使用Codeigniter开发文件上传程序时，默认不支持rar和zip压缩包格式，这方面还有待完善。但是我们可以通过自己定义格式来解决这个问题
codeigniter在上传文件时对格式的限制是在application文件夹下config中的mimes.php文件中定义的。该文件默认不包含rar，而且对zip的定义不能上传压缩包。我们在类中，加入以下代码，即可解决这个问题：
复制代码 代码如下:
"zip" => array("application/x-zip", "application/zip" ，"application/x-zip-compressed","application/octet-stream"),//原来只有前三项
"rar" => array("application/octet-stream"),//原来根本就没有rar这一项，整个都是自己加上去的
，
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