php实现七天免登录的方法：1、在前端创建一个用户选择七天免登录的按钮；2、在后端中，根据用户提交的用户名和密码查询到用户的id；3、将用户id存入cooike中；4、设置七天的过期时间即可。
本教程操作环境：windows7系统、PHP8.1版、Dell G3电脑。
php 怎么实现七天免登录？
php中实现7天免登录功能，防止cookie欺骗
1、免登录思路
用户选择七天免登录按钮，后端根据用户提交的用户名和密码查询到用户的id将用户id存入cooike中并设置七天的过期时间。在不清除cookie信息（非正常退出的时候），后台帮助用户登录。实际就是利用cooki实现。
2、验证登录文件：checkLogin.php
<?php
header('content-type:text/html;charset=utf-8');
require './config.php';
$username = $_POST['uname'];
$password = md5($_POST['pwd']);
$islogin = $_POST['islogin'];
$sql = "SELECT * FROM `mu_user` WHERE `username`=? AND `password`=? ";
$stm = $pdo -> prepare($sql);
$stm ->bindParam(1,$username);
$stm ->bindParam(2,$password);
$stm ->execute();
$res = $stm->fetch(PDO::FETCH_ASSOC);
if($stm->rowCount() == 1){
//验证成功
clearCookie();
if($islogin==1){
//记住密码
setcookie("username",$res['username'],strtotime('+7 days'));
$token = settoken($res['username'],$res['password'],$res['id']);
setcookie("token",$token,strtotime('+7 days'));
}else{
// 无记住密码
setcookie("username",$res['username']);
$token = settoken($res['username'],$res['password'],$res['id']);
setcookie("token",$token);
}
exit("
<script>
alert('登录成功！');
location.href ='index.php';
</script>
");
}else{
//验证失败
exit("
<script>
alert('用户名或密码有误！');
location.href ='login.php';
</script>
");
}
//清除cookie
function clearCookie(){
setcookie("username",'',time()-1800);
setcookie("token",'',time()-1800);
}
//设置token
function settoken($username,$password,$id)
{
$salk = "czx";
$token = md5($salk.$username.$password)."*".$id;
return $token;
}3、数据库配置文件：config.php
<?php
//主机地址
define("DB_HOST","localhost");
//数据库用户名
define("DB_USER","root");
//数据库密码
define("DB_PASSWORD","root123");
// 数据库型号
define("DB_TYPE","mysql");
// 数据库名称
define("DB_NAME","my_user");
//数据库编码
define('DB_CHARSET', 'utf8');
//数据库端口号
define('DB_PORT', '3306');
//定义PDO的DSN，数据源名，包括主机名，端口号和数据库名称。
define('DSN', DB_TYPE.":host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET);
try{
//连接数据款
$pdo = new PDO(DSN,DB_USER,DB_PASSWORD);
} catch(PDOException $e){
//捕捉特定于数据库信息的PDOEXCEPTION 异常
echo $e->getMessage();
} catch(Throwable $e){
//捕捉拥有Throwable接口的错误或者其他异常
echo $e->getMessage();
}4、登录页面文件 ： login.php
<?php
if($_GET['act'] == 'out'){
setcookie("username",'',time()-1800);
setcookie("token",'',time()-1800);
}
$token = $_COOKIE['token'];
$username = $_COOKIE['username'];
if(!empty($username) &&!empty($token)&& ($_GET['act'] != 'out')){
exit("
<script>
alert('用户已登录，请直接访问！');
location.href ='index.php';
</script>
");
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>登录</title>
</head>
<style>
*{
margin: 0px;
padding: 0;
}
.contater {
border: 1px solid #000;
width: 300px;
display: flex;
flex-direction: column;
margin: auto;
}
.contater>div {
margin-top: 20px;
}
h3 {
text-align: center;
}
.contater > .submit >input{
margin: 15px 140px;
font-size: 1.5rem;
}
</style>
<body>
<h3 >登录</h3>
<form action="checkLogin.php" method="post">
<div>
<div>
<span>用户名：</span>
<input type="text" name="uname">
</div>
<div>
<span>密 码：</span>
<input type="password" name="pwd">
</div>
<div>
<input type="radio"" name="islogin" value="1">
<span>记住密码</span>
</div>
<div>
<input type="submit" value="登录">
</div>
</div>
</form>
</body>
</html>5、首页文件：index.php
<?php
$token = $_COOKIE['token'];
$token_arr = explode("*",$token);
$uid = end($token_arr);//获取用户id
require "./config.php";
$sql = "SELECT * FROM `mu_user` WHERE `id`=?";
$stm = $pdo ->prepare($sql);
$stm ->bindParam(1,$uid);
$stm ->execute();
$result =$stm->fetch(PDO::FETCH_ASSOC);
if($stm->rowCount()==1){
$salk = "czx";
$token_res = md5($salk.$result['username'].$result['password']);
if($token_res != $token_arr[0]){
exit("
<script>
alert('请先登录');
loction.href ='login.php';
</script>
");
}
}else{
exit("
<script>
alert('请您先登录');
location.href='login.php';
</script>
");
}
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>首页</title>
</head>
<style>
* {
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
h1 {
text-align: center;
}
a {
text-decoration: none;
font-size: 1.5rem;
color: darkgray;
}
a:hover {
background-color: lightskyblue;
border-radius: 5%;
/* font-size: 2rem; */
}
li {
list-style-type: none;
color: darkgray;
}
span {
color: darkgray;
font-size: 1.5rem;
margin-right: 15px;
color:burlywood
}
.top {
/* width: 960px; */
background-color: linen;
display: flex;
flex-flow: row nowrap;
justify-content: space-between;
}
.top > div {
margin: 10px 40px;
}
.column {
/* width: 960px; */
display: flex;
flex-flow: row nowrap;
justify-content: space-around;
}
.column > li {
margin-right: 65px;
padding: 0px 20px;
}
</style>
<body>
<h1>陶转转首页</h1>
<div>
<div>
<ul>
<li><a href="">LOGO</a></li>
<li><a href="">首页</a></li>
<li><a href="">分类一</a></li>
</ul>
</div>
<div>
<span>欢迎您,<?php echo $result['username'];?></span>
<a href="./login.php?act=out">退出</a>
</div>
</div>
</body>
</html>推荐学习：《PHP视频教程》
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