How to validate an array of uploaded files?

Question

To validate a single file (a single input-file-field) is no problem in Yii and it works very well:

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'
        ),
        ....
        ....

What if image is an array of files? Created Form-Elements by Yii looks like this (Firebug-Output):

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

What exactly should I modify in my rules? A simple "image[]" does not help.

EDIT: Solution

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'
        ),
        ....
        ....

Answer 1

Set the maxFiles attribute appropriately and the validator will work for all of the inputs. You don't need to change the input control names.