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php有函数作用域，没有块作用域，函数运算结束会销毁变量，当进行其他运算变量是不会销毁的，当程序做得足够大的时候，可能会重复使用变量名，导致程序出错！避免方法：每次使用变量前都初始化！刚接触 ...
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