如果缓存不包含用户详细信息，则返回null。

If the cache does not contain user details, it returns null.

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APF将用户详细信息保存在图2所示由步骤3创建的安全上下文中。

APF saves the user details in the security context created in Step 3 of Figure 2.

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很明显，要运行软件需要用到PHP，且数据库存储内容和用户详细信息。

Obviously, PHP is required to run the software, and the database stores the content and user details.

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