实例类图：抽象工厂：LogFactory.php <?php interface LogFactory{public function createLog(); } 抽象产品：Logger.php <?php interface Logger{public function writeLog(); }具体产品：数据库日志记录器 DatabaseLog.php <?php require_once "Logger.php";class DatabaseLog implements Logger {public function writeLog(){echo "数据库记录日志中...";}} 具体产品：文件日志记录器 FileLog.php <?php require_once "Logger.p...