11月22日—COOKIE和SESSION介绍，SESSION实战

SESSION实现登录实例

conncet.php:数据库连接文件

<?php
//数据库连接参数
$host = 'localhost';
$dbname = 'demo';
$username = 'root';
$pwd = 'root';
$dsn = "mysql:host=$host;dbname=$dbname";
try{
    $pdo = new PDO($dsn,$username,$pwd);
}catch(PDOException $e){
    die('连接失败：'.$e->getMessage());
}
 ?>

<?php
if (isset($_SESSION['name'])){
    echo '<script>alert("请不要重复登录");location.href="index.php";</script>';
}
?>
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>用户登录</title>
</head>
<body>
<h3>用户登录</h3>
<form action="dispatch.php?action=check" method="post" onsubmit="return isEmpty(this)">
    <p>
        <label for="username">账号</label>
        <input type="text" name="username" id="username">
    </p>
    <p>
        <label for="pwd">密码</label>
        <input type="password" name="pwd" id="pwd">
    </p>
    <p>
        <button>提交</button>
    </p>
</form>
</body>
<script>
    function isEmpty(form) {
        if (form.username.value == ''){
            alert('账号不能为空');
            form.username.focus();
            return false;
        }
        if (form.pwd.value == ''){
            alert('密码不能为空');
            form.pwd.focus();
            return false;
        }
        return true;
    }
</script>
</html>

dispatch.php:派发器，控制系统访问

<?php
header('content-type:text/html;charset=utf-8');
require '../connect.php';
$action = isset($_GET['action'])?$_GET['action']:'';
$action = strip_tags(strtolower(trim($action)));
switch ($action){
    case 'login':
        include 'login.php';
        break;
    case 'check':
        include 'check.php';
        break;
    case 'logout':
        include 'logout.php';
        break;
    default:
        include 'index.php';
        break;
}

index.php：首页

<?php
session_start();
header('content-type:text/html;charset=utf-8');
if (isset($_SESSION['name'])){
    echo '用户：'.$_SESSION['name'].'已登录<br>';
    echo '<a href="dispatch.php?action=logout">请退出</a>';
}else{
    echo '<a href="dispatch.php?action=login">请登录</a>';
}

check.php：验证登录功能

<?php
session_start();
header('content-type:text/html;charset=utf-8');
if ($_POST){
    $phone = trim($_POST['username']);
    $pwd = md5(trim($_POST['pwd']));
    $sql = 'SELECT * FROM `user` WHERE `phone`=:phone AND `pwd`=:pwd';
    $stmt = $pdo->prepare($sql);
    $stmt->execute(['phone'=>$phone,'pwd'=>$pwd]);
    $result = $stmt->fetch(PDO::FETCH_ASSOC);
    if ($result){
        $_SESSION['name'] = $result['name'];
        echo '<script>alert("登录成功");location.href="index.php";</script>';
    }else{
        echo '<script>alert("登录失败");history.back();</script>';
    }
}

logout.php：退出功能

<?php
session_start();
header('content-type:text/html;charset=utf-8');
if (isset($_SESSION['name'])){
    session_destroy();
    echo '<script>alert("退出成功");location.href="index.php";</script>';
}else{
    echo '<script>alert("请先登录");location.href="login.php";</script>';
}

手工抄写作业：

SESSION实现登录实例

conncet.php:数据库连接文件

login.php:登录界面

dispatch.php:派发器，控制系统访问

index.php：首页

check.php：验证登录功能

logout.php：退出功能

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