如何通过学习PHP原生开发构建高可用和可靠的系统架构

class User {
    private $name;
    private $email;

    public function __construct($name, $email) {
        $this->name = $name;
        $this->email = $email;
    }

    public function getName() {
        return $this->name;
    }

    public function getEmail() {
        return $this->email;
    }
}

$user = new User("John Doe", "john@example.com");
echo $user->getName(); // 输出 "John Doe"
echo $user->getEmail(); // 输出 "john@example.com"

class Database {
    private static $instance = null;

    private function __construct() {
        // 连接数据库
    }

    public static function getInstance() {
        if (self::$instance == null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function query($sql) {
        // 执行SQL查询
    }

    // 其他数据库操作方法
}

$db = Database::getInstance();
$db->query("SELECT * FROM users");

$memcached = new Memcached();
$memcached->addServer("localhost", 11211);

$key = "user:1";
$user = $memcached->get($key);

if (!$user) {
    // 从数据库中获取用户信息
    $user = getUserFromDatabase(1);

    // 将用户信息存入缓存
    $memcached->set($key, $user, 3600);
}

// 使用用户信息
echo $user->getName();

use MonologLogger;
use MonologHandlerStreamHandler;

// 创建日志记录器
$log = new Logger('system');
$log->pushHandler(new StreamHandler('path/to/logfile.log', Logger::WARNING));

// 记录日志
$log->warning('This is a warning message.');

// 捕获异常并记录错误信息
try {
    // 代码逻辑
} catch (Exception $e) {
    $log->error($e->getMessage());
}