使用cookie实现统计访问者登陆次数
复制代码 代码如下:
<?php
$_COOKIE["counter"]?($c=$_COOKIE["counter"]+1):($c=1);
setCookie("counter",$c,time()+60);
echo "<b>欢迎您第"."<font color=#ff0000>".$c."</font>次访问cookie</b>";
?>
在这个应用程序中,首先是浏览器请求一个资源(这个php页面) ,发送下面的HTTP包头内容到服务器:
GET http://localhost/index.php HTTP/1.1
HOST:localhost
Accept:*/*
Accept-language:zh-cn
Accept-Encoding:gzip,deflate
User-Agent:Mozilla/4.0 (compatible;MSIE 6.0;Windows NT 5.1;SV1)
Connection:Keep-Alive
---------------------------------------------------------------------------
现在是动态网页程序(index.php)创建了Cookie,那么,服务器会传输下面的HTTP报头内容到浏览器:
HTTP/1.1 200 OK
Server:Apache/2.2.6 (Win32) PHP/5.2.6
Date:Fri,23 Mar 2009 23:15:55 GMT
Connection:Keep-Alive
Content-Length:65
Content-Typt:text/html
Set-Cookie:VisitorCount=1; expires=Thr,30-Jul-2010 16:00:00 GMT;domain=localhost;path=/
Cache-control:private
GET http://localhost/index.php HTTP/1.1
---------------------------------------------------------------------------
这将在客户端保存一个cookie文件,并保存$c变量
当再次请求时,就会将cookie中的数据传给服务器,例如下边的HTTP请求报头:
Accept:*/*
Accept-language:zh-cn
Pragma:no-cache
User-Agent:Mozilla/4.0(compatible;MSIE 6.0;Windows NT 5.1; SV1)
Host:localhost
Connection:Keep-Alive
Cookie:VisitorCount=1