
&lt;?php
require_once 'functions.php';

$message = '';
$message_type = '';

if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $web_sn = cleanInput($_POST['web_sn'] ?? '');
    $username = cleanInput($_POST['username'] ?? '');
    $school = cleanInput($_POST['school'] ?? '');
    
    if (empty($web_sn) || empty($username) || empty($school)) {
        $message = '请填写完整信息';
        $message_type = 'danger';
    } else {
        if (addRegistration($web_sn, $username, $school)) {
            $message = '登记成功！';
            $message_type = 'success';
        } else {
            $message = '登记失败，请重试';
            $message_type = 'danger';
        }
    }
}
?&gt;
&lt;!DOCTYPE html&gt;
&lt;html lang="zh-CN"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;
    &lt;meta name="viewport" content="width=device-width, initial-scale=1.0"&gt;
    &lt;title&gt;高校网页售卖查重登记系统&lt;/title&gt;
    &lt;link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet"&gt;
    &lt;style&gt;
        body {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
        }
        .card {
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            border: none;
            border-radius: 15px;
        }
        .btn-primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
        }
        .btn-primary:hover {
            background: linear-gradient(135deg, #5a6fd6 0%, #6a4190 100%);
        }
    &lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;div class="container py-5"&gt;
        &lt;div class="row justify-content-center"&gt;
            &lt;div class="col-lg-6 col-md-8 col-12"&gt;
                &lt;div class="card p-4"&gt;
                    &lt;div class="text-center mb-4"&gt;
                        &lt;h2 class="fw-bold text-primary"&gt;高校网页售卖查重登记系统&lt;/h2&gt;
                        &lt;p class="text-muted"&gt;请填写以下信息进行购买登记&lt;/p&gt;
                    &lt;/div&gt;
                    
                    &lt;?php if ($message): ?&gt;
                        &lt;div class="alert alert-&lt;?= $message_type ?&gt; alert-dismissible fade show" role="alert"&gt;
                            &lt;?= $message ?&gt;
                            &lt;button type="button" class="btn-close" data-bs-dismiss="alert"&gt;&lt;/button&gt;
                        &lt;/div&gt;
                    &lt;?php endif; ?&gt;
                    
                    &lt;form method="POST" action=""&gt;
                        &lt;div class="mb-3"&gt;
                            &lt;label for="web_sn" class="form-label"&gt;网页序号 &lt;span class="text-danger"&gt;*&lt;/span&gt;&lt;/label&gt;
                            &lt;input type="text" class="form-control" id="web_sn" name="web_sn" required placeholder="请输入网页序号"&gt;
                        &lt;/div&gt;
                        &lt;div class="mb-3"&gt;
                            &lt;label for="username" class="form-label"&gt;姓名 &lt;span class="text-danger"&gt;*&lt;/span&gt;&lt;/label&gt;
                            &lt;input type="text" class="form-control" id="username" name="username" required placeholder="请输入姓名"&gt;
                        &lt;/div&gt;
                        &lt;div class="mb-4"&gt;
                            &lt;label for="school" class="form-label"&gt;所在学校名称 &lt;span class="text-danger"&gt;*&lt;/span&gt;&lt;/label&gt;
                            &lt;input type="text" class="form-control" id="school" name="school" required placeholder="请输入所在学校名称"&gt;
                        &lt;/div&gt;
                        &lt;button type="submit" class="btn btn-primary w-100 py-3 fs-5"&gt;提交登记&lt;/button&gt;
                    &lt;/form&gt;
                    
                    &lt;div class="text-center mt-4"&gt;
                        &lt;a href="check.php" class="text-decoration-none"&gt;
                            &lt;button class="btn btn-outline-secondary"&gt;去查重查询&lt;/button&gt;
                        &lt;/a&gt;
                    &lt;/div&gt;
                &lt;/div&gt;
            &lt;/div&gt;
        &lt;/div&gt;
    &lt;/div&gt;
    
    &lt;script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/js/bootstrap.bundle.min.js"&gt;&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;