The distinction is that often when doing validation, the list or range of possible values is smaller than the list of invalid values, many of which can be unknown or unexpected.

两者之间的区别是，通常在进行验证时，可能值的列表或范围小于无效值的列表或范围，其中许多值可能是未知值或意外值。

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Languages like PHP have a wide range of input validation functions.

php之类的语言有很多输入验证函数。

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Conversion and validation allow you to focus on business logic rather than the tedious qualifications of input data such as null checks, length qualifiers, range boundaries, etc.

转换和验证使您可以侧重于业务逻辑，而不是侧重于对输入数据进行繁琐的资格认定，比如null检验、长度限定、范围边界，等等。

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