登录界面：logon.php



<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用户登录</title>
</head>
    <?php
        //用户是否保持用户名和密码
        if(isset($_COOKIE['username'])){
            echo "<script language='javascript'>";
            echo "location.href='login_success.html'"; //重定向url
            echo "</script>";
        }      
    ?>
<body>
    <form action="deal_cookie.php" method="post">
        用户名：<input type="text" name="username"/><br>
        密    码：<input type="password" name="password"/><br>
        <input type="checkbox" name="save" id="save"/><label for="save">7天内自动登录</label><br>
        <input type="submit" name="login" value="提交"/>       
    </form>
</body>
</html>



cookie处理：deal_cookie.php


<?php
    //设置编码
    header('Content-Type:text/html;charset=utf-8');
    // 判断用户是否提交
    if(isset($_POST['login'])){
        //获取用户名和密码
        $username = $_POST['username'];
        $password = $_POST['password'];
                             
        if($username !="" && $password != ""){
            // 用户是否保存登录名
            if(isset($_POST['save'])){
                // 创建cookie，保存7天
                setcookie('username',$username,time()+(7*24*60*60));
                setcookie('password',$password,time()+(7*24*60*60)); 
            }
            // 重定向用户
            header('Location:login_success.html');     
        }else{
            echo "<script type='text/javascript'>alert('用户名和密码不能为空');history.back;</script>";
        }
    }
?>

成功登录：login_success.html

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>登录成功</title>
</head>
<body>
    <h1>登录成功</h1>
</body>
</html>