好久沒來整理文章了，閑了沒事寫篇文章記錄下php+redis實(shí)現(xiàn)商城秒殺功能。
1、安裝redis，根據(jù)自己的php版本安裝對(duì)應(yīng)的redis擴(kuò)展（此步驟簡(jiǎn)單的描述一下）
1.1.安裝php_igbinary.dll，php_redis.dll擴(kuò)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(kuò)展
ok此處已經(jīng)完成第一步redis環(huán)境搭建完成看看phpinfo
2、項(xiàng)目中實(shí)際使用redis
2.1.第一步配置redis參數(shù)如下，redis安裝的默認(rèn)端口為6379：
<?php /* 數(shù)據(jù)庫(kù)配置 */ return array( 'DATA_CACHE_PREFIX' => 'Redis_',//緩存前綴 'DATA_CACHE_TYPE'=>'Redis',//默認(rèn)動(dòng)態(tài)緩存為Redis 'DATA_CACHE_TIMEOUT' => false, 'REDIS_RW_SEPARATE' => true, //Redis讀寫分離 true 開啟 'REDIS_HOST'=>'127.0.0.1', //redis服務(wù)器ip，多臺(tái)用逗號(hào)隔開；讀寫分離開啟時(shí)，第一臺(tái)負(fù)責(zé)寫，其它[隨機(jī)]負(fù)責(zé)讀； 'REDIS_PORT'=>'6379',//端口號(hào) 'REDIS_TIMEOUT'=>'300',//超時(shí)時(shí)間 'REDIS_PERSISTENT'=>false,//是否長(zhǎng)連接 false=短連接 'REDIS_AUTH'=>'',//AUTH認(rèn)證密碼 ); ?>
2.2.實(shí)際函數(shù)中使用redis：
/**
* 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并發(fā)的情況下不會(huì)超出庫(kù)存的購(gòu)買，這個(gè)就是處理的關(guān)鍵所以思路是第一步在秒殺類的先做一些基礎(chǔ)的數(shù)據(jù)生成：
//現(xiàn)在初始化里面定義后邊要使用的redis參數(shù)
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(dāng)前商品隊(duì)列的用戶情況
$this->goods_number_key = "goods".$goods_id;//當(dāng)前商品的庫(kù)存隊(duì)列
}
$this->user_id = $this->user_id ? $this->user_id : $_SESSION['uid'];
}
2.4. 第二步就是關(guān)鍵所在，用戶在進(jìn)入商品詳情頁前先將當(dāng)前商品的庫(kù)存進(jìn)行隊(duì)列存入redis如下：
/**
* 訪問產(chǎn)品前先將當(dāng)前產(chǎn)品庫(kù)存隊(duì)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 && $this->error("當(dāng)前秒殺已結(jié)束！");
if($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(huì)員進(jìn)來隊(duì)列庫(kù)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(tǒng)繁忙，請(qǐng)稍后搶購(gòu)！");
}
}else{
$this->error("當(dāng)前產(chǎn)品已經(jīng)秒殺完！");
}
}
接下來要做的就是用ajax來異步的處理用戶點(diǎn)擊購(gòu)買按鈕進(jìn)行符合條件的數(shù)據(jù)進(jìn)入購(gòu)買的排隊(duì)隊(duì)列（如果當(dāng)前用戶沒在當(dāng)前產(chǎn)品用戶的隊(duì)列就進(jìn)入排隊(duì)并且pop一個(gè)庫(kù)存隊(duì)列，如果在就拋出，）：
/**
* 搶購(gòu)商品前處理當(dāng)前會(huì)員是否進(jìn)入隊(duì)列
* @access public
* @author bieanju
*/
public function goods_number_queue(){
!$this->user_id && $this->ajaxReturn(array("status" => "-1","msg" => "請(qǐng)先登錄"));
$model = M("flash_sale");
$where['goods_id'] = $this->goods_id;
$goods_info = $model->where($where)->find();
!$goods_info && $this->error("對(duì)不起當(dāng)前商品不存在或已下架！");
/* redis 隊(duì)列 */
$redis = $this->connectRedis();
/* 進(jìn)入隊(duì)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($goods_number_key){
// 判斷用戶是否已在隊(duì)列
if (!$redis->hGet("{$this->user_queue_key}", $this->user_id)) {
// 插入搶購(gòu)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(tǒng)繁忙,請(qǐng)重試！"));
}
}
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