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我有一个带有 recaptcha 的联系表，我正在尝试设置它，但在输入信息并单击提交按钮时会产生 500 错误。我敢打赌我做了一些愚蠢的事情，因为我不是 PHP 方面的佼佼者，所以如果我在这里发布我的代码，任何人都能够发现任何错误吗？

这是联系表本身。

<form class="email" action="mailer.php" method="post">
    <p>Name:</p>
    <input type="text" name="name" />
    <p>E-mail:</p>
    <input type="text" name="email" />
    <p>Subject:</p>
    <input type="text" name="subject" />
    <p>Message:</p>
    <textarea name="message"></textarea></p>
    <script type="text/javascript" src="http://api.recaptcha.net/challenge?k=6Le8_t4SAAAAACIxacT6Xn8NVvDa93loylG-L6mk"></script>
    <noscript>
        <iframe src="http://api.recaptcha.net/noscript?k=PUBLICKEYGOESHERE" height="300" width="500" frameborder="0"></iframe>
        <textarea name="recaptcha_challenge_field" rows="3" cols="40"></textarea>
        <input type="hidden" name="recaptcha_response_field" value="manual_challenge">
    </noscript>
    <input class="send" type="submit" value="Send">
</form>

这是mailer.php

<?php
require_once('recaptchalib.php');
if ($_POST['email'] != '')
{
    $privatekey = "6Le8_t4SAAAAAME8kuqO1bvzcSWmGytwISUYLo3w";
    $resp       = recaptcha_check_answer($privatekey, $_SERVER["REMOTE_ADDR"], $_POST["recaptcha_challenge_field"], $_POST["recaptcha_response_field"]);
    if (!$resp->is_valid)
    {
        die("The reCAPTCHA wasn't entered correctly.
Go back and try it again." . "(reCAPTCHA said: " . $resp->error . ")");
    }
    else
    {
        /* Set e-mail recipient */
        $myemail = "mandy@smarterbookkeeping.com.au";

        /* Check all form inputs using check_input function */
        $name    = check_input($_POST['name'], "Enter your name");
        $subject = check_input($_POST['subject'], "Enter a subject");
        $email   = check_input($_POST['email']);
        $message = check_input($_POST['message'], "Write your message");
        $captcha = check_input($_POST['captcha']);

        /* If e-mail is not valid show error message */
        if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/", $email))
        {
            show_error("E-mail address not valid");
        }

        /* Let's prepare the message for the e-mail */
        $message = "

Name: $name
E-mail: $email
Subject: $subject

Message:
$message

";
        /* Send the message using mail() function */
        mail($myemail, $subject, $message);

        /* Redirect visitor to the thank you page */
        header('Location: thanks.php');
        exit();

        /* Functions we used */
        function check_input($data, $problem = '')
        {
            $data = trim($data);
            $data = stripslashes($data);
            $data = htmlspecialchars($data);
            if ($problem && strlen($data) == 0)
            {
                show_error($problem);
            }
            return $data;
        }
        function show_error($myError)
        {
?>
<html>
<body>

<p>Please correct the following error:</p>
<strong><?php
            echo $myError;
?></strong>
<p>Hit the back button and try again</p>

</body>
</html>
<?php
            exit();
        }
    }
}
?>

我将recaptchalib 放在正确的位置，thanks.php 也是如此。我不是很擅长 PHP，但是这个让我很难过。

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