ai插件，怎么作为api 使用的时候如何处理返回消息

                    $result = $PublicHttp->gendPost('app/ai/message/send', [
                        'prompt' => $params['prompt']
                    ]);
                    $data = explode('data:', $result);
                    $content = '';
                    foreach ($data as $value) {
                        $res = json_decode($value, true);
                        if (!empty($res['choices'][0]['delta']['content'])) {
                            $content .= $res['choices'][0]['delta']['content'];
                        }
                    }