Foreach In Bootstrap Tbbutton Popover Is Not Work

$mes= Yii::app()->getModule(‘message’)->getUnreadedMessages(Yii::app()->user->getId());



I put foreach($mes as $m){ echo CHtml::encode($m->subject); } at ‘data-content’



         array( /


        'class'=>'bootstrap.widgets.TbButton',


        'encodeLabel'=>false,


      


          'label' =>'title',


          'icon'=>'icon-envelope-alt',


          'type' => 'link',


           'size' => '',


           'visible'=>!Yii::app()->user->isGuest,


           


           'htmlOptions' => array(


           


           'class'=>'pull-right',


          'data-title' => 'title',


          'data-placement' => 'bottom',


          'data-content' =>[b]foreach($mes as $m){ 


                                     echo CHtml::encode($m->subject);


                                      }[/b],


          'data-trigger'=>'click',


          'data-html'=>true,


          'data-toggle' => 'popover'


                                ),


                    ),


I got Parse error: syntax error, unexpected T_FOREACH ,

but the code without top of that widgets works fine. please help~!