这是 CI 2.0 的 Reactor 版本中的一个已知错误这让我整个星期都发疯了.我不确定是否有官方补丁，但您可以在此处找到解决方法:

This is a known bug in the Reactor version of CI 2.0 This was driving me nuts all week. I'm not sure if there has been an official patch yet, but you can find a workaround here:

http://codeigniter.com/forums/viewthread/180078/

更多信息:

https://bitbucket.org/ellislab/codeigniter/issue/332/newlines-in-textareas-are-duplicated