本文实例讲述了Yii框架上传图片用法。分享给大家供大家参考，具体如下：
Yii 提供了 CUploadedFile 来上传文件，比如图片，或者文档。
官方关于这个类的介绍 :
CUploadedFile represents the information for an uploaded file.
Call getInstance to retrieve the instance of an uploaded file, and then use saveAs to save it on th
