Marko Bischof

// protected/models/UploadForm.php
class UploadForm extends CFormModel {
    public $image;
 
    public function rules() {
        return array(
            array('image', 'file', 'types' => 'jpg, gif, png'),
        );
    }
}

// protected/controllers/SiteController.php
public function actionUpload() {
    $form = new UploadForm;
    if (isset($_POST['UploadForm'])) {
        if ($form->validate()) {
            $form->image = CUploadedFile::getInstance($form, 'image');
            $file= dirname(Yii::app()->request->scriptFile) . DIRECTORY_SEPARATOR . $form->image->name;
            $form->image->saveAs($file);
        }
    }
    $this->render('upload', array('form'=>$form));
}

<!--protected/views/site/upload.php-->
<div class="yiiForm">
<?php echo CHtml::form('', 'post', array('enctype'=>'multipart/form-data')); ?>
 
<?php echo CHtml::errorSummary($form); ?>
 
<div class="simple">
<?php echo CHtml::activeLabel($form,'image'); ?>
<?php echo CHtml::activeFileField($form, 'image'); ?>
<br/>
<?php echo CHtml::submitButton('Upload'); ?>
</div>
 
<?php echo CHtml::endForm(); ?>
 
</div>