今天遇到在用CI框架上传csv文件时报错问题：
The filetype you are attempting to upload is not allowed.
是类型不允许，想到CI框架的config/mimes.php的配置，发现已经有csv的mimes配置，而且在win7下是可以上传的
于是百度之，半天没结果，果然换google，找到如下的记录：
The answer to my problem was with MIME types—I’ll leave this comment up here in case it is related. My CSV was returning with a MIME type of text/plain instead of any of the many acceptable CSV MIME types, so I just added text/plain to the csv entry in application/config/mime.php
于是在config/mimes.php中的csv数组中加入 text/plain，问题解决