用memcache 做秒杀原理

秒杀的话要用memc的自减方法

开始之前

$mem=new Memcache; $num = 100;
$goods_id= $_GET['goods_id'];
$mem->set($goods_id, $num);

秒杀进行中

$goods_id=$_GET['goods_id'];
$left = $mem->decrement($goods_id);
if($left === false) {
 echo '通信失败';
} else if ($left >= 0) {
 echo '你秒杀成功了！';
} else {
 echo '木有存货了';
}