bool setcookie(string name[,string value[,int expirel[,string path[,string domain[,int secure]]]]].
第一个：name,必选参数，这个是cookie的变量名，可以通过$_COOKIE['user']调用变量名为user的cookie.
第二：value,可选参数，这个cookie变量的值,比如说setcookie("user","php"),我们通过调用$_COOKIE['user']可以得到php值;
第三个：expire,可选参数，这个是用来设置cookie变量保存的时间，注意是我们设置的的UNIX时间戳减去当前的UNIX时间戳才是cookie变量保存的时间。（UNIX时间戳：是从1970年1月1日（UTC/GMT的午夜）开始所经过的秒数) ，一般我们可以通过time()函数获取当前的UNIX时间戳，再加上我们要保存的时间（单位为秒）比如说，setcookie("user","php",time()+3600),这样我们就可以保存user这个cookie变量的时间为3600秒。另外我们可以通过设置的时间戳小于当前的时间戳来删除cookie变量，比如说setcookie("user","php",time()-1)这样我们就删除了user这个cookie变量了。
第四个：path,cookie的有效范围，这个参数是下一个参数domain基础上的有效范围，如果path设置为"/"，那就是在整个domain都有效，比如setcookie("user","php",time()+3600,"/"),这样我们domain下的任何目录，任何文件都可以通过$_COOKIE['user']来调用这个cookie变量的值。如果path设置为"/test",那么只在domain下的/test目录及子目录才有效，比如domain下有两个目录: test1,test2,我们设置为setcookie("user","php,time()+3600,"/test1")，那么只有test1目录下才能通过$_COOKIE['user']调用user这个cookie变量的值，test2目录下获取不到。
第五个：domain,cookie有效的域名，如果domain,设置为googlephp.cn，那么在googlephp.cn下的所有子域都有效。假设googlephp.cn有两个子域，php.googlephp.cn，css.googlephp.cn，我们设置为setcookie("user","php",time()+3600,"/","php.googlephp.cn"),那么只有在php.googlephp.cn这个子域下才能获取user这个cookie变量的值. 再举一个例子：setcookie("user","php",time()+3600,"/test","php.googlephp.cn"),那么只有在php.googlephp.cn这个子域下的test目录下才能获取user这个cookie变量的值.
第六个：secure，值cookie是否仅通过安全的https,值为0或1，如果值为1，则cookie只能在https连接上有效，默认值为0，表示cookei在http和https连接上都有效。
使用cookie技术计算网站的月访问量：
<?php
header("Content-type:text/html;charset=utf-8"); //选择utf-8编码
if(empty($_COOKIE['counter'])) //如果cookie不存在
$counter=1; //设置$counter的初始值为1;
else //如果cookie存在
$counter=$_COOKIE['counter']+1 ; //每刷新一次页面，将$conunter变量的值累计加1.
//每刷新一次页面,cookie变量的值都重新赋予新的$counter的值，也就是不断累计加1.
setcookie('counter',$counter,time()+2678400);//time()+2678400就是说保存2678400秒，也就是一个月。
echo "你是第 $_COOKIE[counter] 位访客!!"; //通过$_COOKIE['counter']调用cookie变量的值。
?>如有问题，欢迎指正。
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