它提供了轻松输出XML的能力，还有与数据库、目录服务器、身份验证存储和会话的交互。
It provides the ability to easily output XML, as well as interact with databases, directory servers, authentication stores, and sessions.
默认情况下，php中的会话信息将被写入临时目录。
By default, session information in PHP is written to a temporary directory.
每个目录下都会生成包含有会话中工作对象二进制序列的隐藏文件。
Hidden files that contain binary serializations of working objects in a session are generated in each directory.
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