答案：在Yii中處理文件上傳需設(shè)置表單enctype為multipart/form-data，使用UploadedFile類獲取文件，通過模型驗證規(guī)則校驗文件類型，並在控制器中保存文件。確保上傳目錄可寫並重命名文件以保障安全。

Handling file uploads in Yii, especially Yii2, is straightforward when using model-based validation and proper form configuration. The key is to use CUploadedFile in Yii 1.1 or yii\web\UploadedFile in Yii2, along with model rules and correct HTML form encoding.

Set the Correct Form Encoding

When creating a form for file uploads, you must set the enctype to multipart/form-data . In Yii, when using ActiveForm , this is done by adding the options parameter:

• In Yii2:
$form = ActiveForm::begin(['options' => ['enctype' => 'multipart/form-data']]);
• In Yii 1.1:
$form = $this->beginWidget('CActiveForm', array( 'htmlOptions' => array('enctype' => 'multipart/form-data'), ));

Configure the Model

Create a model (either a dedicated one or your ActiveRecord model) with a file attribute and validation rules.

• In Yii2:
class UploadForm extends \yii\base\Model
{
public $imageFile;

public function rules()
{
return [
[['imageFile'], 'file', 'skipOnEmpty' => false, 'extensions' => 'png, jpg, jpeg, gif'],
];
}
}
• In Yii 1.1:
array('imageFile', 'file', 'types'=>'jpg, png, gif', 'allowEmpty'=>false),

Process the Upload in the Controller

In your controller action, instantiate the model, retrieve the uploaded file, validate, and save.

• Yii2 example:
if ($model->load(Yii::$app->request->post())) {
$model->imageFile = UploadedFile::getInstance($model, 'imageFile');
if ($model->validate()) {
$fileName = 'upload_' . time() . '.' . $model->imageFile->extension;
$model->imageFile->saveAs('uploads/' . $fileName);
// Optionally save $fileName to database
Yii::$app->session->setFlash('success', 'File uploaded successfully.');
}
}
• Yii 1.1 example:
$model->imageFile = CUploadedFile::getInstance($model, 'imageFile');
if ($model->validate()) {
$model->imageFile->saveAs('/path/to/uploads/' . $model->imageFile->getName());
}

Use in View

In your view, use ActiveForm and a file input field:

Make sure the upload directory is writable and consider security: validate file types, rename files, and avoid executing uploaded files.

Basically, it's about form encoding, model validation, and handling the uploaded instance correctly. With these steps, file uploads work reliably in Yii.

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