//模型中的验证规则
public function rules()
{
  return array(
    array('username, password', 'required'),
    array('rememberMe', 'boolean'),
    array('password', 'authenticate'),
  );
}

$model=new LoginForm;//创建一个登录表单模型
$model->attributes=$_POST['LoginForm'];//传入登录数据
CModel->setAttributes($values,$safeOnly=true)//调用CModel的setter方法
//返回model中relues中定义的安全数据，经过下面的调用流程获取一个验证器集合
//每个验证器由CValidator::createValidator($rule[1],$this,$rule[0],array_slice($rule,2))
CModel->getValidators()
->createValidators()
->rules()
CModel->validate();//遍历验证器执行验证

public static function createValidator($name,$object,$attributes,$params=array())
{
  if(is_string($attributes))
    $attributes=preg_split('/[\s,]+/',$attributes,-1,PREG_SPLIT_NO_EMPTY);
  if(isset($params['on']))
  {
    if(is_array($params['on']))
      $on=$params['on'];
    else
      $on=preg_split('/[\s,]+/',$params['on'],-1,PREG_SPLIT_NO_EMPTY);
  }
  else
    $on=array();
  if(method_exists($object,$name))
  {
    $validator=new CInlineValidator;
    $validator->attributes=$attributes;
    $validator->method=$name;
    if(isset($params['clientValidate']))
    {
      $validator->clientValidate=$params['clientValidate'];
      unset($params['clientValidate']);
    }
    $validator->params=$params;
    if(isset($params['skipOnError']))
      $validator->skipOnError=$params['skipOnError'];
  }
  else
  {
    $params['attributes']=$attributes;
    if(isset(self::$builtInValidators[$name]))
      $className=Yii::import(self::$builtInValidators[$name],true);
    else
      $className=Yii::import($name,true);
    $validator=new $className;
    foreach($params as $name=>$value)
      $validator->$name=$value;
  }
  $validator->on=empty($on) ? array() : array_combine($on,$on);
  return $validator;
}