php - Custommize get column from findAll function Yii -

i have problem that, using criteria customize number column query

 $criteria=new cdbcriteria();             $criteria->select =array('companyname', 'companycountcoupon','companydes', 'companylogo');             $models = company::model()->findall($criteria); 

after put array , echo result

    $rows = array();         foreach($models $i=>$model1) {             $rows[$i] = $model1->attributes;         }     echo  cjson::encode($rows) 

my problem results contains attributes of table, , attributes not in criteria->select set = null

   {"companyname":"abc","companycountcoupon":"0","companydes":"hello","companylogo":"\/upload\/company\/abc.jpg",**"companyid":null,"companywebsite":null,"companyadrress1":null,"companyadrress2":null,"companyphone1":null,"companyphone2":null**} 

please me. all

if go findall() (using activerecord) won't able control part, way go custom query :

$results = yii::app()->db->createcommand()     ->select('companyname ,companycountcoupon ,companydes ,companylogo')     ->from('company')     //->where() // part     ->queryall();  echo  cjson::encode($results); 

now json encoded , faster regular activerecord