[Wiki] Yii Change Password with use of old and repeat password using bootstrap TbActiveForm

//Define public variable
 
    public $old_password;
    public $new_password;
    public $repeat_password;
 
 
    //Define the rules for old_password, new_password and repeat_password with changePwd Scenario.
 
    public function rules()
    {
      return array(
        array('old_password, new_password, repeat_password', 'required', 'on' => 'changePwd'),
        array('old_password', 'findPasswords', 'on' => 'changePwd'),
        array('repeat_password', 'compare', 'compareAttribute'=>'new_password', 'on'=>'changePwd'),
      );
    }
 
 
    //matching the old password with your existing password.
    public function findPasswords($attribute, $params)
    {
        $user = User::model()->findByPk(Yii::app()->user->id);
        if ($user->password != md5($this->old_password))
            $this->addError($attribute, 'Old password is incorrect.');
    }

public function actionChangepassword($id)
 {      
    $model = new User;
 
    $model = User::model()->findByAttributes(array('id'=>$id));
    $model->setScenario('changePwd');
 
 
     if(isset($_POST['User'])){
 
        $model->attributes = $_POST['User'];
        $valid = $model->validate();
 
        if($valid){
 
          $model->password = md5($model->new_password);
 
          if($model->save())
             $this->redirect(array('changepassword','msg'=>'successfully changed password'));
          else
             $this->redirect(array('changepassword','msg'=>'password not changed'));
            }
        }
 
    $this->render('changepassword',array('model'=>$model)); 
 }

<div class="form">
 
<?php $form = $this->beginWidget('bootstrap.widgets.TbActiveForm', array(
            'id' => 'chnage-password-form',
            'enableClientValidation' => true,
            'htmlOptions' => array('class' => 'well'),
            'clientOptions' => array(
                'validateOnSubmit' => true,
            ),
     ));
?>
 
  <div class="row"> <?php echo $form->labelEx($model,'old_password'); ?> <?php echo $form->passwordField($model,'old_password'); ?> <?php echo $form->error($model,'old_password'); ?> </div>
 
  <div class="row"> <?php echo $form->labelEx($model,'new_password'); ?> <?php echo $form->passwordField($model,'new_password'); ?> <?php echo $form->error($model,'new_password'); ?> </div>
 
  <div class="row"> <?php echo $form->labelEx($model,'repeat_password'); ?> <?php echo $form->passwordField($model,'repeat_password'); ?> <?php echo $form->error($model,'repeat_password'); ?> </div>
 
  <div class="row submit">
    <?php $this->widget('bootstrap.widgets.TbButton', array('buttonType' => 'submit', 'type' => 'primary', 'label' => 'Change password')); ?>
  </div>
  <?php $this->endWidget(); ?>
</div>