common\models\Member::findIdentity PHP Method

    public static function findIdentity($id)
    {
        return static::findOne(['id' => $id, 'status' => self::STATUS_ACTIVE]);
    }

 public function actionAdmin()
 {
     $user_id = yii::$app->getUser()->id;
     $params = array_merge(Yii::$app->request->queryParams, ['PostSearch' => ['user_id' => $user_id]]);
     $user_name = Member::findIdentity($user_id)->name;
     $title = '用户' . $user_name . '下的日志';
     $searchModel = new PostSearch();
     $dataProvider = $searchModel->search($params);
     return $this->render('admin', ['searchModel' => $searchModel, 'dataProvider' => $dataProvider, 'title' => $title]);
 }