // Failure
            $_SESSION["message"] = "There was an error that prevented the comment from being saved.";
    }
}
} else {
    $author = "";
    $body = "";
}
}
$display_comments = find_comments();
?>

这是注释表单:

<div id="newComment">
    <h3 id="leaveComment">Leave a Comment!</h3>
    <?php echo message();  ?>
    <?php echo form_errors($errors); ?>
    <form action="<?php echo $url; ?>#comments" method="post">
    <input type="hidden" name="page_name" value="<?=$_SERVER['REQUEST_URI']?>" />
    <input type="text" name="author" placeholder="Nickname" value="<?php echo $author; ?>" /><br>
    <textarea name="body" style="margin-top:5px" cols="40" rows="8" placeholder="What's on your mind?"><?php echo $body; ?></textarea><br>
    
    <div style="margin-top: 6px">
        <?php
            require_once('../../_assets/recaptchalib.php');
            $publickey = "xxxxxx";
            echo recaptcha_get_html($publickey);
        ?>
    </span>
    <input type="submit" style="margin-top:10px" name="submit" value="Submit" />
        <span style="margin-left: 8px">
        <a href="#title">Return to top</a>
        </div>
</form>
 </div>

if (isset($_POST['submit'])) {
    $resp = recaptcha_check_answer(...);
    if (!$resp->is_valid) {
        // Wrong captcha
    }
}