Array Value For Cactiveform Hidden Field

<?php $form=$this->beginWidget('CActiveForm', array(
	'id'=>'advertisement-form',
	'enableAjaxValidation'=>false,
	'enableClientValidation'=>true,
	'method'=>'post',
	'clientOptions' => array(
          'validateOnsubmit'=>true,
	     		
              ),
)); ?>

<?php echo $form->hiddenField($model,'MyArray'); ?> 

<?php $this->endWidget(); ?>