将代码重新优化并且帮我写匹配的sql数据库htmlhead title访问记录titleheadbodyphpuse MonologLogger;use MonologHandlerStreamHandler;验证IP地址的有效性function validate_ip$ip iffilter_var$ip FILTER_VALIDATE_IP return true; else

优化后的代码：

'SET NAMES utf8', ); try{ $pdo = new PDO($dsn, $username, $password, $options); $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); $stmt = $pdo->prepare("INSERT INTO visitor_record (ip_address, browser_info, visit_time, visit_url) VALUES (?, ?, ?, ?)"); $stmt->execute([$ip, $browser, $time, $url]); //使用Monolog来记录日志 $log = new Logger('access'); $log->pushHandler(new StreamHandler('access.log', Logger::INFO)); $log->info('Visitor Info', array('ip' => $ip, 'browser' => $browser, 'time' => $time, 'url' => $url)); echo "记录成功"; } catch(PDOException $e){ echo "记录失败：" . $e->getMessage(); } } else { echo "IP地址无效"; } } //使用缓存技术来统计访问量 $cache = new Memcached(); $cache->addServer('localhost', 11211); if(!$visit_count = $cache->get('visit_count')){ $conn = new mysqli('localhost', 'username', 'password', 'dbname'); if($conn->connect_error){ die("数据库连接失败：" . $conn->connect_error); } $sql = "SELECT COUNT(*) FROM visitor_record"; $result = $conn->query($sql); if($result){ $row = $result->fetch_row(); $visit_count = $row[0]; $cache->set('visit_count', $visit_count, 3600); //设置缓存时间为1小时 } else { echo "查询失败：" . $conn->error; } $conn->close(); } echo "访问量：" . $visit_count; ?>

匹配的SQL数据库：

CREATE TABLE visitor_record ( id INT(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY, ip_address VARCHAR(32) NOT NULL, browser_info VARCHAR(32) NOT NULL, visit_time DATETIME NOT NULL, visit_url VARCHAR(255) NOT NULL );

CREATE INDEX idx_ip_address ON visitor_record (ip_address); CREATE INDEX idx_browser_info ON visitor_record (browser_info); CREATE INDEX idx_visit_time ON visitor_record (visit_time); CREATE INDEX idx_visit_url ON visitor_record (visit_url);