默认情况下，函数体中的动作只作用于最终解析。

By default, the actions in a function body are only performed on a final parse.

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除了添加过滤器和动作外，还可以覆盖WordPress内的函数。

In addition to adding filters and actions, you can override functions in WordPress.

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请注意insert和delete动作的at属性内index函数的使用。

Notice the use of the index function within the at attribute of the insert and delete actions.

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