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数据库管理网站数据和会话机制原理与实现--2019/07/25
LISTEN的博客
Original
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1、改写23日案例,用数据库管理网站内容

只需要修改header.php文件,让网站的数据来自数据库。

实例

<?php

// 网站数据来自数据表
// 1 连接数据库
require __DIR__."/connect.php";

//2、获取导航栏目
$sql='select `nav_id`,`name`,`alias`,`image` from `nav`';
$stmt=$pdo->prepare($sql);
$stmt->execute();
$navs=$stmt->fetchAll(PDO::FETCH_ASSOC);

//3、获取栏目详情
$sql='select * from `details`';
$stmt=$pdo->prepare($sql);
$stmt->execute();
$details=$stmt->fetchAll(PDO::FETCH_ASSOC);


// 4. 获取网站的系统设置
$sql='select * from `system` limit 1';
$stmt=$pdo->prepare($sql);
$stmt->execute();
$system=$stmt->fetch(PDO::FETCH_ASSOC);

?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <link rel="stylesheet" href="../static/css/header.css">
    <link rel="stylesheet" href="../static/css/footer.css">
    <link rel="stylesheet" href="../static/css/about.css">
    <meta name="description" content="<?php echo $system['desc']; ?>">
    <meta name="keywords" content="<?php echo $system['key']; ?>">
    <title><?php echo $system['title']; ?></title>
</head>
<body>
<!-- 头部 -->
<div class="header">
    <div class="content">
        <ul class="nav">
            <li class="item"><a href="index.php">首页</a></li>
            <?php foreach ($navs as $nav) : ?>
                <li class="item"><a href="list.php?nav_id=<?php echo $nav['nav_id']; ?>"><?php echo $nav['alias'];?></a></li>
            <?php endforeach;?>
        </ul>
    </div>
</div>

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2、cookie设置

实例

<?php

// `$_COOKIE`: 超全局变量数组
// `setcookie()`: 设置客户端cookie

// 1. 设置cookie
//setcookie('username','admin');
//setcookie('user_id',20,time()+20);//设置该cookie失效时间,20秒后失效消失

// 2. 读取cookie
//echo $_COOKIE['username'].'<br>';

// 3. 更新cookie,但浏览器未写入,即控制台仍然为原先数值
//$_COOKIE['username']='admin111';
//echo $_COOKIE['username'];

// 4. 销毁cookie
//unset($_COOKIE['username']);
//setcookie('username','',time()-3600);

setcookie('user[name]','admin');
setcookie('user[id]',100);
setcookie('user[email]','admin@php.cn');

if(isset($_COOKIE['user'])){
    foreach ($_COOKIE['user'] as $key=>$value){
        echo "{$key}=>{$value}<br>";
    }
}

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3、session设置

实例

<?php
// 1. 启动会话 查看文件位置:Extensions\tmp\tmp
session_start();

// 2. 设置session
$_SESSION['username']='admin';
$_SESSION['user_id']=111;
$_SESSION['email']='abc@qq***';

// 3 读取session
echo $_SESSION['username'].'<br>'.$_SESSION['user_id'].'<br>'.$_SESSION['email'];

// 4.销毁session
// 4.1. 只是清空服务器上的session文件内容
//session_unset();

// 4.2.将服务器保存的sesson文件删除(内容当然是清空的)
//session_destroy();

// 4.3. 将浏览器上保存到cookie中的PHPSESSID删除
setcookie('PHPSESSID','',time()-3600);

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Correction status:qualified

Teacher's comments:写得完整
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