Use the yii framework to implement file upload and download functions

1. CUploadedFile implements single file upload

(Recommended tutorial: yii framework)

(1) First, in the model The class declares an attribute to store the file name (either form model or active record model). Also declare a file validation rule to ensure that uploaded files have the specified extension.

class Item extends CActiveRecord
{
    public $image;
    // ... other attributes
 
    public function rules()
    {
        return array(
            array('image', 'file', 'types'=>'jpg, gif, png'),
        );
    }
}

(2) Then, define an action method in the controller class to collect the data submitted by the user

class ItemController extends CController
{
    public function actionCreate()
    {
        $model=new Item;
        if(isset($_POST['Item']))
        {
            $model->attributes=$_POST['Item'];
            $model->image=CUploadedFile::getInstance($model,'image');
            if($model->save())
            {
                $model->image->saveAs('path/to/localFile');
                // redirect to success page
            }
        }
        $this->render('create', array('model'=>$model));
    }
}

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(3) Finally, create the action view and generate an uploaded field.

<?php echo CHtml::form(&#39;&#39;,&#39;post&#39;,array(&#39;enctype&#39;=>&#39;multipart/form-data&#39;)); ?>
...
<?php echo CHtml::activeFileField($model, &#39;image&#39;); ?>
...
<?php echo CHtml::endForm(); ?>

2. CUploadedFile implements multiple file uploads

Method: view view code:

for($i=0;$i<3;$i++){
    //echo $form->fileField($model,&#39;xiangguan_tupian[]&#39;).&#39;<br/>&#39;;//这种方法不行
    //echo CHtml::activeFileField($model,&#39;xiangguan_tupian[]&#39;);//这种也不行
    //echo CHtml::fileField(&#39;xiangguan_tupian[]&#39;,&#39;&#39;,array(&#39;id&#39;=>&#39;xiangguan_tupian&#39;.$i)).&#39;&nbsp&#39;;//这种也不行
    echo CHtml::activeFileField($model,&#39;xiangguan_tupian[]&#39;,array(&#39;id&#39;=>&#39;xiangguan_tupian&#39;.$i));
}
?>

controller controller side:                                                                                                   The upload is processed.

(Learning video recommendation:

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) Key points:

$model=new Info;
// echo &#39;<hr><br>&#39;;
$obj_array=CUploadedFIle::getInstances($model,&#39;xiangguan_tupian&#39;);
//注意这里不是getInstance而是getInstances多了个s，这样得到的是一个包含CUploadedFile对象的数组
//print_r($obj_array);
foreach($obj_array as $k=>$v){
    $v->saveAs(Yii::app()->basePath.&#39;/&#39;.$k.&#39;_test.&#39;.$v->getExtensionName());
}

3. Use sendFile() to download files

CUploadedFile::getInstance();    // 返回的是一个CUploadedFile对象，
CUploadeFile::getInstanceByName();   //返回的是一个CUploadedFile对象            
CUploadedFile::getInstances()    //返回的是一个值为CUploadedFile对象的数组
CUploadedFile::getInstancesByName();   //返回的是一个值为CUploadedFile对象的数组

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