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.');
    }
 
 
 
 
 
 
 
 控制器
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)); 
 }
模板文件 (changepassword.php)
 
   <h2>修改密码</h2>
 
          <div class="form" style="margin-left:50px;margin-top:20px;">
 
              <?php $form=$this->beginWidget('CActiveForm', array(
                  'id'=>'account-form',
                  'enableClientValidation'=>true,
                  'enableAjaxValidation'=>false,
              )); ?>
 
 
              <?php //echo $form->errorSummary($model); ?>
 
              <div class="row">
                  <?php echo $form->labelEx($model,'old_password'); ?>
                  <?php echo $form->passwordField($model,'old_password',array('size'=>60,'maxlength'=>128,'class'=>'pwd_pro_input')); ?>
                  <?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',array('size'=>60,'maxlength'=>128,'class'=>'pwd_pro_input')); ?>
                  <?php echo $form->error($model,'new_password'); ?>
              </div>
 
              <div class="row">
                  <?php echo $form->labelEx($model,'new_password'); ?>
                  <?php echo $form->passwordField($model,'repeat_password',array('size'=>60,'maxlength'=>128,'class'=>'pwd_pro_input')); ?>
                  <?php echo $form->error($model,'repeat_password'); ?>
              </div>
 
              <div class="row buttons">
                  <?php echo CHtml::submitButton('修改密码',array('class'=>'btn_reset')); ?>
              </div>
 
              <?php $this->endWidget(); ?>