Kann PHP kleine Programme entwickeln?

    //未授权用户，请求微信接口，进行授权，获取用户信息
    public function saveUser()
    {
        $appid  =  "自己的appid" ;
        $code   =   $this->input->post('code');
 
        if (empty($code)){
            return $this->fail('','code不能为空');
        }
        $encryptedData   =   $this->input->post('encryptedData');
        if (empty($encryptedData)){
            return $this->fail('','encryptedData不能为空');
        }
        $iv   =   $this->input->post('iv');
        if (empty($iv)){
            return $this->fail('','iv不能为空');
        }
 
 
        $apiData = $this->getApiData($code);
 
        if(!isset($apiData['errcode'])){
            $sessionKey = $apiData['session_key'];
            //获取sessionKey  进行解密
            $userifo = new WXBizDataCrypt($appid, $sessionKey);
            $errCode = $userifo->decryptData($encryptedData, $iv, $data );
 
            //保存
            if ($errCode == 0) {
                $data = json_decode($data,true);
                $userData = [
                    'nickname' =>$data['nickName'],
                    'headimg'  =>$data['avatarUrl'],
                    'unionid'  =>$data['unionId'],
                    'openid'  =>$data['openId'],
                    'c_time'  =>time(),
                ];
                $result = $this->AppUserModel->get(['openid'=>$data['openId']]);
 
                if ($result){
                    $this->AppUserModel->update($userData,['openid'=>$data['openId']]);
                    $returnData['uid']=$result['id'];
                    return $this->success($returnData,'已授权');
                }else{
                    $userDataId = $this->AppUserModel->add($userData);
                    if ($userDataId){
                        $returnData['uid']=$userDataId;
                        return $this->success($returnData,'已授权');
                    }else{
                        return $this->fail('','授权失败');
                    }
                }
            }
        }else{
            return $this->fail($apiData,'获取用户信息失败');
        }
    }

//获取openid
    public function getApiData($code)
    {
        $appid  =  "自己的appid" ;
        $secret =   "自己的secret";
        $URL = "https://api.weixin.qq.com/sns/jscode2session?appid=$appid&secret=$secret&js_code=$code&grant_type=authorization_code";
        $apiData=file_get_contents($URL);
        return json_decode($apiData,true);
    }