本文實例講述了Yii框架上傳圖片用法。分享給大家供大家參考，具體如下：
Yii 提供了 CUploadedFile 來上傳文件，比如圖片，或者文檔。
官方關于這個類的介紹 :
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 the server. You may also query other information about the file, including name, tempName, type, size and error.
public properties
| Property | Type | Description | Defined By |
|---|---|---|---|
| error | integer | Returns an error code describing the status of this file uploading. | CUploadedFile |
| extensionName | string | the file extension name for name. | CUploadedFile |
| hasError | boolean | whether there is an error with the uploaded file. | CUploadedFile |
| name | string | the original name of the file being uploaded | CUploadedFile |
| size | integer | the actual size of the uploaded file in bytes | CUploadedFile |
| tempName | string | the path of the uploaded file on the server. | CUploadedFile |
| type | string | the MIME-type of the uploaded file (such as "image/gif"). | CUploadedFile |
1、 模型層面 M ，把一個字段在rules方法里設置為 file 屬性。
array('url', 'file', //定義為file類型 'allowEmpty'=>true, 'types'=>'jpg,png,gif,doc,docx,pdf,xls,xlsx,zip,rar,ppt,pptx', //上傳文件的類型 'maxSize'=>1024*1024*10, //上傳大小限制，注意不是php.ini中的上傳文件大小 'tooLarge'=>'文件大于10M，上傳失?。≌埳蟼餍∮?0M的文件！'), 2、視圖層View，這里需要用到CHtml::activeFileField 來生成選擇文件的button，注意是上傳文件，所以在該標單中enctype應該設置為： multupart/form-data
<?php $form=$this->beginWidget('CActiveForm', array(<span style="white-space:pre"> </span>'id'=>'link-form',<span style="white-space:pre"> </span>'enableAjaxValidation'=>false,<span style="white-space:pre"> </span>'htmlOptions' => array('enctype'=>'multipart/form-data'),)); ?> <div class="row"> <?php echo $form->labelEx($model,'url'); ?> <?php echo CHtml::activeFileField($model,'url'); ?> <?php echo $form->error($model,'url'); ?></div>
3、控制層 C
$model=new Link;if(isset($_POST['Link'])){ $model->attributes=$_POST['Link']; if(empty($_POST['Link']['name'])){ $model->name = $model->url; } $file = CUploadedFile::getInstance($model,'url'); //獲得一個CUploadedFile的實例 if(is_object($file)&&get_class($file) === 'CUploadedFile'){ // 判斷實例化是否成功 $model->url = './assets/upfile/file_'.time().'_'.rand(0,9999).'.'.$file->extensionName; //定義文件保存的名稱 }else{ $model->url = './assets/upfile/noPic.jpg'; // 若果失敗則應該是什么圖片 } if($model->save()){ if(is_object($file)&&get_class($file) === 'CUploadedFile'){ $file->saveAs($model->url); // 上傳圖片 } $this->redirect(array('view','id'=>$model->lid)); }} 
