The input filtering extensions provide a set of functions to parse and check input before you use it in your functions.

输入过滤扩展功能提供了一组函数来解析和检查输入，然后在函数中使用此输入。

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If your script is operating on input data from users or a data input file, always thoroughly filter, check, and validate the input data.

如果脚本操作来自用户或数据输入文件的输入数据，那么一定要全面筛选、检查和检验输入数据。

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Then check whether any error occurred on the input stream and, if so, give a message.

然后检查输入流上是否发生错误，若是，则给出消息。

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They can also be used for different functions as users can watch a video on one screen and input commands on the other, or check email on one screen and use the other as a soft keyboard.

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