PHP 디자인 패턴: 올바른 패턴을 선택하는 방법

// 接口
interface DatabaseConnection {
    public function connect(): void;
}

// 具体类
class MySQLDatabaseConnection implements DatabaseConnection {
    public function connect(): void {}
}

// 业务逻辑
class User {
    private DatabaseConnection $database;
    public function __construct(DatabaseConnection $database) {
        $this->database = $database;
    }
    public function save(): void {
        $this->database->connect();
        // 执行数据库操作
    }
}

// 接口
interface ExceptionHandler {
    public function handle(Exception $e): void;
}

// 具体类
class LogExceptionHandler implements ExceptionHandler {
    public function handle(Exception $e): void {
        // 记录异常
    }
}

class EmailExceptionHandler implements ExceptionHandler {
    public function handle(Exception $e): void {
        // 发送异常电子邮件
    }
}

// 使用策略
class ExceptionManager {
    private ExceptionHandler $handler;
    public function __construct(ExceptionHandler $handler) {
        $this->handler = $handler;
    }
    public function handleException(Exception $e): void {
        $this->handler->handle($e);
    }
}