在不适用额外js，如何将表验证器返回值,显示再表单中

International Chinese
1 
namespace app\models;
class Financing extends \yii\db\ActiveRecord
{
public function rules()
    {
        return [
           [['Total_investment','Self_financing',"Financing_amount","Plan_bond"],'integer'],
            ['Plan_bond','validatePlan_bond','skipOnEmpty' => false, 'skipOnError' => false],
        ];
    }
/*
*/
public function validatePlan_bond($attribute)
    {
        if( $this->Total_investment > 0
            and $this->Self_financing >0
        ){
           //在不适用额外的js的情况下，将Plan_bond的值页面的表单元素中，
            $this->Plan_bond = $this->Total_investment-$this->Self_financing-$this->Financing_amount;
            }
        }
    }
}