checkbox handling in yii framework -

i try make checkboxes in yii framework foreach , code write

 <?php  foreach ($similaredu $value)     {          $checkboxname = $value['checkboxname'];          $checkboxid   = $value['checkboxid'];          ?>                   <?php echo $form->labelex($model,$checkboxname); ?>                 <?php echo $form->checkbox($model,'check[]', array('value'=>$checkboxid)); ?>                 <?php echo $form->error($model,'check'); ?>          <?php   }   ?> 

for particular case checked checkboxes , try value of them , getting :

array (     [similarform] => array     (         [check] => array             (                 [0] => 0                 [1] => 20800                 [2] => 0                 [3] => 20801                 [4] => 0                 [5] => 20803                 [6] => 0                 [7] => 20804                 [8] => 0                 [9] => 20805             )      )     [yt1] => submit 

)

i dont know why showing me 0 after every specified value in array . please help.