<?php echo $form->select2Row($model, 'service_id', [
            if ($model->contract_id !== 0){
               'data' => Service::getAllContract($model->contract_id);
            } else{
               'data' => Service::getAllContractone($model->CUers_id);
            }
            'multiple' => false,
            'id' => 'service',
            'required' => true,
            'options' => ['width' => '220 px'], ]); ?>