有胆量你就来跟着路老师卷起来！ -- 纯干货，技术知识分享
路老师给大家分享PHP语言的知识了，旨在想让大家入门PHP，并深入了解PHP语言。
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七天免登录功能案例
1 创建users用户表，并添加一个用户。
CREATE TABLE `users` ( `id` int(8) NOT NULL AUTO_INCREMENT, `username` varchar(50) NOT NULL, `password` varchar(255) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 其中密码是md5处理过的密文 insert into `users` values('1','test','098f6bcd4621d373cade4e832627b4f6');
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2 创建登录页面login.php：
<html lang="en" class="is-centered is-bold"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>登录页面</title> <link href="css/login.css" rel="stylesheet"> </head> <body> <section style="background: transparent;"> <form class="box py-3 px-4 px-2-mobile" role="form" method="post" action="checklogin.php" onsubmit="return check()" > <div class="is-flex is-column is-justified-to-center"> <h1 class="title is-3 mb-a has-text-centered"> 登录 </h1> <div class="inputs-wrap py-3"> <div class="control"> <input class="input" type="text" id="username" name="username" placeholder="用户名" required></input> </div> <div class="control"> <input class="input" type="password" id="password" name="password" placeholder="密码" required></input> </div> <div class="control"> <button class="button is-submit is-primary is-outlined" type="submit"> 提交 </button> </div> </div> <footer class="footer-box"> <div style="display: inline-block"> <input type="checkbox" name="keep" id="keep" checked value="">七天免登录 </div> <a href="register.html"> 暂无账号，点击去登陆 </a> </footer> </div> </form> </section> <script> function check(){ if(document.getElementById("keep").checked){ document.getElementById("keep").value =1; } } </script> </body> </html>
其中内部样式表login.css如下：
.title{ color:rgb(116, 116, 116); font-size: 32px; text-align: center; } .box{ width: 300px; height: 150px; background-color: #00f7ff; } .py-3{ width: 200px; height: 30px; background-color: pink; } .is-flex{ width: 300px; height: 350px; border: 15px solid #02632c; background-color: rgb(255, 255, 255); } .inputs-wrap{ margin: 0 auto; } .control .input{ width: 200px; height: 26px; margin-bottom: 25px; border: 1px solid #02632c; border-radius: 5px; } .control button{ width: 200px; border-radius: 5px; border: 1px solid #9fb9aa; font-size: 16px; color: #363636; background-color: #b1f3cd; margin-left: 2px; } .footer-box{ width: 240px; height: 100px; margin-top: 110px; margin-left: 45px; color: #02632c; font-size: 12px; } .footer-box input{ float: left; } .footer-box a{ float: right; font-size: 12px; color: rgb(248, 91, 91); text-decoration: none; }
登录页面效果如下：
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3 创建checkLogin.php
接下来实现登录成功的检测，创建checkLogin.php用来检测：
if(isset($_POST['username']) && isset($_POST['password'])){ $username = trim($_POST['username']); $password = md5(trim($_POST['password'])); require "config.php"; try { $pdo = new PDO("mysql:host=".DB_HOST.";dbname=".DB_NAME,DB_USER,DB_PWD); } catch (PDOException $e) { echo $e->getMessage(); } $sql = 'select * from users where username = :username and password = :password'; $result = $pdo->prepare($sql); $result->bindParam(':username',$username); $result->bindParam(':password',$password); if($result->execute()){ $rows=$result->fetch(PDO::FETCH_ASSOC); if($rows){ if(isset($_POST['keep'])){ //勾选七天免登录 setcookie('username',$rows['username'],time()+604800); }else{ setcookie('username',$rows['username']); } echo "<script>alert('恭喜您，登录成功！'); window.location.href='index.php';</script>"; }else{ echo "<script>alert('用户名或密码错误，登录失败！'); history.back();</script>"; exit(); } }else{ echo "<script>window.location.href='login.php';</script>"; } }
checkLogin.php的config.php配置文件也给贴下面（不要嫌弃我啰嗦哦）：
define('DB_HOST','localhost'); define('DB_USER','***');//你的数据库服务器登录用户 define('DB_PWD','*****');//替换成你的数据库服务器密码 define('DB_NAME','db_test');//替换成你的数据库名 define('DB_PORT','3306'); define('DB_TYPE','mysql'); define('DB_CHARSET','utf8'); define('DB_DSN',"mysql:host=".DB_HOST.";dbname=".DB_NAME.";charset=".DB_CHARSET);
此时你可以进行登录检测了。故意输入错误，会提示如下内容：
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4 登录成功的界面index.php：
date_default_timezone_set('PRC'); //如果cookie不存在，那就是第一次访问网站 if(!isset($_COOKIE["username"])){ echo "<script>alert('请先登录'); window.location.href='login.php';</script>"; } <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>欢迎界面</title> <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" rel="stylesheet"> </head> <body class="container"> <div class="jumbotron" style="background-color:#17ecf1"> <h1>欢迎 <span style="color:white;font-weight:700"> echo $_COOKIE['username']; </span> 登录网站 </h1> <p><a class="btn btn-warning btn-lg" href="logout.php" role="button">退出登录</a></p> </div> </body> </html>
我们测试一下，登录成功后的效果，此时你拷贝这个连接到新开一个浏览器页面，会出现不需要登录就能成功进入主页。
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顺手把退出登录的功能也给实现了logout.php：
setcookie("username","",time()-1); echo "<script>window.location.href='login.php';</script>";
此文到此接触！
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