建立文件交换功能的脚本（三）
//do.php执行上载的文件
当你按下了提交按钮后，文件将会从你的计算机上传到服务器的临时目录下。
在临时目录下的文件名为一个临时文件。应该使用file字段的name值来访问它，在这里为$myfile。
真正的文件名使用file字段的name值加上"_name"来访问它，在这里为$myfile_name。
使用copy()函数，将临时文件$myfile拷贝到指定目录下，拷贝后的文件名为$myfile_name。
完成后不要忘了删除临时文件，不然你会有许多你不想要的文件。
另外你对你指定的目录要有读写权限。在这里是/usr/local/apache/htdocs/file/
//3绉
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