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PHP会话控制实战

首先我们先写案例一个首页(就随便写了一个导航)一个登陆页面一个注册页面

然后我们先整理一下思路

首先我们要写好表单，method,action什么的要写好。
其次我们要写一个验证脚本用来验证账号密码是否正确，登陆，退出这三个功能。

然后就是判断一下是否已经登陆，其实就这么三块。

<?php
if (filter_has_var(INPUT_COOKIE, 'user')) {
  exit('<script>alert("你已经登入了不要重复登陆噢");location.href="index.php"</script>');
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>后台登陆</title>
  <link rel="stylesheet" href="../css/bootstrap.css">
  <link rel="stylesheet" type="text/css" href="../css/login.css">
</head>
<body>
  <div class="login">
      <div class="main">
          <div class="logo">
              <strong id="logintitle">用户登陆</strong>
          </div>
          <form action="handle.php?action=login" method="post">
              <input type="text" name="username" placeholder="输入用户名" name="username">
              <hr class="hr11">
              <input type="password" name="password" placeholder="输入密码" name="password">
              <hr class="hr11">
              <button type="submit" class="btn btn-primary btn-lg btn-block">登陆</button>
              <button type="button" class="btn btn-lg btn-block btn-info" onclick="hreftz()">注册</button>
          </form>
      </div>
  </div>
</body>
<script>
  function hreftz() {
      window.location.href = "register.php";
  }
</script>
</html>

验证脚本

<?php
$users = [
  [
      'id' => 1,
      'name' => 'admin',
      'email' => 'admin@php.cn',
      'password' => '7c4a8d09ca3762af61e59520943dc26494f8941b',
  ],
  [
      'id' => 2,
      'name' => 'peter',
      'email' => 'peter@php.cn',
      'password' => '7c4a8d09ca3762af61e59520943dc26494f8941b',
  ],
];
//获取来源链接
$urlcheck = filter_input(INPUT_SERVER, 'HTTP_REFERER');
$saferules = [
  'login.php',
  'index.php',
  'register.php'
];
$url = basename($urlcheck);
if (!in_array($url, $saferules)) {
  exit('非法来源,拒绝访问！');
}
$action = filter_input(INPUT_GET, 'action', FILTER_SANITIZE_STRING);
switch ($action) {
      //登陆模块
  case 'login':
      //检查数据来源是否合法
      if (filter_input(INPUT_SERVER, 'REQUEST_METHOD') === 'POST') {
          //获取邮箱
          $username = filter_var(filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING), FILTER_VALIDATE_EMAIL);
          //获取密码
          $password = sha1(filter_input(INPUT_POST, 'password'));
          //接下来与数组进行验证
          $res = array_filter($users, function ($users) use ($username, $password) {
              return $username === $users['email'] && $password === $users['password'];
          });
          //如果$res的值是true那就是账号密码验证通过了
          if (count($res) === 1) {
              setcookie('user', serialize(array_pop($res)));
              exit('<script>alert("登陆成功");location.href="index.php"</script>');
          } else {
              exit('<script>alert("账号或者密码不正确");location.href="index.php"</script>');
          }
      } else {
          exit('提交数据非法');
      }
      break;
  case 'register':
      //通过过滤器获取用户名
      $name =filter_var(filter_input(INPUT_POST,'name'),FILTER_SANITIZE_SPECIAL_CHARS);
      //获取邮箱
      $email = filter_var(filter_input(INPUT_POST,'email',FILTER_SANITIZE_STRING),FILTER_VALIDATE_EMAIL);
      $password = sha1(filter_input(INPUT_POST,'p1'));
      $password1 = sha1(filter_input(INPUT_POST,'p2'));
      if ($password !== $password1) {
          exit('<script>alert("第一次密码输入与第二次密码输入不同");location.href="register.php"</script>');
      }
      $id=3;
      //接下来判断OK了之后应该写入数据库
      $data = compact('id','name','email','password');
      //方法一：如下; 方法二:直接 $users[]=$data;
      if(array_push($users,$data)){
          exit('<script>alert("注册成功");location.href="login.php"</script>');
      }
      break;
  case 'logout':
      if (filter_input(INPUT_COOKIE, 'user')) {
          setcookie('user', null, time() - 3600);
          exit('<script>alert("退出成功");location.href="index.php"</script>');
      }
      break;
}

验证脚本这一块,用的最多的就是那啥过滤器,filter_input，filter_var照着手册边查边打，自然而然就记住了，并且养成写注释的习惯
一般来说cookie的过期时间可以这样子设置time()-3600

Index.php页面就写个判断登陆获取一下用户名

<?php
//判断是否已经登陆
if (filter_has_var(INPUT_COOKIE, 'user')) {
  $user = unserialize(filter_input(INPUT_COOKIE, 'user'));
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <style>
      * {
          margin: 0;
          padding: 0;
      }
      nav {
          height: 35px;
          width: 100%;
          padding: 0 20px;
          box-sizing: border-box;
          background: black;
          display: flex;
          justify-content: space-between;
      }
      nav>a {
          line-height: 35px;
          text-decoration: none;
          color: white;
      }
  </style>
</head>
<body>
  <nav>
      <a href="">LOGO</a>
      <?php if (isset($user)) : ?>
          <a href="" id="logout">
              <span><?php echo $user['name'] ?></span>
              退出
          </a>
      <?php else : ?>
          <a href="login.php">登陆</a>
      <?php endif ?>
  </nav>
  <script>
      //        为退出按钮创建事件监听器
      if (document.querySelector('#logout') !== null) {
          document.querySelector('#logout').addEventListener('click', function(event) {
              if (confirm('是否退出')) {
                  // 禁用默认行为, 其实就是禁用原<a>标签的点击跳转行为,使用事件中的自定义方法处理
                  event.preventDefault();
                  // 跳转到退出事件处理器
                  window.location.assign('handle.php?action=logout');
              }
          });
      }
  </script>
</body>
</html>

顺便提一句这里的querySelector和getElementBy是有区别的querySelector是根据CSS选择器来的

register.php

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>后台登陆</title>
  <link rel="stylesheet" href="../css/bootstrap.css">
  <link rel="stylesheet" type="text/css" href="../css/login.css">
</head>
<body>
  <div class="login">
      <div class="main">
          <div class="logo">
              <strong id="logintitle">用户注册</strong>
          </div>
          <form action="handle.php?action=register" onsubmit="return compare()" method="post">
              <input type="text" placeholder="用户名" name="name">
              <hr class="hr11">
              <input type="text" placeholder="邮箱" name="email">
              <hr class="hr11">
              <input type="password" placeholder="密码" id="p1" name="password">
              <hr class="hr11">
              <input type="password" placeholder="重复密码" id="p2" name="password">
              <hr class="hr11">
              <button type="submit" class="btn btn-lg btn-block btn-info">注册</button>
              <span id="tips" style="color: red"></span>
          </form>
      </div>
  </div>
  <script>
          // 验证二次密码是否相等?
          function compare() {
              if (document.forms[0].p1.value.trim() !== document.forms[0].p2.value.trim()) {
                  document.querySelector('#tips').innerText = '二次密码不相等';
                  return false;
              }
          }
      </script>
</body>
</html>

Session

Session最重要的其实是开启sessionsession_start什么页面要用什么页面就要开启

验证脚本

<?php
session_start();
$users = [
  [
      'id' => 1,
      'name' => 'admin',
      'email' => 'admin@php.cn',
      'password' => '7c4a8d09ca3762af61e59520943dc26494f8941b',
  ],
  [
      'id' => 2,
      'name' => 'peter',
      'email' => 'peter@php.cn',
      'password' => '7c4a8d09ca3762af61e59520943dc26494f8941b',
  ],
];
//获取来源链接
$urlcheck = filter_input(INPUT_SERVER, 'HTTP_REFERER');
$saferules = [
  'login.php',
  'index.php',
  'register.php'
];
$url = basename($urlcheck);
if (!in_array($url, $saferules)) {
  exit('非法来源,拒绝访问！');
}
$action = filter_input(INPUT_GET, 'action', FILTER_SANITIZE_STRING);
switch ($action) {
      //登陆模块
  case 'login':
      //检查数据来源是否合法
      if (filter_input(INPUT_SERVER, 'REQUEST_METHOD') === 'POST') {
          //获取邮箱
          $username = filter_var(filter_input(INPUT_POST, 'username', FILTER_SANITIZE_STRING), FILTER_VALIDATE_EMAIL);
          //获取密码
          $password = sha1(filter_input(INPUT_POST, 'password'));
          //接下来与数组进行验证
          $res = array_filter($users, function ($users) use ($username, $password) {
              return $username === $users['email'] && $password === $users['password'];
          });
          //如果$res的值是true那就是账号密码验证通过了
          if (count($res) === 1) {
              $_SESSION['user'] = serialize(array_pop($res));
              exit('<script>alert("登陆成功");location.href="index.php"</script>');
          } else {
              exit('<script>alert("账号或者密码不正确");location.href="index.php"</script>');
          }
      } else {
          exit('提交数据非法');
      }
      break;
  case 'register':
      //通过过滤器获取用户名
      $name = filter_var(filter_input(INPUT_POST, 'name'), FILTER_SANITIZE_SPECIAL_CHARS);
      //获取邮箱
      $email = filter_var(filter_input(INPUT_POST, 'email', FILTER_SANITIZE_STRING), FILTER_VALIDATE_EMAIL);
      $password = sha1(filter_input(INPUT_POST, 'p1'));
      $password1 = sha1(filter_input(INPUT_POST, 'p2'));
      if ($password !== $password1) {
          exit('<script>alert("第一次密码输入与第二次密码输入不同");location.href="register.php"</script>');
      }
      $id = 3;
      //接下来判断OK了之后应该写入数据库
      $data = compact('id', 'name', 'email', 'password');
      //方法一：如下; 方法二:直接 $users[]=$data;
      if (array_push($users, $data)) {
          exit('<script>alert("注册成功");location.href="login.php"</script>');
      }
      break;
  case 'logout':
      if (isset($_SESSION['user'])) {
          session_destroy();
          exit('<script>alert("退出成功");location.href="index.php"</script>');
      }
      break;
}

Index.php核心代码

session_start();
//判断是否已经登陆
if (isset($_SESSION['user'])) {
  $user = unserialize($_SESSION['user']);
}

if (isset($_SESSION['user'])) {
  exit('<script>alert("你已经登入了不要重复登陆噢");location.href="index.php"</script>');
}

因为PHP没有关于SESSION的过滤器所以我们直接用isset就完事了

Correction status：Uncorrected

Teacher's comments：

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Author's latest blog post

2019.12.19 第一次前端作业

2019-12-20 19:45:19

PHP会话控制实战

COOKIE篇章

Login部分（不是重点）

验证脚本

Index.php页面就写个判断登陆获取一下用户名

register.php

Session

验证脚本

Index.php核心代码

Login.php

接下来是SESSION和COOKIE的理解图