void load_filter
(string
type, string name)
This function can be used to load a filter plugin. The first
argument specifies the type of the filter to load and can be one of the
following: "pre", "post", or "output". The second argument specifies
the name of the filter plugin, for example, "trim".
这个函数用来加载过滤器插件。第一个参数指定过滤器的类型，只能是下列之一：“pre”，“post”，或者是“output”。第二个参数指定过
滤器插件的名称，比如“trim”。
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Example 13-20. loading filter plugins
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