发现一有趣儿的东东
检查文件是否存在（这个函数很有趣）
bool file_exists ( string filename )
如果由 filename 指定的文件或目录存在则返回 TRUE，否则返回 FALSE。
这个函数很趣，在WIN上，如果你把文件设置为了没有文件名的文件（即像：.httpaccess之类的文件）或者隐藏了某个文件，它就对该文件不“感兴趣” 了，file_exists会认为这个文件不存在（它是文件确实有的），我想这也是出于安全的原因吧。PHP官网BBS上也谈论过个话题，有些人认为是一个BUG。但是这个函数的兄弟file_size就不一样了，如果你在用它来递归求某个文件夹大小时，会把你这个文件夹下的所有文件都计算在内（包括隐藏文件）。所你可以用file_exists函数来屏蔽这个现象!
------解决方案--------------------
哦！！
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