什么情况下会调用__unset方法呢2.
魔术方法是对不存在的属性进行操作的，那又怎么执行unset（$this->arr[$name]）的呢
没有出现乱码就好啦
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1、需要注销，清空对象时使用unset方法时 会调用__unset重构 方法
2、