1.cookie
<?php
//创建一个cookie
setcookie(‘username‘,‘jimtang‘);
//判断是否存在
if(isset($_COOKIE[‘username‘]))
{
echo $_COOKIE[‘username‘];
}
else
{
echo ‘cookie不存在‘;
}
?>
//cookie的删除
//方法1.
<?php
setcookie(‘username‘,‘‘);//赋空值
?>
//方法2.
<?php
setcookie(‘username‘,‘jimtang‘,time()-1);//使用过期时间删除
?>
cookie的验证传递小案例
1.demo6.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> </head> <body> <form method="post" action="demo7.php"> 用户名:<input type="text" name="username" /><br /> <input type="submit" value="Login" /> </form> </body> </html>
2.demo7.php
<?php
if(isset($_POST[‘username‘])||$_POST[‘username‘]==‘jimtangyh‘)
{
setcookie(‘name‘,‘唐寅浩‘);
//echo "<script>alert(‘我进来了‘);</script>";
header(‘Location:demo8.php‘);
}
else
{
header(‘Location:demo6.html‘);
}
?>
3.demo8.php
<?php
if(isset($_COOKIE[‘name‘]))
{
echo ‘欢迎光临‘.$_COOKIE[‘name‘];
}
else
{
echo ‘非法登录‘;
}
?>
原文：http://www.cnblogs.com/niangaolizai/p/5720005.html