PHP路由致表单提交空白页、邮件发送失败问题求助

问题现象 #

• 表单提交后跳转至thank-you.php，但页面空白（开发者工具显示body无HTML内容），邮件无法送达目标邮箱
• 在thank-you.php中执行var_dump($_POST)无输出
• 路由测试时，其他子页面仅打印到对应路由位置的数字，而thank-you.php会打印所有路由前的数字（包括后续路由的数字）

相关代码 #

HTML表单代码 #

<form class="contact-form" method="POST" action="/thank-you">
    <input type="text" id="website" name="website" />

    <div class="contact-wrapper name">
        <label for="name">
            <?php echo $lang["contact-name"] ?>
        </label>
        <input type="text" id="name" name="name" placeholder="<?php echo $lang['name-placeholder'] ?>" required>
    </div>
    <div class="contact-wrapper email-and-phone">
        <div>
            <label for="email">E-mail</label>
            <input type="text" id="email" name="email" placeholder="<?php echo $lang['email-placeholder'] ?>" required>
        </div>

        <div>
            <label for="telephone">
                <?php echo $lang["contact-telephone"] ?>
            </label>
            <input type="text" id="telephone" name="telephone" placeholder="<?php echo $lang['telephone-placeholder'] ?>">
        </div>
    </div>
    <div class="contact-wrapper subject">
        <label for="subject">
            <?php echo $lang["contact-subject"] ?>
        </label>
        <input type="text" id="subject" name="subject" placeholder="<?php echo $lang['subject-placeholder'] ?>" required>
    </div>

    <div class="contact-wrapper message">
        <label for="message">
            <?php echo $lang["contact-message"] ?>
        </label>
        <textarea id="message" name="message" placeholder="<?php echo $lang['message-placeholder'] ?>" style="height:200px" required></textarea>
    </div>
    <input type="submit" id="submit" name="submit" value="<?php echo $lang['contact-submit'] ?>">
</form>

thank-you.php代码 #

<?php

// exit if accessed directly.
defined('ABSPATH') || die(header('location: /home'));

if (isset($_POST['submit']) && $_POST['submit'] != '' && $_POST['submit'] != null) {

    $name = $_POST['name'];
    $mailFrom = $_POST['email'];
    $telephone = $_POST['telephone'];
    $subject = $_POST['subject'];
    $message = $_POST['message'];

    $mailTo = "myemailaddress@gmail.com";
    $txt = "You have received an e-mail from " . $name . ".

" . "E-mail: " . $mailFrom . ".

" . "Telephone: " . $telephone . ".

" . $message;

    mail($mailTo, $subject, $txt);
}
?>

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset='UTF-8' />
    <title>Thank you!</title>
    <link rel="stylesheet" type="text/css" href="css/style.css">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>

<body>
    <div class="thank-you-wrapper">
        <p>Thank you for reaching out to us. We will get back to you shortly. Please click <a href="/home" style="text-decoration: none; color: #0986d9;">here </a> if you are not redirected within a few seconds.
</p>
    </div>
    <script>
        setTimeout(function() {
            window.location.replace("/home"); // will redirect to main page
        }, 3000); // will call the function after 3 secs.
    </script>
</body>

</html>

路由代码 #

<?php

require_once __DIR__ . '/router.php';

// Static GET
// In the URL -> http://localhost

print '1';
// The output -> Index
get('/', 'pages/index.php');

print '2';
// The output -> Thank You
get('/thank-you', 'pages/thank-you.php');

print '3';
// The output -> About
get('/about', 'pages/about.php');

print '4';
// The output -> Services
get('/services', 'pages/services.php');

print '5';
// The output -> Web
get('/web', 'pages/web.php');

print '6';
// The output -> Contact
get('/contact', 'pages/contact.php');

问题原因分析 #

1. 路由未处理POST请求：表单使用POST方法提交到/thank-you，但路由中仅定义了get('/thank-you', ...)，导致POST请求无法匹配对应路由，脚本会继续执行后续所有print语句和路由定义，最终未正确加载thank-you.php，这是thank-you.php会打印所有数字的核心原因。
2. ABSPATH判断中断页面输出：thank-you.php开头的defined('ABSPATH') || die(...)，在路由环境下如果ABSPATH未定义，会直接执行die跳转，中断页面HTML内容的输出，导致页面空白。
3. 路由匹配后未终止脚本：若router.php中的get方法在匹配到路由后未终止脚本（如未加exit/die），后续代码仍会运行，但其他页面是GET请求能匹配路由，而/thank-you的POST请求匹配不到，因此出现差异。

解决方案 #

1. 添加POST路由处理：在路由文件中为/thank-you新增POST路由，确保表单提交的POST请求能被正确匹配：

print '2';
// 保留GET路由用于直接访问，新增POST路由处理表单提交
get('/thank-you', 'pages/thank-you.php');
post('/thank-you', 'pages/thank-you.php');

2. 修复ABSPATH判断逻辑：

   • 方法一：在路由入口文件开头定义ABSPATH：

   define('ABSPATH', __DIR__);
   require_once __DIR__ . '/router.php';
   

   • 方法二：调整thank-you.php中的判断，适配路由环境：

   // 替换原有判断，仅在直接访问该文件时跳转
   if (!defined('ABSPATH') && basename($_SERVER['PHP_SELF']) === basename(__FILE__)) {
       header('location: /home');
       exit;
   }
   

3. 确保路由匹配后终止脚本：检查router.php中的路由处理逻辑，确保在匹配到路由并加载对应页面后，立即执行exit;终止脚本，避免后续代码继续运行。

内容的提问来源于stack exchange，提问作者High T