PHP-based student management system

Language 2023-06-05 00:34:50 views: null

foreword

PHP-based student management system;

Realize login , registration, student information, modify students, delete students, query students, add students and other functions ;

Environmental preparation

Development platform: PhpStrom2022.1.2, Phpstudy_pro

Database: MySQL5.7.26

Technology Architecture

Bootstrap +PHP7.3.4+html5+css3

project structure

page display

1. Login and registration page

2. Home page

3. Student Information

4. Modify students

5. Query students

6. Add students

7. Administrator information

8. Modify the administrator

9. Add administrator

10. Query administrator

11. Database

Notice

1. There is a difference between MySQL version 5.0 and above and 8.0 and above, and the database statement needs to be adjusted

2. Configure the MySQL database in advance before running the project

3. The functions of this system are for reference only

Student information management system code display

1. Login interface

login.html

login.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }
        body {
            background: url(images/backgroud.png);
            background-repeat: no-repeat;
            background-size: cover;
            background-attachment: fixed;
        }
        .Login {
            width: 600px;
            height: 350px;
            background: rgb(168, 196, 213);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
            border-radius: 10px;
            padding: 20px;
            box-shadow: 0 0 5px rgba(0,0,0,0.4);
        }
        label {
            display: block;
            margin-left: 10px;
        }
        form {
            margin: 25px 140px;
        }
        h2 {
            margin-top: 35px;
            text-align: center;
            font-size: 25px;
            color: #000000;
        }
        input {
            width: 220px;
            height: 30px;
            background: transparent;
            margin-top: 30px;
            border: none;
            border-bottom: 1px #a77a27 solid;
            outline: none;
            color: #000000;
            font-size: 17px;
            margin-left: 10px;
        }
        input::-webkit-input-placeholder {
            color: #c3cdd0;
        }
        button {
            width: 98px;
            height: 30px;
            border: none;
            margin-top: 55px;
            color: white;
            text-align: center;line-height: 15px;
            background-image: linear-gradient(to right, #7993d4, #ca71fa);
            border-radius: 15px;
            cursor: pointer;
        }
        button:hover {
            box-shadow: 0 0 5px rgba(0,0,0,0.4) inset;
        }
        img{
            width: 27px;
            height: 27px;
            position: relative;
            top: 9px;
        }
    </style>
</head>
<body>
<div class="Login">
    <h2 >学生管理系统</h2>
    <form action="login.php" method="post">
        <label>
            <img src="images/user.png">
            <input type="text" name="user" placeholder="请输入用户名" required>
        </label>
        <label>
            <img src="images/password.png">
            <input type="password" name="pwd" placeholder="请输入密码" required>
        </label>
        <button type="submit" value="登录">登录</button>
        <button type="button" id="btn" value="注册">注册</button>
        <button type="button" id="btn0" value="超级管理员">超管登录</button>
    </form>
</div>
<script>
   var b = document.getElementById("btn");
   b.onclick = function () {
       window.location.href="register.html"
   }
    var b0 = document.getElementById("btn0");
    b0.onclick = function () {
        window.location.href="超级管理员/adminlogin.html"
    }
</script>
</body>
</html>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<?php
header("Content-Type:text/html;charset=utf-8");
session_start();
//连接数据库
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
//设置编码
$conn->query("set names utf8");
$user = $_POST['user'];
$pwd = $_POST['pwd'];
$sql = "SELECT * FROM `admin` WHERE `name` = '{$user}' and `pwd` = '{$pwd}' ";



$stmt= $conn->query($sql);
$result = mysqli_fetch_array($stmt);

if($stmt->num_rows > 0){
    $_SESSION['user'] = $result[0];
    echo "<script>alert(\"登录成功！\")</script>";
    echo "<script>window.location.href='index.php'</script>";

}else{
    echo "<script>alert(\"账号或密码错误，请重新输入！\")</script>";
    echo "<script>window.location.href='login.html'</script>";
}

2. Registration page

register.html

register.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <style type="text/css">
        * {
            margin: 0;
            padding: 0;
        }
        body {
            background: url(images/backgroud.png) no-repeat;
        }
        .Login {
            width: 600px;
            height: 400px;
            background: rgb(232, 236, 223);
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            margin: auto;
            border-radius: 10px;
            padding: 20px;
            box-shadow: 0 0 5px rgba(0,0,0,0.4);
        }
        label {
            display: block;
            margin-left: 10px;
        }
        form {
            margin: 25px 140px;
        }
        h2 {
            margin-top: 35px;
            text-align: center;
            font-size: 25px;
            color: #000000;
        }
        input {
            width: 220px;
            height: 30px;
            background: transparent;
            margin-top: 30px;
            border: none;
            border-bottom: 1px #a77a27 solid;
            outline: none;
            color: #000000;
            font-size: 17px;
            margin-left: 10px;
        }
        input::-webkit-input-placeholder {
            color: #c3cdd0;
        }
        button {
            width: 98px;
            height: 30px;
            border: none;
            margin-top: 50px;
            margin-left: 40px;
            color: white;
            text-align: center;
            line-height: 15px;
            background-image: linear-gradient(to right, #7993d4, #ca71fa);
            border-radius: 15px;
            cursor: pointer;
        }
        button:hover {
            box-shadow: 0 0 5px rgba(0,0,0,0.4) inset;
        }
        span {
            font-size: 15px;
        }
        #btn > a{
            text-decoration: none;
        }
        img{
            width: 27px;
            height: 27px;
            position: relative;
            top: 9px;
        }
    </style>
</head>
<body>
<div class="Login">
    <h2>管理员注册</h2>
    <form action="register.php" method="post">
        <label>
            <img src="images/user.png">
            <input type="text" class="put" name="user" placeholder="请输入用户名" required>
        </label>
        <label>
            <img src="images/password.png">
            <input type="password" class="put" name="pwd1" placeholder="请输入密码" required>
        </label>
        <label>
            <img src="images/password.png">
            <input type="password" class="put" name="pwd2" placeholder="确认密码" required>
        </label>
        <button type="submit" value="提交">提交</button>
        <button type="button" id="btn" value="返回">返回</button>
    </form>
</div>
<script>
    var b = document.getElementById("btn");
    b.onclick = function () {
        window.location.href="login.html"
    }
</script>
</body>
</html>
<?php
session_start();
header("Content-Type:text/html;charset=utf-8");
//连接数据库
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
//设置编码
$conn->query("set names utf8");
$user = $_POST['user'];
$pwd1 = $_POST['pwd1'];
$pwd2 = $_POST['pwd2'];
$rows = "select `name` from `admin` where `name` = '{$user}'";
$stmt1= $conn->query($rows);
$row = mysqli_num_rows($stmt1);
if ($row == 1){
    echo "<script>alert('此用户已存在，请重新输入！')</script>";
    echo ("<script>window.location.href='register.html'</script>");
}
elseif ($pwd1 == $pwd2){
    $sql = "insert into `admin` (`name`, `pwd`) value ('{$user}','{$pwd1}')";
    $conn->query($sql);
    echo ("<script>alert('注册成功')</script>");
    echo ("<script>window.location.href='login.html'</script>");
}
else{
    echo "<script>alert('密码错误，请重新输入！')</script>";
    echo ("<script>window.location.href='register.html'</script>");
}
$conn->close();

3. Student Information

student.php

<?php
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
?>

<html>
<head>
<title>学生信息</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<!--    <link href="css/css1.css" rel="stylesheet">-->
    <link href="bootstarp/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        .btn-warning{
            background-color: #d0455a;
        }
    </style>
</head>
<body>
<?php include("header.php");?>
<div class="container">
    <br>
    <h2 style="text-align: center;color: #3db077">学生信息展示</h2>
    <br>
    <table class="table table-bordered table-hover" style="text-align: center">
        <tr class="info">
            <th>姓名</th>
            <th>学号</th>
            <th>性别</th>
            <th>手机号</th>
            <th>班级</th>
            <th>操作</th>
        </tr>
        <?php
        $sql = "select * from `student` order by `id`";
        $result = mysqli_query($conn,$sql);
        if (mysqli_num_rows($result)>0) {         // 若表中有数据
        $number = mysqli_num_rows($result);     // 取得数据笔数
        if(!isset($_GET['p']))
        {$p=0;}
        else {$p=$_GET['p'];}
        $check = $p + 8;                             // 每页抓取 8 笔数据
        for ($i = 0; $i < $number; $i++) {// 用来呈现多笔数据的循环
        $stu = mysqli_fetch_array($result);

        //选取第 $p 笔到 $check 笔数据
        if ($i >= $p && $i < $check) {
            echo "<tr>";
            echo "<td>{$stu['user']}</td>";
            echo "<td>{$stu['id']}</td>";
            echo "<td>{$stu['gender']}</td>";
            echo "<td>{$stu['phone']}</td>";
            echo "<td>{$stu['class']}</td>";
            echo "<td><a href='delete.php?id={$stu['id']}' class='btn btn-warning'>删除</a>
                      <a href='update3.php?id={$stu['id']}' class='btn btn-warning'>修改</a></td>";
            echo "</tr>";
            $j = $i+1;
            }
        }// for循环
        }
        ?>
    </table>
    <ul class="row pager" style="font-size: 16px;line-height: 30px">
        <li class="col-xs-2 col-xs-push-3">
            <!--- 将 p 值设为 0, 让模块从第一笔数据开始 ---->
            <a href="student.php?p=0">第一页</a>
        </li>
        <li class="col-xs-2 col-xs-push-2" style="margin-left: 20px">
            <?php
            if ($p>7) { // 判断是否有上一页
                $last = (floor($p/8)*8)-8;
                echo "<a href='student.php?p=$last'>上一页</a>";
            }
            else
                echo "<a class='disabled'>上一页</a>";
            ?>
        </li>
        <li class="col-xs-2 col-xs-push-1" style="margin-left: 20px">
            <?php
            if ($i>7 and $number>$check) // 判断是否有下一页
                echo "<a href='student.php?p=$j'>下一页</a>";
            else
                echo "<a class='disabled'>下一页</a>";
            ?>
        </li>
        <li class="col-xs-2" style="margin-left: 30px">
            <?php
            if ($i>7) // 判断目前呈现的笔数之后是否还有页面
            {
                // 取得最后一页的第一笔数据
                $final = floor($number/8)*8;
                echo "<a href='student.php?p=$final'>最后一页</a>";
            }
            else
                echo "<a class='disabled'>最后一页</a>";
            ?>
        </li>
    </ul>
</div>
</body>
</html>

4. Add pages

add.php

add2.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>主页</title>
    <link href="bootstarp/dist/css/bootstrap.min.css" rel="stylesheet">
    <link href="css/css1.css" rel="stylesheet">
</head>
<body>
<?php include("header.php");?>
<div class="container">
    <br>
    <h2 style="text-align: center;color: #3db077">添加学生</h2>
    <br>
<div>
    <form action="add2.php" method="post" class="form-horizontal" role="form">
        <div class="form-group">
            <label for="name" class="control-label col-xs-2">姓名</label>
            <div class="col-xs-8">
                <input id="name" type="text" name="user" class="form-control" placeholder="请输入学生的姓名" required>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label for="id" class="control-label col-xs-2">学号</label>
            <div class="col-xs-8">
                <input id="id" type="text" name="id" class="form-control" placeholder="请输入学生的学号" required>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label class="control-label col-xs-2">性别</label>
            <div class="col-xs-8">
                <label class="radio-inline"><input type="radio" value="男" name="gender" required>男</label>
                <label class="radio-inline"><input type="radio" value="女" name="gender" required>女</label>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label for="phone" class="control-label col-xs-2">手机号</label>
            <div class="col-xs-8">
                <input id="phone" type="text" name="phone" class="form-control" placeholder="请输入学生的手机号" required>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label for="class" class="control-label col-xs-2">班级</label>
            <div class="col-xs-8">
<!--                <input id="class" type="text" name="class" class="form-control" placeholder="请输入学生的班级" required>-->
                <select name="class" class="form-control">
                    <option value="1班">1班</option>
                    <option value="2班">2班</option>
                    <option value="3班">3班</option>
                    <option value="4班">4班</option>
                    <option value="5班">5班</option>
                    <option value="6班">6班</option>
                    <option value="7班">7班</option>
                    <option value="8班">8班</option>
                    <option value="9班">9班</option>
                    <option value="10班">10班</option>
                </select>
            </div>
        </div>
        <br>
        <div class="form-group">
            <div class="col-xs-2 col-xs-offset-4">
                <input style="padding: 10px 50px" class="btn btn-success" type="submit" value="提交">
            </div>
            <div class="col-xs-2">
                <input type="reset" style="padding: 10px 50px" class="btn btn-primary" value="重置">
            </div>
        </div>

    </form>
</div>
</div>
</body>
</html>





<?php
session_start();
//中文编码
header("Content-Type:text/html;charset=utf-8");
//连接数据库
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
//设置编码
$conn->query("set names utf8");
$user = $_POST['user'];
$id = $_POST['id'];
$gender = $_POST['gender'];
$phone = $_POST['phone'];
$class = $_POST['class'];

$rows = "select `id` from `student` where `id` = '{$id}'";
$stmt1= $conn->query($rows);
$row = mysqli_num_rows($stmt1);
if ($row == 1){
    echo "<script>alert('此学号已存在，请重新输入！')</script>";
    echo ("<script>window.location.href='add.php'</script>");
}else{
    $sql = "insert into `student` (`user`,`id`,`gender`,`phone`,`class`) value ('{$user}','{$id}','{$gender}','{$phone}','{$class}')";
    $stmt= $conn->query($sql);
    if ($stmt > 0){
        echo ("<script>alert('添加成功')</script>");
        echo ("<script>window.location.href='student.php'</script>");
    }else {
        echo ("<script>alert('添加失败')</script>");
        echo ("<script>window.location.href='student.php'</script>");
    }
}

$conn->close();

5. Modify the page

update.php

update2.php

update3.php

<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>主页</title>
    <link href="bootstarp/dist/css/bootstrap.min.css" rel="stylesheet">
    <link href="css/css1.css" rel="stylesheet">
</head>
<body>
<?php include("header.php");?>
<div class="container">
    <br>
    <h2 style="text-align: center;color: #3db077">学生信息修改</h2>
    <br>
<div>
    <form action="update2.php" method="post" class="form-horizontal" role="form">
        <div class="form-group">
            <label for="name" class="control-label col-xs-2">姓名</label>
            <div class="col-xs-8">
                <input id="name" type="text" name="user" class="form-control" placeholder="请输入学生的姓名" required>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label for="id" class="control-label col-xs-2">学号</label>
            <div class="col-xs-8">
                <input id="id" type="text" name="id" class="form-control" placeholder="请输入学生的学号" required>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label class="control-label col-xs-2">性别</label>
            <div class="col-xs-8">
                <label class="radio-inline"><input type="radio" value="男" name="gender" required>男</label>
                <label class="radio-inline"><input type="radio" value="女" name="gender" required>女</label>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label for="phone" class="control-label col-xs-2">手机号</label>
            <div class="col-xs-8">
                <input id="phone" type="text" name="phone" class="form-control" placeholder="请输入学生的手机号" required>
            </div>
        </div>
        <br>
        <div class="form-group">
            <label for="class" class="control-label col-xs-2">班级</label>
            <div class="col-xs-8">
<!--                <input id="class" type="text" name="class" class="form-control" placeholder="请输入学生的班级" required>-->
                <select name="class" class="form-control">
                    <option value="1">1班</option>
                    <option value="2">2班</option>
                    <option value="3">3班</option>
                    <option value="4">4班</option>
                    <option value="5">5班</option>
                    <option value="6">6班</option>
                    <option value="7">7班</option>
                    <option value="8">8班</option>
                    <option value="9">9班</option>
                    <option value="10">10班</option>
                </select>
            </div>
        </div>
        <br>
        <div class="form-group">
            <div class="col-xs-2 col-xs-offset-4">
                <input style="padding: 10px 50px" class="btn btn-success" type="submit" value="提交">
            </div>
            <div class="col-xs-2">
                <input type="reset" style="padding: 10px 50px" class="btn btn-primary" value="重置">
            </div>
        </div>
    </form>
</div>
</div>
</body>
</html>





<?php
header("Content-Type:text/html;charset=utf-8");
//连接数据库
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
//设置编码
$conn->query("set names utf8");
$user = $_POST['user'];
$id = $_POST['id'];
$gender = $_POST['gender'];
$phone = $_POST['phone'];
$class = $_POST['class'];
$rows = "select `id` from `student` where `id` = '{$id}' and `user` = '{$user}'";
$stmt1= $conn->query($rows);
$row = mysqli_num_rows($stmt1);
if ($row != 1){
    echo "<script>alert('学号不可改变，请重新输入！')</script>";
    echo ("<script>window.location.href='student.php'</script>");
}else{
    $sql = "update `student` set `user` = '{$user}',`gender` = '{$gender}',`phone` = '{$phone}',`class` = '{$class}' where `id` = '{$id}'";
    $stmt= $conn->query($sql);
    if ($stmt > 0){
        echo ("<script>alert('修改成功')</script>");
        echo ("<script>window.location.href='student.php'</script>");
    }else {
        echo ("<script>alert('修改失败')</script>");
        echo ("<script>window.location.href='student.php'</script>");
    }
}

$conn->close();

<?php
header("Content-Type:text/html;charset=utf-8");
//连接数据库
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
//设置编码
$conn->query("set names utf8");
$sql = "SELECT * FROM student WHERE id =".$_GET['id'];
$stmt = $conn->query($sql);//返回预处理对象
$stu = $stmt->fetch_array(MYSQLI_ASSOC);//返回结果集为数组
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>主页</title>
    <link href="bootstarp/dist/css/bootstrap.min.css" rel="stylesheet">
    <link href="css/css1.css" rel="stylesheet">
</head>
<body>
<?php include("header.php");?>
<div class="container">
    <br>
    <h2 style="text-align: center">学生信息修改</h2>
    <br>
    <div>
        <form action="update2.php" method="post" class="form-horizontal" role="form">
            <div class="form-group">
                <label for="user" class="control-label col-xs-2">姓名</label>
                <div class="col-xs-8">
                    <input id="user" type="text" name="user" class="form-control" value="<?php echo $stu['user']?>" placeholder="请输入学生的姓名" required>
                </div>
            </div>
            <br>
            <div class="form-group">
                <label for="id" class="control-label col-xs-2">学号</label>
                <div class="col-xs-8">
                    <input id="id" type="text" name="id" class="form-control" value="<?php echo $stu['id']?>" placeholder="请输入学生的学号" required>
                </div>
            </div>
            <br>
            <div class="form-group">
                <label class="control-label col-xs-2">性别</label>
                <div class="col-xs-8">
                    <label class="radio-inline"><input type="radio" value="男" name="gender" required>男</label>
                    <label class="radio-inline"><input type="radio" value="女" name="gender" required>女</label>
                </div>
            </div>
            <br>
            <div class="form-group">
                <label for="phone" class="control-label col-xs-2">手机号</label>
                <div class="col-xs-8">
                    <input id="phone" type="text" name="phone" class="form-control" value="<?php echo $stu['phone']?>" placeholder="请输入学生的手机号" required>
                </div>
            </div>
            <br>
            <div class="form-group">
                <label for="class" class="control-label col-xs-2">班级</label>
                <div class="col-xs-8">
<!--                    <input id="class" type="text" name="class" class="form-control" value="--><?php //echo $stu['class']?><!--" placeholder="请输入学生的班级" required>-->
                    <select name="class" class="form-control"  value="<?php echo $stu['class']?>" >
                        <option value="1班">1班</option>
                        <option value="2班">2班</option>
                        <option value="3班">3班</option>
                        <option value="4班">4班</option>
                        <option value="5班">5班</option>
                        <option value="6班">6班</option>
                        <option value="7班">7班</option>
                        <option value="8班">8班</option>
                        <option value="9班">9班</option>
                        <option value="10班">10班</option>
                    </select>
                </div>
            </div>
            <br>
            <div class="form-group">
                <div class="col-xs-2 col-xs-offset-4">
                    <input style="padding: 10px 50px" class="btn btn-success" type="submit" value="提交">
                </div>
                <div class="col-xs-2">
                    <input type="reset" style="padding: 10px 50px" class="btn btn-primary" value="重置">
                </div>
            </div>
        </form>
    </div>
</div>
</body>
</html>

6. Delete

delete.php

<?php
header("Content-Type:text/html;charset=utf-8");
//连接数据库
$conn = new mysqli("localhost", "root", "123456", "php",3316)or die("连接失败");
//设置编码
$conn->query("set names utf8");
$id = $_GET['id'];
echo $id;
$sql = "delete from `student` where `id` = '{$id}'";
$stmt= $conn->query($sql);
if ($stmt > 0){
    echo "<script>alert('删除成功')</script>";
    echo "<script>window.location.href='student.php'</script>";
}else {
    echo ("<script>alert('删除失败')</script>");
    echo ("<script>window.location.href='student.php'</script>");
}
$conn->close();

7. Query page

select.php

<?php
$conn = new mysqli("localhost", "root", "123456", "php", 3316) or die("连接失败");
?>

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <link href="css/css1.css" rel="stylesheet">
    <title>主页</title>
    <link href="bootstarp/dist/css/bootstrap.min.css" rel="stylesheet">
    <style type="text/css">
        th {
            text-align: center;
        }

        label {
            font-size: 17px;
        }
    </style>
</head>
<?php include("header.php");?>
<div class="container">
    <br>
    <h2 style="text-align: center;color: #3db077">学生信息查询</h2>
    <br>
    <form method="get" action="#" class="form-horizontal" role="form">
        <div class="form-group">
            <label for="name" class="control-label col-xs-2 col-xs-offset-2">请输入要查询的姓名</label>
            <div class="col-xs-4">
                <input id="name" type="text" name="user" class="form-control" placeholder="请输入姓名">
            </div>
            <input style="padding: 7px 30px;border-radius: 5px;border: none" class="col-xs-1 btn-success" type="submit"
                   name="select" value="查询">
        </div>
    </form>
    <table class="table table-bordered table-hover" style="margin-top: 30px; text-align: center">
        <tr class="info">
            <th>姓名</th>
            <th>学号</th>
            <th>性别</th>
            <th>手机号</th>
            <th>班级</th>
        </tr>
        <?php
        //名字模糊查询
        if (isset($_GET['select'])) {
            $user = $_GET['user'];
            $sql = "select * from student where student.user like '%$user%'";
            $result = $conn->query($sql);
            while ($row = $result->fetch_assoc()) {
                echo "<tr>";
                echo "<td>" . $row['user'] . "</td>";
                echo "<td>" . $row['id'] . "</td>";
                echo "<td>" . $row['gender'] . "</td>";
                echo "<td>" . $row['phone'] . "</td>";
                echo "<td>" . $row['class'] . "</td>";
                echo "</tr>";
            }
        }
        ?>
    </table>
</div>
</body>
</html>

Eight, the header code

header.php

<?php
$conn = new mysqli("localhost", "root", "123456", "php", 3316) or die("连接失败");
session_start();
?>

<html>
<head>
    <title>主页</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <link href="css/css1.css" rel="stylesheet">
    <link href="bootstarp/dist/css/bootstrap.min.css" rel="stylesheet">
    <style>
        button {
            top: 7px;
            right: 15px;
        }

        th {
            text-align: center;
        }

        .container {
            width: 1200px;
        }

        .row {
            line-height: 50px;
        }

        .btn-warning {
            background-color: #d0455a;
        }

        body {
            background-image: url("images/backgroud.png");
            background-repeat: no-repeat;
            background-size: cover;
            background-attachment: fixed;
        }
    </style>
</head>
<body>
<div class="container">
    <div class="row" style="background-color: #2e7ad5;color: white">
        <div style="font-size: 20px" class="col-xs-3">学生管理系统</div>
        <a href="index.php"><span class="col-xs-1">首页</span></a>
        <a href="student.php"><span class="col-xs-1">学生信息</span></a>
        <a href="update.php"><span class="col-xs-1">修改学生</span></a>
        <a href="select.php"><span class="col-xs-1">查询学生</span></a>
        <a href="add.php"><span class="col-xs-1">添加学生</span></a>
        <span style="left: 60px" class="col-xs-2 col-xs-offset-1">管理员：<?php echo $_SESSION['user'] ?></span>
        <a href="login.html">
            <button class="col-xs-1 btn btn-danger">退出</button>
        </a>
    </div>
</div>
</body>
</html>

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