php商城秒杀，可以购买多件商品，redis防高并发

Posted 2020-12-28 泽一年

<?php

header(‘content-type:text/html;charset=utf-8‘);
echo time();
class SeckillRedis {

    static protected $validity_time = 30; // 有效期 5分钟
 protected $goods_id;
 protected $user_queue_key;
 protected $goods_number_key;
 protected $user_id;

 public function __construct($goods_id,$area_id,$uid){
  if($goods_id){
   $this->goods_id=$goods_id;
   //当前商品队列的用户情况
   $this->user_queue_key="goods_".$goods_id."_user";
   //当前商品的库存队列
   $this->goods_number_key="goods_".$goods_id;
  }
  $this->user_id=$uid ? $uid : 2;
 }
 
 /* redis链接 */

 static public function getRedis(){
  $redis=new Redis();
  $redis->connect(‘127.0.0.1‘,‘6379‘) or die(‘Can not Content Redis‘);
  if($redis){
   return $redis;
  }else{
   die(‘Can not Content Redis!‘);
  }
 }

 // 添加或改变库存时初始化队列
 public function kuCun($num){
  $redis=$this->getRedis();
  $redis->delete($this->goods_number_key);
  // $redis->delete($this->user_queue_key);
  for ($i=0; $i < $num; $i++) {

   $redis->rPush($this->goods_number_key, 1);

  }
 }

 // 判断未支付订单是否过期 ,定时更新秒杀商品入口人数

 public function poling_set_seckill_redis(){
  $redis=$this->getRedis();
  //exists检查key是否存在,存在返回1，不存在返回0,0也属于不存在的
  if($redis->exists($this->user_queue_key) == true){

   // 清除过期的使用数量

   $use_list = $redis->lRange($this->user_queue_key, 0, -1);
   // var_dump($use_list);
   foreach ($use_list as $k => $v) {

    $data = json_decode($v, true);

    if(time() - $data[‘time‘] > self::$validity_time){

     // 超过有效期 删除

     $this->returnFree($k,$data[‘uid‘],$data[‘num‘]);

    }

   }

  }

 }
 
 /* 获取空闲抢购--num:购买件数 */

 public function getFree($num){

  if(empty($this->user_id)){

   return array(‘result‘ => false, ‘message‘ => ‘抢购信息:用户ID不能为空‘);

  }

  $redis = self::getRedis();

  if($redis->llen($this->goods_number_key)>=$num){
   for ($i=0; $i < $num; $i++) {
    $result = $redis->lPop($this->goods_number_key);
   }
   // $result = $redis->lrem($this->goods_number_key,‘1‘,$num);
   // var_dump($redis->lrange($seckill_array[$type][‘free_key‘],0,-1));
   if($result == true){

    // 添加使用数量

    $index = $redis->rPush($this->user_queue_key, json_encode(array(‘uid‘ => $this->user_id, ‘time‘ => time(),‘num‘ => $num))) - 1;

    return array(‘result‘ => true, ‘index‘ => $index);

   }else{

    return array(‘result‘ => false, ‘message‘ => ‘抢购信息:被抢光啦‘);

   }
  }else{
   return array(‘result‘ => false, ‘message‘ => ‘抢购信息:库存不够‘);
  }
   

 }

 /* 返回空闲抢购--$index为键值 */

 public function returnFree($index,$uid,$num){

  $redis = self::getRedis();

  $value = $redis->lGet($this->user_queue_key,$index);
  var_dump($value.‘hh‘);
  if(!empty($value)){

   $redis->lRem($this->user_queue_key, $value, 1);

   // 添加空闲数量
   for ($i=0; $i < $num; $i++) {
    $redis->rPush($this->goods_number_key, 1);
   }
   

   // $sql语句，库存加1

   return array(‘result‘ => true);

  }else{

   return array(‘result‘ => false, ‘message‘ => ‘抢购信息:不存在索引‘);

  }

 }

}

class Index{

 

 /* 某个需要控制并发的控制器方法 */

 public function getOrderInfo(){

  $miaosha=new SeckillRedis(‘3‘,‘123‘,‘2‘);
  // $miaosha->kuCun(‘100‘);
  $miaosha->poling_set_seckill_redis();
  $result = $miaosha->getFree(‘1‘);
  return $result;
  if($result[‘result‘] == false){

   // 没有机会 返回错误信息

   return ‘网络繁忙，请重试‘;

  }

  // 处理数据库代码

 }
}

$hua = new Index;
var_dump($hua->getOrderInfo()).‘<br>‘;
$redis=SeckillRedis::getRedis();

echo $redis->llen(‘goods_3‘);
var_dump($redis->lrange(‘goods_3‘,0,-1));
var_dump($redis->lrange(‘goods_3_user‘,0,-1));