ThinkPHP3.1版本对分组的支持如了如下改进：
每个分组支持独立的空模块
ThinkPHP3.0及以前版本的分组不支持定义独立的空模块，空模块EmptyAction只能放置在分组目录外层，而ThinkPHP3.1版则改进了每个分组可以定义独立的空模块，对于有不同分组不同空模块需求的情况就方便了。
公共Action和Model类优先加载分组目录
ThinkPHP3.0版本分组如果要继承一个公共的Action类或者Model类分组目录下面的，这个继承的公共类只能放到分组目录外层，否则就要手动用import方法导入，而ThinkPHP3.1开始系统自动加载继承类的时候会优先搜索当前分组目录下面的，如果没有，再去分组外层目录搜索。
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