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unregisterFilter()
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unregisterFilter() — 注销过滤器

void unregisterFilter(string type,
                      string|array callback);

注销过滤器。参数如下：

type defines the type of the filter. Valid values are "pre", "post", "output" and "variable".
callback defines the PHP callback. it can be either:
- A string containing the function name
- An array of the form array(&$object, $method) with &$object being a reference to an object and $method being a string containing the method-name
- An array of the form array($class, $method) with $class being the class name and $method being a method of the class.

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