针对thinkphp6做的防伪查询二维码系统，通过微信扫码会出现二次请求问题解决如下：

// 检查请求是否来自微信扫一扫  
                    if (strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false ){  
                        $pcfnum = $result1['num']+1;
                        if($pcfnum == 1){
                           $data = ['num' =>$pcfnum,'id'=>$result1['id'],'fisrt_time'=>time(),'address'=>getCity()];  
                        }else{
                           $data = ['num' =>$pcfnum,'id'=>$result1['id']];
                        }
                        // 定义操作的唯一标识符  
                        $operationKey = 'unique_operation_key';  
                        // 检查缓存中是否存在操作键  
                        if (!Cache::has($operationKey)) {  
                            Db::name('track')->save($data);
                        }  
                        // 将操作键添加到缓存中，设置过期时间为3秒  
                        Cache::set($operationKey, true, 3);
                        $result1['num'] = $result1['num'];
                    }else{
                        //记录查询数据
                        $pcfnum = $result1['num']+1;
                        if($pcfnum == 1){
                           $data = ['num' =>$pcfnum,'id'=>$result1['id'],'fisrt_time'=>time(),'address'=>getCity()];  
                        }else{
                           $data = ['num' =>$pcfnum,'id'=>$result1['id']];
                        }
                        Db::name('track')->save($data);
                        $result1['num'] = $pcfnum;                        
                    }