How does redis solve the flash sale and overselling problem?

First, generate the inventory count

public function kucun() { //有十个库存 $count=10; //添加到redis list中 for($i=0;$i<$count;$i++){ Predis::getInstance()->lpush('kucun',111111111); } self::dd(Predis::getInstance()->lrange('kucun',0,-1)); }

After completion, use redis's lpop or rpop to cut the list. Previously, llen or incr was used to judge the data. , there will be oversold phenomenon, so the logic of lpop is used here to solve the oversold problem

public function ru() { //判断计数器 if (Predis::getInstance()->lpop('kucun')) { $user=User::where('user_id',1082)->find(); //存入会员id Predis::getInstance()->lpush('user',$user['user_id']); //计数器累计加1 // Predis::getInstance()->incr('number'); echo '加入秒杀成功';exit(); }else{ echo '活动截至'; exit(); } }

Test:

ab -r -n 1000 -c 1000 http://149.28.16.212/index/index/ru

More Redis related knowledge , please visit theRedis usage tutorialcolumn!

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