Php Yii文件上传给控制器中的空数组

您好，请检查我的以下代码：

型号：

 public $image;
/**
 * @return string the associated database table name
 */
public function tableName()
{
    return 'file';
}

/**
 * @return array validation rules for model attributes.
 */
public function rules()
{
    // NOTE: you should only define rules for those attributes that
    // will receive user inputs.
    return array(
        array('image_url', 'required'),
        array('image_url', 'length', 'max'=>256),
        // The following rule is used by search().
        // @todo Please remove those attributes that should not be searched.
        array('image_url', 'safe', 'on'=>'search'),
         array('image', 'file', 'types'=>'jpg, gif, png'),
    );
}

public function actionCreate()
{
    $model=new File;
            print_r($_POST['File']);
             $this->render('create',array(
        'model'=>$model,
    ));
}

<?php
 $form = $this->beginWidget(
'CActiveForm',
array(
    'id' => 'upload-form',
    'enableAjaxValidation' => false,
    'htmlOptions' => array('enctype' => 'multipart/form-data'),
)
);

   echo $form->labelEx($model, 'image');
   echo $form->fileField($model, 'image');
   echo $form->error($model, 'image');
   echo CHtml::submitButton('Submit'); 
   $this->endWidget();?>

控制器：

 public $image;
/**
 * @return string the associated database table name
 */
public function tableName()
{
    return 'file';
}

/**
 * @return array validation rules for model attributes.
 */
public function rules()
{
    // NOTE: you should only define rules for those attributes that
    // will receive user inputs.
    return array(
        array('image_url', 'required'),
        array('image_url', 'length', 'max'=>256),
        // The following rule is used by search().
        // @todo Please remove those attributes that should not be searched.
        array('image_url', 'safe', 'on'=>'search'),
         array('image', 'file', 'types'=>'jpg, gif, png'),
    );
}

public function actionCreate()
{
    $model=new File;
            print_r($_POST['File']);
             $this->render('create',array(
        'model'=>$model,
    ));
}

<?php
 $form = $this->beginWidget(
'CActiveForm',
array(
    'id' => 'upload-form',
    'enableAjaxValidation' => false,
    'htmlOptions' => array('enctype' => 'multipart/form-data'),
)
);

   echo $form->labelEx($model, 'image');
   echo $form->fileField($model, 'image');
   echo $form->error($model, 'image');
   echo CHtml::submitButton('Submit'); 
   $this->endWidget();?>

查看：

 public $image;
/**
 * @return string the associated database table name
 */
public function tableName()
{
    return 'file';
}

/**
 * @return array validation rules for model attributes.
 */
public function rules()
{
    // NOTE: you should only define rules for those attributes that
    // will receive user inputs.
    return array(
        array('image_url', 'required'),
        array('image_url', 'length', 'max'=>256),
        // The following rule is used by search().
        // @todo Please remove those attributes that should not be searched.
        array('image_url', 'safe', 'on'=>'search'),
         array('image', 'file', 'types'=>'jpg, gif, png'),
    );
}

public function actionCreate()
{
    $model=new File;
            print_r($_POST['File']);
             $this->render('create',array(
        'model'=>$model,
    ));
}

<?php
 $form = $this->beginWidget(
'CActiveForm',
array(
    'id' => 'upload-form',
    'enableAjaxValidation' => false,
    'htmlOptions' => array('enctype' => 'multipart/form-data'),
)
);

   echo $form->labelEx($model, 'image');
   echo $form->fileField($model, 'image');
   echo $form->error($model, 'image');
   echo CHtml::submitButton('Submit'); 
   $this->endWidget();?>