php统计访客防

<?php
// 获取访问者的IP地址
$ip = $_SERVER['REMOTE_ADDR'];

// 获取访问时间
$time = date('Y-m-d H:i:s');

// 获取访问页面
$page = $_SERVER['REQUEST_URI'];

// 将信息存储到数据库
$db = new PDO('mysql:host=localhost;dbname=visitor_db', 'username', 'password');
$sql = "INSERT INTO visitors (ip, time, page) VALUES (:ip, :time, :page)";
$stmt = $db->prepare($sql);
$stmt->bindParam(':ip', $ip);
$stmt->bindParam(':time', $time);
$stmt->bindParam(':page', $page);
$stmt->execute();
?>

<?php
// 获取访问者的IP地址
$ip = $_SERVER['REMOTE_ADDR'];

// 检查IP地址是否在短时间内访问次数过多
$db = new PDO('mysql:host=localhost;dbname=visitor_db', 'username', 'password');
$sql = "SELECT COUNT(*) as count FROM visitors WHERE ip = :ip AND time > NOW() - INTERVAL 1 MINUTE";
$stmt = $db->prepare($sql);
$stmt->bindParam(':ip', $ip);
$stmt->execute();
$result = $stmt->fetch(PDO::FETCH_ASSOC);

if ($result['count'] > 10) {
    // 访问次数过多，拒绝访问
    die("Too many requests from this IP.");
} else {
    // 正常处理访问请求
    // ...
}
?>