You invoke the utility whenever you need input from the user, and then return to your script to continue processing whatever data was provided.

当您需要来自用户的输入时调用该实用程序，然后返回到您的脚本继续处理提供的任何数据。

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When you are finished with the tutorial, you will have a search page that can take input from users, compare it against the data in a database, and return results to the user.

当您完成本文的学习后，您将会创建一个搜索页面，该页面能够接受用户的输入，并与数据库中的数据相比较，然后向用户返回查询的结果。

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This lets you immediately return a page to the user, even though the results of the data processing may not be known.

这样就可以立即把一个页面返回给用户，尽管数据处理的结果还是未知的。

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