yii2.0的自定義驗證規則示例

['proj_1st_id', 'check'],      

public function check($attribute, $params){
    if(!$this->hasErrors()){
        if($this->position == 1 && empty($this->proj_1st_id)){
            $this->addError($attribute,'位置為一級項目輪播圖時，一級項目為必填');
        }
    }
}      

[
    ['href'],
    'required',
    'when' => function($model) {
        return $model->link_type == 1;
    },
    'whenClient' => "function(attribute, value) {
        return $('#banner-link_type').val() == '1';
    }",
   // 'on' => '',
],