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]);
}