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Yii 图片上传，修改，删除

Controller代码：（包括增、改、删）
 
/**
* Creates a new model.
* If creation is successful, the browser will be redirected to the 'view' page.
*/
public function actionCreate()
{
$model=new CompanyNews;
 
 
// Uncomment the following line if AJAX validation is needed
// $this->performAjaxValidation($model);
                
 
 
if(isset($_POST['CompanyNews']))
{
$model->attributes=$_POST['CompanyNews'];
                        if(empty($_POST['CompanyNews']['news_pic'])){
$model->news_pic = $model->news_pic;
}
$file = CUploadedFile::getInstance($model,'news_pic');   //获得一个CUploadedFile的实例
if(is_object($file -->

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