<?php $form=$this->beginWidget('CActiveForm', array( 
  'id'=>'tag-form', 
  'enableAjaxValidation'=>false, 
)); ?> 
  <div class="row"> 
    <?php echo $form->labelEx($model,'tagname'); ?> 
    <?php echo $form->textField($model,'tagname',array('size'=>20,'maxlength'=>32)); ?> 
  </div> 
  <div class="row"> 
    <?php echo $form->labelEx($model,'tagtype'); ?> 
    <?php echo $form->radioButtonList($model,'tagtype'array(1=>"普通TAG"，2=>"系统默认TAG"),array('separator'=>'','labelOptions'=>array('class'=>'tagtypelabel'))); ?> 
  </div> 
  <?php echo $form->errorSummary($model); ?> 
  <div class="row buttons"> 
    <?php echo CHtml::submitButton($model->isNewRecord ? '添加' : '修改'); ?> 
  </div> 
<?php $this->endWidget(); ?> 

public function rules() 
{ 
  return array( 
    array('tagname,tagtype', 'required'), 
    array('tagtype', 'numerical', 'integerOnly'=>true), 
    array('tagname', 'length', 'max'=>32), 
    array('tagname', 'match', 'pattern'=>'/^[\x{4e00}-\x{9fa5}A-Za-z0-9]+$/u', 
        'message'=>'标签不合法，必须为汉字、字母或者数字！'), 
    array('tagname', 'checktagname', 'on'=>'create,update'),//插入TAG时检查是否已经存在该tag 
    array('tagid, tagname, tagtype', 'safe', 'on'=>'search'), 
  ); 
} 

public function checktagname($attribute,$params){ 
  $oldtag = Tag::model()->findByAttributes(array('tagname'=>$this->tagname)); 
  if($oldtag->tagid > 0){ 
    $this->addError($attribute, '该TAG已经存在!'); 
  } 
} 

/**
 * @return array validation rules for model attributes.
 */
public function rules()
{
  return array(
    array('password', 'passwordStrength', 'strength'=>self::STRONG),
  );
}

/**
 * check if the user password is strong enough
 * check the password against the pattern requested
 * by the strength parameter
 * This is the 'passwordStrength' validator as declared in rules().
 */
public function passwordStrength($attribute,$params)
{
  if ($params['strength'] === self::WEAK)
    $pattern = '/^(?=.*[a-zA-Z0-9]).{5,}$/'; 
  elseif ($params['strength'] === self::STRONG)
    $pattern = '/^(?=.*\d(?=.*\d))(?=.*[a-zA-Z](?=.*[a-zA-Z])).{5,}$/'; 
    
  if(!preg_match($pattern, $this->$attribute))
   $this->addError($attribute, 'your password is not strong enough!');
}

class passwordStrength extends CValidator
{
  public $strength;
  private $weak_pattern = '/^(?=.*[a-zA-Z0-9]).{5,}$/';
  private $strong_pattern = '/^(?=.*\d(?=.*\d))(?=.*[a-zA-Z](?=.*[a-zA-Z])).{5,}$/';
...
}

/**
 * Validates the attribute of the object.
 * If there is any error, the error message is added to the object.
 * @param CModel $object the object being validated
 * @param string $attribute the attribute being validated
 */
protected function validateAttribute($object,$attribute)
{
  // check the strength parameter used in the validation rule of our model
  if ($this->strength == 'weak')
   $pattern = $this->weak_pattern;
  elseif ($this->strength == 'strong')
   $pattern = $this->strong_pattern;
  // extract the attribute value from it's model object
  $value=$object->$attribute;
  if(!preg_match($pattern, $value))
  {
    $this->addError($object,$attribute,'your password is too weak!');
  }
}