大家好:
以下是我对cookie登录和session登录案例的练习,如有错误望大家指出,谢谢
<?php $page_title = '首页'; //导入头部 include('inc/header.php'); echo '<h2 style = "color:red">首页</h2>'; //对是否登录进行判断 if ((isset($_COOKIE['user_id'])) && basename($_SERVER['PHP_SELF']) != 'logout.php') { echo '<a href="logout.php">退出</a>'; } else { echo '<a href="login.php">登录</a>'; } //导入底部 include('inc/footer.php');
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<?php $page_title = '登录页面'; //导入头部 include('inc/header.php'); ?> <h2 style="color:red">用户登录</h2> <form action="login.php" method="post"> <p> <label for="email">邮箱:</label> <input type="email" name="email" id="email" value="<?php echo isset($_POST['email'])?$_POST['email']:'' ?>"> </p> <p> <label for="password">密码:</label> <input type="password" name="password" id="password" value="<?php echo isset($_POST['password'])?$_POST['password']:'' ?>"> </p> <p><button type="submit" name="submit" id="submit">登录</button></p> </form> <?php include ('inc/footer.php'); //加载底部 ?>
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<?php if ($_SERVER['REQUEST_METHOD'] == 'POST') { //加载公共函数库 require ('inc/function.php'); //连接数据库 require ('inc/connect.php'); //验证登录 list($check, $data) = check_login($dbc, $_POST['email'], $_POST['password']); //验证通过 if ($check) { //设置cookies setcookie('user_id', $data['user_id']); setcookie('user_name', $data['user_name']); //跳转页面 redirect_user('loggedin.php'); } else { //验证失败 $errors = $data; } //关闭数据库连接 mysqli_close($dbc); } //加载 include('login_page.php');
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<?php function redirect_user($page = 'index.php') { //默认url格式 $url = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']); //如果有,去掉url右侧的斜线 $url = rtrim($url, '/\\'); //添加上当前的脚本名称,默认为:index.php $url .= '/'.$page; //跳转到指定目标地址 header('Location:'. $url); //退出当前函数 exit(); } function check_login($dbc, $email='', $password='') { //初始化错误信息数组 $errors = []; //验证邮箱 if (empty($email)) { $errors[] = '邮箱地址不能为空'; } else { //转义字符串的特殊字符 $e = mysqli_real_escape_string($dbc, trim($email)); } //验证密码 if (empty($password)) { $errors[] = '密码不能为空'; } else { $p = mysqli_real_escape_string($dbc, trim($password)); } //非空验证通过,即$error数组为空 if (empty($errors)) { //根据邮箱与密码来查询用户id与用户名 $sql = "SELECT `user_id`,`user_name` FROM `user` WHERE `email`='$e' AND `password`=sha1('$p') "; //执行查询 $res = mysqli_query($dbc, $sql); //查询成功应该返回唯一一条记录 if (mysqli_num_rows($res) == 1) { //将查询结果解析到数组中 $row = mysqli_fetch_array($res, MYSQLI_ASSOC); //返回查询结果 // print_r($row);exit(); return [true, $row]; } else { //查询失败 $errors[] = '邮箱或密码不正确,请重新输入'; } } return [false, $errors]; }
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<?php if (!isset($_COOKIE['user_id'])) { require ('inc/function.php'); //跳转到默认首页 redirect_user(); } //如果已经登录 //设置页面标题 $page_title = '已经登录'; include ('inc/header.php'); //打印欢迎信息,并提供退出功能 echo <<< "WELCOME" <h2 style="color:red">登陆成功</h2> <p>欢迎您: {$_COOKIE['user_name']}</p> <p><a href="logout.php">退出</a></p> WELCOME; //加载底部 include ('inc/footer.php');
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<?php if (!isset($_COOKIE['user_id'])) { require ('inc/function.php'); //跳转到默认首页 redirect_user(); } else { //删除cookies setcookie('user_id', '', time()-3600); setcookie('user_name','', time()-3600); } //设置页面标题 $page_title = '已经登录'; include ('inc/header.php'); //打印退出信息,并提供登录功能 echo <<< "WELCOME" <h2 style="color:red">退出成功</h2> <p><a href="login.php">登录</a></p> WELCOME; include ('inc/footer.php');
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session登录 只需在上面加上session_start();来开启会话,然后将COOKIE改成SESSION
<?php //开启会话 session_start(); $page_title = '首页'; //导入头部 include('inc/header.php'); echo '<h2 style = "color:red">首页</h2>'; //对是否登录进行判断 if ((isset($_SESSION['user_id'])) && basename($_SERVER['PHP_SELF']) != 'logout.php') { echo '<a href="logout.php">退出</a>'; } else { echo '<a href="login.php">登录</a>'; } //导入底部 include('inc/footer.php');
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课程总结
1.了解这两种登录的逻辑顺序
2.公共函数库等的引入方法
3.了解了公共函数库的各种判定和写法
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