public function actionCreateCode() { $model = new Invite(); $model->setScenario('invite'); if ($model->load(Yii::$app->request->post()) && $model->save()) { Yii::$app->session->setFlash('success', '邀请码生成成功'); return $this->redirect(['invite']); } return $this->render('invite', ['model' => $model, 'invite_code' => StringHelper::randomkeys(8)]); }