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1月14日 学号：478291 cookie与session
Lin__
Original
650 people have browsed it
  • 数据保存在客户端浏览器上，如果浏览器关闭cookie，则无法使用
  • 创建cookie：setcookie(名称,值,[过期时间])
  • 使用cookie：$_COOKIE['名称']
  • 删除cookie：为cookie设置一个已经过期的时间，如：setcookie(名称,值,time()-1)
  • 使用cookie完成用户登录：

index.php

  1. <?php include 'config.php'; ?>
  2. <!DOCTYPE html>
  3. <html>
  4.     <head>
  5.         <meta charset="utf-8">
  6.         <title></title>
  7.         <link rel="stylesheet" href="css/public-header.css">
  8.         <link rel="stylesheet" href="css/public_style.css">
  9.     </head>
  10.     <body>
  11.         <!-- 头部 -->
  12.         <div class="public-header">
  13.             <!-- 左侧导航 -->
  14.             <div class="left-link">
  15.                 <?php foreach($nav as $item): ?>
  16.                     <a href="<?php echo $item['url']?>"><?php echo $item['name']; ?></a>
  17.                 <?php endforeach; ?>
  18.             </div>
  19.             <!-- 左侧导航 end -->
  20.             <!-- 右侧按钮 -->
  21.             <div class="right-link">
  22.                 <?php if(!isset($_COOKIE['user'])): ?>
  23.                 <!-- 用户登录 -->
  24.                 <a href="login.php">
  25.                     <i class="iconfont icon-huiyuan2"></i>用户登录
  26.                 </a>
  27.                 <!-- 免费注册 -->
  28.                 <a href="#">免费注册</a>
  29.                 <?php else: ?>
  30.                 <a href="#"><?php echo $_COOKIE['user']; ?></a>
  31.                 <a href="handle.php?action=logout">退出登录</a>
  32.                 <?php endif; ?>
  33.             </div>
  34.             <!-- 右侧按钮 end -->
  35.         </div>
  36.         <!-- 头部 end -->
  37.     </body>
  38. </html>

login.php

  1. <?php 
  2.     if(filter_has_var(INPUT_COOKIE,'user')){
  3.         die('已登录，请勿重复登录');
  4.     }
  5.  ?>
  6. <!doctype html>
  7. <html>
  8. <head>
  9.     <meta charset="utf-8">
  10.     <title>用户登录</title>
  11.     <style>
  12.         form{
  13.             width: 400px;
  14.             height: 200px;
  15.             background-color: #0cbadf;
  16.             border-radius: 5px;
  17.             text-align: center;
  18.             margin: auto;
  19.         }
  20.         form > div{
  21.             display: grid;
  22.             grid-template-columns: 100px 200px;
  23.             margin: 20px 0;
  24.             grid-column-gap:10px;
  25.         }
  26.         form > div > label{
  27.             text-align: right;
  28.         }
  29.         form > div > input{
  30.             border-radius: 5px;
  31.         }
  32.     </style>
  33. </head>
  34. <body>
  35. <form action="handle.php?action=login" method="post">
  36.     <h3>用户登录</h3>
  37.     <div>
  38.         <label for="username">用户名</label>
  39.         <input type="text" name="username" id="username" required autofocus>
  40.     </div>
  41.     <div>
  42.         <label for="password">密码</label>
  43.         <input type="password" name="password" id="password" required autofocus>
  44.     </div>
  45.     <input type="submit" value="登录">
  46. </form>
  47. </body>
  48. </html>

handle.php

  1. <?php
  2. $user=[
  3.     ['username'=>'admin','password'=>'21232f297a57a5a743894a0e4a801fc3']
  4. ];
  6. $from_page=basename(filter_input(INPUT_SERVER,'HTTP_REFERER'));
  7. $pages_arr=['index.php','login.php'];
  9. if(!in_array($from_page,$pages_arr)){
  10.     die('非法来源');
  11. }
  13. $action=filter_input(INPUT_GET,'action',FILTER_SANITIZE_STRING);
  14. switch($action){
  15.     case 'login':
  16.         $username=filter_input(INPUT_POST,'username',FILTER_SANITIZE_STRING);
  17.         $password=filter_input(INPUT_POST,'password',FILTER_SANITIZE_STRING);
  18.         if(!$username){
  19.             die('请输入用户名');
  20.         }
  21.         $i=0;
  22.         foreach($user as $item){
  23.             if(in_array($username,$item)){
  24.                 $user_password=$item['password'];
  25.                 break;
  26.             }else{
  27.                 $i++;
  28.             }
  29.         }
  30.         if($i>=count($user)){
  31.             die('该用户未注册');
  32.         }
  33.         if(MD5($password)!=$user_password){
  34.             die('密码不正确');
  35.         }else{
  36.             setcookie('user',$username);
  37.             echo '<script>alert("登录成功！");window.location.href="index.php";</script>';
  38.         }
  39.         break;
  40.     case 'logout':
  41.         setcookie('user',$username,time()-1);
  42.         echo '<script>alert("退出登录成功！");window.location.href="index.php";</script>';
  43.     break;
  44. }

session

  • 数据保存在服务器上
  • 启动session：session_start()
  • 创建session：$_SESSION['名称']=值
  • 使用session：$_SESSION['名称']
  • 删除单个session：unset($_SESSION['名称'])
  • 删除所有的session：session_unset()
  • 销毁session：session_destory()

index.php

  1. <?php 
  2.     include 'config.php';
  3.     session_start();
  4. ?>
  5. <!DOCTYPE html>
  6. <html>
  7.     <head>
  8.         <meta charset="utf-8">
  9.         <title></title>
  10.         <link rel="stylesheet" href="css/public-header.css">
  11.         <link rel="stylesheet" href="css/public_style.css">
  12.     </head>
  13.     <body>
  14.         <!-- 头部 -->
  15.         <div class="public-header">
  16.             <!-- 左侧导航 -->
  17.             <div class="left-link">
  18.                 <?php foreach($nav as $item): ?>
  19.                     <a href="<?php echo $item['url']?>"><?php echo $item['name']; ?></a>
  20.                 <?php endforeach; ?>
  21.             </div>
  22.             <!-- 左侧导航 end -->
  23.             <!-- 右侧按钮 -->
  24.             <div class="right-link">
  25.                 <?php if(!isset($_SESSION['user'])): ?>
  26.                 <!-- 用户登录 -->
  27.                 <a href="login.php">
  28.                     <i class="iconfont icon-huiyuan2"></i>用户登录
  29.                 </a>
  30.                 <!-- 免费注册 -->
  31.                 <a href="#">免费注册</a>
  32.                 <?php else: ?>
  33.                 <a href="#"><?php echo $_SESSION['user']; ?></a>
  34.                 <a href="handle.php?action=logout">退出登录</a>
  35.                 <?php endif; ?>
  36.             </div>
  37.             <!-- 右侧按钮 end -->
  38.         </div>
  39.         <!-- 头部 end -->
  40.     </body>
  41. </html>

login.php

  1. <?php 
  2.     session_start();
  3.     if(isset($_SESSION['user'])){
  4.         die('已登录，请勿重复登录');
  5.     }
  6.  ?>
  7. <!doctype html>
  8. <html>
  9. <head>
  10.     <meta charset="utf-8">
  11.     <title>用户登录</title>
  12.     <style>
  13.         form{
  14.             width: 400px;
  15.             height: 200px;
  16.             background-color: #0cbadf;
  17.             border-radius: 5px;
  18.             text-align: center;
  19.             margin: auto;
  20.         }
  21.         form > div{
  22.             display: grid;
  23.             grid-template-columns: 100px 200px;
  24.             margin: 20px 0;
  25.             grid-column-gap:10px;
  26.         }
  27.         form > div > label{
  28.             text-align: right;
  29.         }
  30.         form > div > input{
  31.             border-radius: 5px;
  32.         }
  33.     </style>
  34. </head>
  35. <body>
  36. <form action="handle.php?action=login" method="post">
  37.     <h3>用户登录</h3>
  38.     <div>
  39.         <label for="username">用户名</label>
  40.         <input type="text" name="username" id="username" required autofocus>
  41.     </div>
  42.     <div>
  43.         <label for="password">密码</label>
  44.         <input type="password" name="password" id="password" required autofocus>
  45.     </div>
  46.     <input type="submit" value="登录">
  47. </form>
  48. </body>
  49. </html>

handle.php

  1. <?php
  2. session_start();
  3. $user=[
  4.     ['username'=>'admin','password'=>'21232f297a57a5a743894a0e4a801fc3']
  5. ];
  7. $from_page=basename(filter_input(INPUT_SERVER,'HTTP_REFERER'));
  8. $pages_arr=['index.php','login.php'];
  10. if(!in_array($from_page,$pages_arr)){
  11.     die('非法来源');
  12. }
  14. $action=filter_input(INPUT_GET,'action',FILTER_SANITIZE_STRING);
  15. switch($action){
  16.     case 'login':
  17.         $username=filter_input(INPUT_POST,'username',FILTER_SANITIZE_STRING);
  18.         $password=filter_input(INPUT_POST,'password',FILTER_SANITIZE_STRING);
  19.         if(!$username){
  20.             die('请输入用户名');
  21.         }
  22.         $i=0;
  23.         foreach($user as $item){
  24.             if(in_array($username,$item)){
  25.                 $user_password=$item['password'];
  26.                 break;
  27.             }else{
  28.                 $i++;
  29.             }
  30.         }
  31.         if($i>=count($user)){
  32.             die('该用户未注册');
  33.         }
  34.         if(MD5($password)!=$user_password){
  35.             die('密码不正确');
  36.         }else{
  37.             $_SESSION['user']=$username;
  38.             echo '<script>alert("登录成功！");window.location.href="index.php";</script>';
  39.         }
  40.         break;
  41.     case 'logout':
  42.         unset($_SESSION['user']);
  43.         echo '<script>alert("退出登录成功！");window.location.href="index.php";</script>';
  44.     break;
  45. }

运行结果



Correcting teacher：天蓬老师天蓬老师

Correction status：qualified

Teacher's comments：验证的过程 , 一定要头脑清楚...其实这些都是标准件了, 有许多现成的模块可以用,但还是有必要了解实现的细节
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