如何验证已上传文件的数组

验证单个文件（单个输入文件字段）在 Yii 中没有问题，并且效果很好：

public function rules() {
    return CMap::mergeArray(parent::rules(), array(
        array(
            'image', 
            'file', 
            'allowEmpty'=>false, 
            'types'=>'pdf,jpg,gif,png', 
            'on' => 'CaseA, CaseB', 
            'maxSize'=>1024000, 
            'tooLarge' => 'Max File size is 1MB', 
            'message' => 'You have to upload a file at least'
        ),
        ....
        ....

如果图像是文件数组怎么办？Yii 创建的 Form-Elements 看起来像这样（Firebug-Output）：

<input type="file" id="MyFormModel[image][0]" name="MyFormModel[image][0]">
<input type="file" id="MyFormModel[image][1]" name="MyFormModel[image][1]">

我应该在我的规则中修改什么？一个简单的"图像[]"无济于事。

编辑：解决方案

public function rules() {
    return CMap::mergeArray(parent::rules(), array(
        array(
            'image', 
            'file', 
            'allowEmpty'=>false, 
            'types'=>'pdf,jpg,gif,png', 
            'on' => 'CaseA, CaseB', 
            'maxSize'=>1024000, 
            'maxFiles' => 5, // <----- THAT'S IT
            'tooLarge' => 'Max File size is 1MB', 
            'message' => 'You have to upload a file at least'
        ),
        ....
        ....