php - Yii unserialize and diff -

i have problem, trivial can not deal because snap out of still gets there error type: unserialize (): error @ offset 0 of 31 bytes

controller:

public function actionhistory($id) {     $post=mymodel::model()->findall('id='.$id);         if($post == null){         $error = yii::app()->errorhandler->error;         if ($error)             $this->render('error', array('error'=>$error));         else             throw new chttpexception(404, 'page not found.');     }       $dataprovider=new cactivedataprovider('mymodel',array(         'criteria'=>array(             'condition'=>'id='.$id,             'order'=>'id desc',         )     ));       $this->render('history',array(         'dataprovider'=>$dataprovider,         'id'=>$id,      )); } 

and view file:

<div class="view" style="float: left; width:100%;">      <b><?php echo chtml::encode($data->getattributelabel('id')); ?>:</b>     <?php echo chtml::link(chtml::encode($data->id), array('view', 'id'=>$data->id)); ?>     <br />     <div id="old" style="width: 48%; margin: 1%; float: left; ">          <b><?php echo chtml::encode($data->getattributelabel('old')); ?>:</b>         <div id="old" style="float: left; width:100%; background-color:rgba(248, 200, 178, 0.3)">          <?php          echo chtml::encode($data->old);         ?>             </div>         <br />     </div>     <div id="diff" style="width: 48%; margin: 1%; float: left; ">          <b><?php echo chtml::encode($data->getattributelabel('diff')); ?>:</b>         <div id="diff" style="float: left; width:100%; background-color: rgba(210, 249, 244, 0.45);">              <?php echo chtml::encode($data->diff); ?>         </div>         <br />     </div>  </div> 

now, $data->diff , $data->old added database serialize, , needs use unserialize display data when tries error unserialize (): error @ offset 0 of 31 bytes or similar.

can me somehow? :)

first of change code here

 $post=mymodel::model()->findall(array("condition"=>"id = $id")); 

or can choose

$post=mymodel::model()->findbypk($id); 

do if id primary key in database table otherwise go first one.

then correct value.