抽奖锁

        $redis = cmsRedis::getInstance();
        $lockKey = '';
        if(cmsRedis::$isConnect){
            // 抽奖锁，验证同一时间最大抽奖数量限制
            $limitKey = sprintf(cmsRedis::Pre_TurntableMobileLock,'*');
            $limitKeyList = $redis->keys($limitKey);
            if(count($limitKeyList) >= $this->drawLimit){
                $data['msg'] = '服务器繁忙，请稍后再试。';
                $this->ajax_return1($data, 'Busy Server', 2);
            }
            // 抽奖锁,同时只接受一个抽奖的提交     
            $mobile = (string)$mobile;
            $lockKey = sprintf(cmsRedis::Pre_TurntableMobileLock,$mobile);
            $lockValue = rand(0,99999999);
            $redis->setnx($lockKey,$lockValue);
            $setLockValue = $redis->get($lockKey);
            if($setLockValue != $lockValue){
                $data['msg'] = '请勿多次提交.';
                $this->ajax_return1($data, 'Invalid Request', 2);
            }
            $redis->expire($lockKey,60);
        }

 目的：同一时间最大抽奖数量限制为50

代码设计：

1.定义模式$key='turntable::*'

2.抽奖开始，将信息存入redis，key='turntable::手机号'，值随机数，抽奖结束释放该键

3.用户抽奖前，读取匹配该模式的键数量，小于50允许执行，大于50返回"系统繁忙"