PHP and redis realize mall flash sale function code sharing

This article mainly introduces php+redis to realize the flash sale function of the mall. It has certain reference value. Interested friends can refer to it. I hope it can help everyone.

1. Install redis and install the corresponding redis extension according to your own PHP version (this step is briefly described)

1.1. Install php_igbinary.dll. The php_redis.dll extension needs attention here. Your php version is as shown below:

##1.2.php.ini file adds extension=php_igbinary.dll;extension=php_redis.dll two extensions

ok The first step of setting up the redis environment has been completed. Take a look at phpinfo

2. The actual use of redis in the project

2.1. The first step is to configure redis The parameters are as follows. The default port for redis installation is 6379:

<?php
/* 数据库配置 */
return array(
  &#39;DATA_CACHE_PREFIX&#39; => &#39;Redis_&#39;,//缓存前缀
  &#39;DATA_CACHE_TYPE&#39;=>&#39;Redis&#39;,//默认动态缓存为Redis
  &#39;DATA_CACHE_TIMEOUT&#39; => false,
  &#39;REDIS_RW_SEPARATE&#39; => true, //Redis读写分离 true 开启
  &#39;REDIS_HOST&#39;=>&#39;127.0.0.1&#39;, //redis服务器ip，多台用逗号隔开；读写分离开启时，第一台负责写，其它[随机]负责读；
  &#39;REDIS_PORT&#39;=>&#39;6379&#39;,//端口号
  &#39;REDIS_TIMEOUT&#39;=>&#39;300&#39;,//超时时间
  &#39;REDIS_PERSISTENT&#39;=>false,//是否长连接 false=短连接
  &#39;REDIS_AUTH&#39;=>&#39;&#39;,//AUTH认证密码 
);
?>

2.2. Use redis in the actual function:

/**
    * redis连接
    * @access private
    * @return resource
    * @author bieanju
    */
  private function connectRedis(){
    $redis=new \Redis();
    $redis->connect(C("REDIS_HOST"),C("REDIS_PORT"));    
    return $redis;
  }

2.3. The core issue of the flash sale is that the purchase will not exceed the inventory in the case of large concurrency. This is the key to processing, so the idea is to do some basic data generation in the flash sale category as the first step:

//现在初始化里面定义后边要使用的redis参数
public function _initialize(){
    parent::_initialize();
    $goods_id = I("goods_id",'0','intval');   
    if($goods_id){
      $this->goods_id = $goods_id;
      $this->user_queue_key = "goods_".$goods_id."_user";//当前商品队列的用户情况
      $this->goods_number_key = "goods".$goods_id;//当前商品的库存队列
    }
    $this->user_id = $this->user_id ? $this->user_id : $_SESSION['uid'];   
  }

2.4. The second step is the key. Before entering the product details page, the user first queues the inventory of the current product and stores it in redis as follows:

/**
  * 访问产品前先将当前产品库存队列
  * @access public
  * @author bieanju
  */
  public function _before_detail(){
    $where['goods_id'] = $this->goods_id;
    $where['start_time'] = array("lt",time());
    $where['end_time'] = array("gt",time());
    $goods = M("goods")->where($where)->field('goods_num,start_time,end_time')->find();
    !$goods && $this->error("当前秒杀已结束！");
    if($goods['goods_num'] > $goods['order_num']){
      $redis = $this->connectRedis();
      $getUserRedis = $redis->hGetAll("{$this->user_queue_key}");
      $gnRedis = $redis->llen("{$this->goods_number_key}");
      /* 如果没有会员进来队列库存 */
      if(!count($getUserRedis) && !$gnRedis){      
        for ($i = 0; $i < $goods[&#39;goods_num&#39;]; $i ++) {
          $redis->lpush("{$this->goods_number_key}", 1);
        }
      }
      $resetRedis = $redis->llen("{$this->goods_number_key}");
      if(!$resetRedis){
        $this->error("系统繁忙，请稍后抢购！");
      }
    }else{
      $this->error("当前产品已经秒杀完！");
    }
     
  }

The next thing to do is to use ajax to asynchronously process the user's click on the purchase button and enter the qualifying data into the purchase queue (if the current user is not in the queue of the current product user, enter the queue and pop an inventory queue , if it is thrown,):

/**
   * 抢购商品前处理当前会员是否进入队列
   * @access public
   * @author bieanju
   */
  public function goods_number_queue(){
    !$this->user_id && $this->ajaxReturn(array("status" => "-1","msg" => "请先登录"));
    $model = M("flash_sale");
    $where['goods_id'] = $this->goods_id;
    $goods_info = $model->where($where)->find();
    !$goods_info && $this->error("对不起当前商品不存在或已下架！"); 
    /* redis 队列 */ 
    $redis = $this->connectRedis();
    /* 进入队列 */
    $goods_number_key = $redis->llen("{$this->goods_number_key}");
    if (!$redis->hGet("{$this->user_queue_key}", $this->user_id)) {
      $goods_number_key = $redis->lpop("{$this->goods_number_key}");
    }
     
    if($goods_number_key){
      // 判断用户是否已在队列
      if (!$redis->hGet("{$this->user_queue_key}", $this->user_id)) {
        // 插入抢购用户信息
        $userinfo = array(
          "user_id" => $this->user_id,
          "create_time" => time()
        );        
        $redis->hSet("{$this->user_queue_key}", $this->user_id, serialize($userinfo));
        $this->ajaxReturn(array("status" => "1"));
      }else{
        $modelCart = M("cart");
        $condition['user_id'] = $this->user_id;
        $condition['goods_id'] = $this->goods_id;
        $condition['prom_type'] = 1;
    $cartlist = $modelCart->where($condition)->count();
        if($cartlist > 0){
          $this->ajaxReturn(array("status" => "2"));
        }else{
         
          $this->ajaxReturn(array("status" => "1"));
         
        }
         
      }
       
    }else{
      $this->ajaxReturn(array("status" => "-1","msg" => "系统繁忙,请重试！"));
    }
  }

Attach a debugging function to delete the specified queue value:

public function clearRedis(){
     set_time_limit(0);
     $redis = $this->connectRedis();
     //$Rd = $redis->del("{$this->user_queue_key}");
     $Rd = $redis->hDel("goods49",'用户id'');
     $a = $redis->hGet("goods_49_user", '用户id');
     if(!$a){
       dump($a);
     }
     
     if($Rd == 0){
       exit("Redis队列已释放！");      
     }
   }

When we get here, the core of the flash sale is basically finished. The details still need to be improved by ourselves, such as the processing of the shopping cart and the processing of orders. Well, start running the program and use apache's own ab to perform simple The simulated concurrency test is as follows:

When I run it, redis does not respond at all. At this time, there is one important step missing, which is to open the redis service. Please follow the instructions of your own system. For the next redis service management tool of redisbin_x32 or redisbin_x64, click redis-server.exe, ok. Now everything is completed as shown below:

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