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问一个新手有关问题（只有几行代码）

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Release： 2016-06-13 13:36:16
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问一个新手问题（只有几行代码）
$count=$_COOKIE[nam];
$count++;
setcookie("nam",$count,time()+300);
echo "欢迎光临！
你是第 $count 位光临本站者";
?>
这段代码为什么能记录访问人数？cookie不是存放在访客电脑上的吗？这样不是只能记录该浏览器访问的次数吗？

------解决方案--------------------

探讨
$count=$_COOKIE[nam];
$count++;
setcookie("nam",$count,time()+300);
echo "欢迎光临！
你是第 $count 位光临本站者";
?>
这段代码为什么能记录访问人数？cookie不是存放在访客电脑上的吗？这样不是只能记录该浏览器访问的次数吗？

------解决方案--------------------
探讨
$_COOKIE存储在客户端。但当每次有http请求时，浏览器就会将该网站所对应的Cookie发送到服务器端。
php的$_COOKIE超级变量的值就是这么来的。
如果要设新的值，服务器再通过setcookie()发送http报头来设置

------解决方案--------------------
探讨
$count=$_COOKIE[nam];
$count++;
setcookie("nam",$count,time()+300);
echo "欢迎光临！
你是第 $count 位光临本站者";
?>
这段代码为什么能记录访问人数？cookie不是存放在访客电脑上的吗？这样不是只能记录该浏览器访问的次数吗？

------解决方案--------------------
这只是个例子。并不是真的
Related labels：
cookie count quot setcookie
source：php.cn
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