1，安裝redis，根據自己的php版本安裝對應的redis擴展（此步驟簡單的描述一下）
1.1，安裝 php_igbinary.dll，php_redis.dll擴展此處需要注意你的php版本如圖：
1.2，php.ini文件新增 extension=php_igbinary.dll;extension=php_redis.dll兩處擴展
ok此處已經完成第一步redis環境搭建完成看看phpinfo
項目中實際使用redis
2.1，第一步配置redis參數如下，redis安裝的默認端口爲6379：
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<?php/*
數據庫配置 */return array( 'DATA_CACHE_PREFIX' => 'Redis_',//緩存前綴 'DATA_CACHE_TYPE'=>'Redis',//默認動態緩存爲Redis 'DATA_CACHE_TIMEOUT' =>
false, 'REDIS_RW_SEPARATE' =>
true, //Redis讀寫分離
true 開啓 'REDIS_HOST'=>'127.0.0.1', //redis服務器ip，多臺用逗號隔開；讀寫分離開啓時，第一臺負責寫，其它[隨機]負責讀； 'REDIS_PORT'=>'6379',//端口號 'REDIS_TIMEOUT'=>'300',//超時時間 'REDIS_PERSISTENT'=>false,//是否長連接
false=短連接 'REDIS_AUTH'=>'',//AUTH認證密碼 );?> |
2.2，實際函數中使用redis：
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/** *
redis連接 *
@access private *
@return resource *
@author bieanju */ private function connectRedis(){ $redis=new \Redis(); $redis->connect(C("REDIS_HOST"),C("REDIS_PORT")); return $redis; } |
2.3，秒殺的核心問題是在大併發的情況下不會超出庫存的購買，這個就是處理的關鍵所以思路是第一步在秒殺類的先做一些基礎的數據生成：
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//現在初始化裏面定義後邊要使用的redis參數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";//當前商品隊列的用戶情況 $this->goods_number_key
= "goods".$goods_id;//當前商品的庫存隊列 } $this->user_id
= $this->user_id
? $this->user_id
: $_SESSION['uid']; } |
2.4,第二步就是關鍵所在，用戶在進入商品詳情頁前先將當前商品的庫存進行隊列存入redis如下：
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/** *
訪問產品前先將當前產品庫存隊列 *
@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 && $this->error("當前秒殺已結束！"); if($goods['goods_num']
> $goods['order_num']){ $redis = $this->connectRedis(); $getUserRedis = $redis->hGetAll("{$this->user_queue_key}"); $gnRedis = $redis->llen("{$this->goods_number_key}"); /*
如果沒有會員進來隊列庫存 */ if(!count($getUserRedis)
&& !$gnRedis){ for ($i =
0; $i < $goods['goods_num']; $i ++)
{ $redis->lpush("{$this->goods_number_key}",
1); } } $resetRedis = $redis->llen("{$this->goods_number_key}"); if(!$resetRedis){ $this->error("系統繁忙，請稍後搶購！"); } }else{ $this->error("當前產品已經秒殺完！"); } } |
接下來要做的就是用ajax來異步的處理用戶點擊購買按鈕進行符合條件的數據進入購買的排隊隊列（如果當前用戶沒在當前產品用戶的隊列就進入排隊並且pop一個庫存隊列，如果在就拋出，）：
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/** *
搶購商品前處理當前會員是否進入隊列 *
@access public *
@author bieanju */ public function goods_number_queue(){ !$this->user_id
&& $this->ajaxReturn(array("status" => "-1","msg" => "請先登錄")); $model =
M("flash_sale"); $where['goods_id']
= $this->goods_id; $goods_info = $model->where($where)->find(); !$goods_info && $this->error("對不起當前商品不存在或已下架！"); /*
redis 隊列 */ $redis = $this->connectRedis(); /*
進入隊列 */ $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($goods_number_key){ //
判斷用戶是否已在隊列 if (!$redis->hGet("{$this->user_queue_key}", $this->user_id))
{ //
插入搶購用戶信息 $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" => "系統繁忙,請重試！")); } } |
附加一個調試的函數，刪除指定隊列值：
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public function clearRedis(){ set_time_limit(0); $redis = $this->connectRedis(); //$Rd
= $redis->del("{$this->user_queue_key}"); $Rd = $redis->hDel("goods49",'用戶id''); $a = $redis->hGet("goods_49_user", '用戶id'); if(!$a){ dump($a); } if($Rd ==
0){ exit("Redis隊列已釋放！"); } } |