在参数的数据类型是由函数原型定义的情况中，参数应该根据标准规则转换成这种类型。

In the case where the data type of the parameter is defined by a function prototype, the parameter is converted to that type according the standard rules.

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该函数可以是标准的PHP函数，在WordPress核心中定义的函数或者你自己在插件文件中定义的函数。

This can be a standard PHP function, a function present in the WordPress core, or a function defined by you in the plugin file.

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到目前为止，要想使用定制的比较函数，标准的做法是定义自己的函数对象，然后适当地定义操作符。

So far, to use custom comparison functions, the standard practice has been to define your own function object and then define the operator appropriately.

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