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老师批语：
PHP基础9
主要知识点
1). cookie 基础运用
2). session 基础运用
cookie与session会话机制的优缺点分析
代码
Cookie
inc/config.php
<?php
DEFINE('DB_HOST','127.0.0.1');
DEFINE('DB_USER','root');
DEFINE('DB_PASS','root');
DEFINE('DB_NAME','php');
DEFINE('DB_CHAR','utf8');inc/db.php
<?php
require 'config.php';
$db = new mysqli(DB_HOST,DB_USER,DB_PASS, DB_NAME);
if($db->connect_errno){
die('连接错误'.$db->connect_errno.': '. $db->connect_error);
}
$db->set_charset(DB_CHAR);inc/function.php
<?php
// 成功后跳转
function redirect_user($page='demo2.php')
{
// 默认值
$url = 'http://'.$_SERVER['HTTP_HOST'].dirname($_SERVER['PHP_SELF']);
// 如果有，去掉url 右侧的斜线
$url = rtrim($url, '/\\');
// 添加脚本名称
$url .= '/'.$page;
// 跳转指定地址
header('Location:'.$url);
exit();
}
function check_login($db,$name='',$password=''){
// 初始化，保存错误信息
$errors = [];
// 非空验证
if(empty($name)){
$errors[] = '名称不能为空';
} else {
$n = mysqli_real_escape_string($db,trim($name));
// $n = $name;
}
if(empty($password)){
$errors[] = '密码不能为空';
} else {
$p = mysqli_real_escape_string($db,trim($password));
// $p = $password;
}
// 到表验证
if(empty($errors)) {
$sql = "SELECT `user_id`,`email` FROM `user` WHERE `user_name` = '$n' AND `password` = sha1('$p')";
// die($sql);
$res = mysqli_query($db,$sql);
// var_dump($res);die;
if( mysqli_num_rows($res) == 1 ){
$row = mysqli_fetch_array($res,MYSQLI_ASSOC);
return [true,$row];
} else {
$errors[] = '用户名或者密码错误';
}
return [false,$errors];
}
}inc/header.php
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title> <?php echo isset($page_title) ? $page_title : '默认'; ?> </title> </head> <body> <h3>我是public</h3>
inc/footer.php
<h5>我是底部</h5> </body> </html>
demo2.php
<?php
// 首页
$page_title = '首页';
// 头部
include 'inc/header.php';
if(isset($_COOKIE['user_id']) && basename($_SERVER['PHP_SELF']) !='login.php'){
echo '<a href="loginout.php">退出</a><br>';
} else{
echo '<a href="islogin.php">登录</a><br>';
}
// 底部
include 'inc/footer.php';home.php
<?php
// 登录成功
if(!isset($_COOKIE['user_id'])){
require './inc/function.php';
redirect_user();
}
$page_title = 'home';
include 'inc/header.php';
echo <<< HOME
<h3>welcome</h3>
<p>user_id：{$_COOKIE['user_id']}</p>
<p>email：{$_COOKIE['email']}</p>
<p><a href='loginout.php'>退出</a></p>
HOME;
include 'inc/footer.php';isLogin.php
<?php
// 登录页
// require './inc/db.php';
// require './inc/function.php';
// 请求判断
if($_SERVER['REQUEST_METHOD'] == 'POST'){
require './inc/db.php';
require './inc/function.php';
list($check,$data) = check_login($db,$_POST['name'],$_POST['password']);
// check_login($db,'admin','123456');
if($check){
// 设置cookie
setcookie('user_id',$data['user_id']);
setcookie('email',$data['email']);
// 跳转
redirect_user('home.php');
} else {
$errors = $data;
}
// 关闭数据库
$db = null;
}
include 'login.php';login.php
<?php
// 登录模板
$page_title = 'login';
include 'inc/header.php';
// 错误信息
if(isset($errors) && !empty($errors)){
$error_msg = '<div>';
foreach($errors as $msg) {
$error_msg .= $msg . '<br>';
}
echo $error_msg."</div>";
}
?>
<h4>用户登录</h4>
<form action="islogin.php" method='post'>
<p>
<label for="name">姓名</label>
<input type="text" name='name' id='name'
value="<?php echo isset($_POST['name']) ? $_POST['name'] : ''; ?>"
>
</p>
<p>
<label for="password">手机号</label>
<input type="password" name='password' id='password'
value="<?php echo isset($_POST['password']) ? $_POST['password'] : ''; ?>"
>
</p>
<p>
<button type='submit'>提交</button>
</p>
</form>
<?php
include 'inc/footer.php';
?>loginout.php
<?php
// 退出页
if(!isset($_COOKIE['user_id'])){
require './inc/function.php';
redirect_user();
} else {
setcookie('user_id','',time()-3600);
setcookie('email','',time()-3600);
}
$page_title = '退出';
include 'inc/header.php';
echo <<< HOME
<h3>exit</h3>
<hr>
<p><a href='islogin.php'>登陆</a></p>
HOME;
include 'inc/footer.php';Session
inc文件里的跟Cookie一样
demo2.php
<?php
// 首页
// 启动会话
session_start();
$page_title = '首页';
// 头部
include 'inc/header.php';
if(isset($_SESSION['user_id']) && basename($_SERVER['PHP_SELF']) !='islogin.php'){
echo '<a href="loginout.php">退出</a><br>';
} else{
echo '<a href="islogin.php">登录</a><br>';
}
// 底部
include 'inc/footer.php';home.php
<?php
// 登录成功
// 启动会话
session_start();
if(!isset($_SESSION['user_id'])){
require './inc/function.php';
redirect_user();
}
$page_title = 'home';
include 'inc/header.php';
echo <<< HOME
<h3>welcome</h3>
<p>user_id：{$_SESSION['user_id']}</p>
<p>email：{$_SESSION['email']}</p>
<p><a href='loginout.php'>退出</a></p>
HOME;
include 'inc/footer.php';isLogin.php
<?php
// 登录页
// 启动会话
session_start();
// 请求判断
if($_SERVER['REQUEST_METHOD'] == 'POST'){
require './inc/db.php';
require './inc/function.php';
list($check,$data) = check_login($db,$_POST['name'],$_POST['password']);
// check_login($db,'admin','123456');
if($check){
// 设置cookie
// setcookie('user_id',$data['user_id']);
// setcookie('email',$data['email']);
$_SESSION['user_id'] = $data['user_id'];
$_SESSION['email'] = $data['email'];
// 跳转
redirect_user('home.php');
} else {
$errors = $data;
}
// 关闭数据库
$db = null;
}
include 'login.php';login.php
<?php
// 登录模板
$page_title = 'login';
include 'inc/header.php';
// 错误信息
if(isset($errors) && !empty($errors)){
$error_msg = '<div>';
foreach($errors as $msg) {
$error_msg .= $msg . '<br>';
}
echo $error_msg."</div>";
}
?>
<h4>用户登录</h4>
<form action="islogin.php" method='post'>
<p>
<label for="name">姓名</label>
<input type="text" name='name' id='name'
value="<?php echo isset($_POST['name']) ? $_POST['name'] : ''; ?>"
>
</p>
<p>
<label for="password">手机号</label>
<input type="password" name='password' id='password'
value="<?php echo isset($_POST['password']) ? $_POST['password'] : ''; ?>"
>
</p>
<p>
<button type='submit'>提交</button>
</p>
</form>
<?php
include 'inc/footer.php';
?>loginout.php
<?php
// 退出页
// 启动会话
session_start();
if(!isset($_SESSION['user_id'])){
require './inc/function.php';
redirect_user();
} else {
// setcookie('user_id','',time()-3600);
// setcookie('email','',time()-3600);
session_destroy();
setcookie('PHPSESSID','',time()-36000);
}
$page_title = '退出';
include 'inc/header.php';
echo <<< HOME
<h3>exit</h3>
<hr>
<p><a href='islogin.php'>登陆</a></p>
HOME;
include 'inc/footer.php';总结
通过cookie与session会话机制的练习，体验一番client与server的简单交互过程，确实有趣的存储识别方式。
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