今天小编给大家分享一下php代码如何实现成绩查询的相关知识点，内容详细，逻辑清晰，相信大部分人都还太了解这方面的知识，所以分享这篇文章给大家参考一下，希望大家阅读完这篇文章后有所收获，下面我们一起来了解一下吧。
php代码实现成绩查询的方法：1、创建前端登录页面代码；2、通过“if (isset($_SESSION['username'])) {...}”语法实现判断用户是否登录；3、创建后端管理登录页面；4、连接数据库；5、通过“session_start(); if (isset($_COOKIE['username'])) {$_SESSION['']}”代码实现查询成绩即可。
PHP成绩查询系统
一个非常简陋的PHP成绩查询系统，期末作业。
因为上课打酱油了，所以这也是最后几天捣鼓出来的，代码都是东拼西凑的，只有简单的增删改查功能。就酱紫。
数据库：
一共这么几个文件（html、css、php都写一块了）
然后界面：（就长这样）
代码是按上图的文件顺序排的
<!DOCTYPE html><html><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: 0px; padding: auto; } fieldset { margin: auto; margin-top: 200px; width: 400px; text-align: center; } ul li { margin: 0; padding: 0; } form { margin: 40px 30px 0; } form li { list-style: none; padding: 5px 0; } .login_btn { border: none; background: #01A4F1; color: #fff; font-size: 14px; font-weight: bold; height: 28px; line-height: 28px; padding: 0 10px; cursor: pointer; } a:link { text-decoration: none; color: blue; } a:visited { color: blue; text-decoration: none; } .return_but { float: right; } </style></head><body> <form action="#" method="POST"> <fieldset> <legend>添加学生成绩</legend> <ul> <li> 请输入学生的<b>成绩</b> <span><a href="show_teacher.php">返回</a></span> </li> <li> 学号: <input type="text" name="username" /> </li> <li> 语文: <input type="text" name="yuwen" /> </li> <li> 数学: <input type="text" name="shuxue" /> </li> <li> 英语: <input type="text" name="yingyu" /> </li> <li> 综合: <input type="text" name="zonghe" /> </li> <li> <input type="submit" name="add_score" value="确认添加" /> </li> </ul> </fieldset> </form> <?php header("Content-Type:text/html; charset=utf-8"); session_start(); include("conn.php"); $con = mysqli_connect("localhost:3306", "root", "", "resultsquerysystem"); mysqli_query($con, "set names utf8"); if (isset($_SESSION['username'])) { if (isset($_POST['add_score'])) { $username = $_POST['username']; $yuwen = $_POST['yuwen']; $shuxue = $_POST['shuxue']; $yingyu = $_POST['yingyu']; $zonghe = $_POST['zonghe']; $sql = "insert into score (username,语文,数学,英语,综合) values('$username','$yuwen','$shuxue','$yingyu','$zonghe')"; mysqli_query($con, $sql); if (mysqli_affected_rows($con) > 0) { echo "<script> alert('添加成功'); location.href='show_teacher.php';</script>"; } } } else { //缓存意外被清除后、 echo "用户信息丢失，3秒后返回登陆界面"; header('refresh: 3; url=index.php'); } ?></body></html><!DOCTYPE html><html><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: 0px; padding: auto; } fieldset { margin: auto; margin-top: 200px; width: 400px; text-align: center; } ul li { margin: 0; padding: 0; } form { margin: 40px 30px 0; } form li { list-style: none; padding: 5px 0; } .login_btn { border: none; background: #01A4F1; color: #fff; font-size: 14px; font-weight: bold; height: 28px; line-height: 28px; padding: 0 10px; cursor: pointer; } a:link { text-decoration: none; color: blue; } a:visited { color: blue; text-decoration: none; } .return_but { float: right; } </style></head><body> <form action="#" method="POST"> <fieldset> <legend>添加学生信息</legend> <ul> <li> 请输入需要添加学生的<b>学号</b>和<b>登陆密码</b> <span><a href="show_teacher.php">返回</a></span> </li> <li> 学号: <input type="text" name="username" /> </li> <li> 密码: <input type="password" name="password" /> </li> <li> <input type="submit" name="add_student" value="确认添加" /> </li> </ul> </fieldset> </form> <?php header("Content-Type:text/html; charset=utf-8"); session_start(); include("conn.php"); $con = mysqli_connect("localhost:3306", "root", "", "resultsquerysystem"); mysqli_query($con, "set names utf8"); if (isset($_SESSION['username'])) { if (isset($_POST['add_student'])) { $username = $_POST['username']; $password = $_POST['password']; $sql = "insert into student (username,password) values('$username','$password')"; mysqli_query($con, $sql); if (mysqli_affected_rows($con) > 0) { echo "<script> alert('添加成功'); location.href='show_teacher.php';</script>"; } } } else { //缓存意外被清除后、 echo "用户信息丢失，3秒后返回登陆界面"; header('refresh: 3; url=index.php'); } ?></body></html><!DOCTYPE html><html><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: 0px; padding: auto; } fieldset { margin: auto; margin-top: 200px; width: 400px; text-align: center; } ul li { margin: 0; padding: 0; } form { margin: 40px 30px 0; } form li { list-style: none; padding: 5px 0; } .login_btn { border: none; background: #01A4F1; color: #fff; font-size: 14px; font-weight: bold; height: 28px; line-height: 28px; padding: 0 10px; cursor: pointer; } a:link { text-decoration: none; color: blue; } a:visited { color: blue; text-decoration: none; } .return_but { float: right; } </style></head><body> <form action="#" method="POST"> <fieldset> <legend>修改学生成绩</legend> <ul> <li> 学号：<?php echo $_GET['username'] ?> <span><a href="show_teacher.php">返回</a></span> </li> <li> 语文: <input type="text" name="yuwen" value="<?php echo $_GET['yuwen'] ?>" /> </li> <li> 数学: <input type="text" name="shuxue" value="<?php echo $_GET['shuxue'] ?>" /> </li> <li> 英语: <input type="text" name="yingyu" value="<?php echo $_GET['yingyu'] ?>" /> </li> <li> 综合: <input type="text" name="zonghe" value="<?php echo $_GET['zonghe'] ?>" /> </li> <li> <input type="submit" name="alter_score" value="确认修改" /> </li> </ul> </fieldset> </form> <?php header("Content-Type:text/html; charset=utf-8"); session_start(); include("conn.php"); $con = mysqli_connect("localhost:3306", "root", "", "resultsquerysystem"); mysqli_query($con, "set names utf8"); if (isset($_SESSION['username'])) { if (isset($_POST['alter_score'])) { $username = $_GET['username']; $yuwen = $_POST['yuwen']; $shuxue = $_POST['shuxue']; $yingyu = $_POST['yingyu']; $zonghe = $_POST['zonghe']; $sql = "UPDATE `score` SET`语文`=$yuwen,`数学`=$shuxue,`英语`=$yingyu,`综合`=$zonghe WHERE username = $username"; mysqli_query($con, $sql); if (mysqli_affected_rows($con) > 0) { echo "<script> alert('修改成功'); location.href='show_teacher.php';</script>"; } } } else { //缓存意外被清除后、 echo "用户信息丢失，3秒后返回登陆界面"; header('refresh: 3; url=index.php'); } ?></body></html><!DOCTYPE html><html><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></head><body><?php$con =mysqli_connect("localhost:3306","root","","miniblog"); if(!$con){die("链接错误"); } mysqli_query($con,"set names utf8");?></body></html><!DOCTYPE html><html><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></head><body> <?php header("Content-Type:text/html; charset=utf-8"); session_start(); include("conn.php"); $con = mysqli_connect("localhost:3306", "root", "", "resultsquerysystem"); mysqli_query($con, "set names utf8"); if (isset($_SESSION['username'])) { if (isset($_GET['id'])) { $username = $_GET['id']; echo $username; $sql = "delete from score where username = $username"; mysqli_query($con, $sql); if (mysqli_affected_rows($con) > 0) { echo "<script> alert('删除成功'); location.href='show_teacher.php';</script>"; } } } else { //缓存意外被清除后、 echo "用户信息丢失，3秒后返回登陆界面"; header('refresh: 3; url=index.php'); } ?></body></html><!DOCTYPE html><html><head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <style> * { margin: 0px; padding: auto; } fieldset { margin: auto; margin-top: 200px; width: 400px; text-align: center; } ul li { margin: 0; padding: 0; } form { margin: 40px 30px 0; } form li { list-style: none; padding: 5px 0; } .login_btn { border: none; background: #01A4F1; color: #fff; font-size: 14px; font-weight: bold; height: 28px; line-height: 28px; padding: 0 10px; cursor: pointer; } </style></head><body> <form action="#" method="POST"> <fieldset> <legend>用户登录</legend> <ul> <li> 用户名: <input type="text" name="username" /> </li> <li> 密 码: <input type="password" name="password" /> </li> <li> <input type="submit" name="login_student" value="学生登录" /> <input type="submit" name="login_teacher" value="教师登录" /> </li> </ul> <?php header("Content-Type:text/html;charset=utf-8"); include("conn.php"); $con = mysqli_connect("localhost:3306", "root", "", "resultsquerysystem"); session_start(); //点击学生登陆按钮 if (isset($_POST['login_student'])) { $username = trim($_POST['username']); $password = trim($_POST['password']); if (($username == '') || ($password == '')) { header('refresh: 3; url=index.php'); echo "该用户名或者密码不能为空,3秒后跳转到登录页面"; exit; } else { $sql = "select * from student where username='$username'"; $res = mysqli_query($con, $sql); $n = mysqli_num_rows($res); if ($n > 0) { $row = mysqli_fetch_assoc($res); $pwd = $row['password']; //用户名或密码错误 if ($password != $pwd) { # code... header('refresh: 3; url=index.php'); echo "用户名或者密码错误,3秒后跳转到登录页面"; } else { //登录成功,将用户信息保存到session中 $_SESSION['username'] = $username; $_SESSION['islogin'] = 1; //用户信息保存到Cookie ，1天 setcookie("username", $username, time() + 24 * 60 * 60); setcookie( "pw", md5($username . md5($password)), time() + 24 * 60 * 60 ); //跳转到显示页面 header("location:show_student.php"); } } else { header('refresh: 3; url=index.php'); echo "用户名或者密码错误,3秒后跳转到登录页面"; } } } //点击教师登录按钮 elseif (isset($_POST['login_teacher'])) { $username = trim($_POST['username']); $password = trim($_POST['password']); if (($username == '') || ($password == '')) { header('refresh: 3; url=index.php'); echo "该用户名或者密码不能为空,3秒后跳转到登录页面"; exit; } else { $sql = "select * from teacher where username='$username'"; $res = mysqli_query($con, $sql); $n = mysqli_num_rows($res); if ($n > 0) { $row = mysqli_fetch_assoc($res); $pwd = $row['password']; //用户名或密码错误 if ($password != $pwd) { # code... header('refresh: 3; url=index.php'); echo "用户名或者密码错误,3秒后跳转到登录页面"; } else { //登录成功,将用户信息保存到session中 $_SESSION['username'] = $username; $_SESSION['islogin'] = 1; //用户信息保存到Cookie ，1天 setcookie("username", $username, time() + 24 * 60 * 60); setcookie( "pw", md5($username . md5($password)), time() + 24 * 60 * 60 ); //跳转到显示页面 header("location:show_teacher.php"); } } else { header('refresh: 3; url=index.php'); echo "用户名或者密码错误,3秒后跳转到登录页面"; } } } ?> </fieldset> </form></body></html><!DOCTYPE html><html><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> a:link { text-decoration: none; color: blue; } a:visited { color: blue; text-decoration: none; } </style></head><body> <?php header("Content-Type:text/html;charset=utf-8"); session_start(); //清除session $username = $_SESSION['username']; $_SESSION = array(); session_destroy(); //清除cookie setcookie("username", '', time() - 1); setcookie("code", '', time() - 1); echo "<a href='index.php'>点击重新登录</a>"; header('refresh: 5; url=index.php'); echo "<br />5秒钟后自动返回到主页"; ?></body></html><!DOCTYPE html><html><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> * { margin: 0px; padding: auto; } a:link { text-decoration: none; color: blue; } a:visited { color: blue; text-decoration: none; } #box { margin: auto; margin-top: 200px; width: 800px; text-align: center; } table { width: 700px; padding: 0; margin: 0 auto; } td { border-right: 1px solid #C1DAD7; border-bottom: 1px solid #C1DAD7; font-size: 11px; padding: 6px 6px 6px 12px; color: #4f6b72; } tr:hover { background-color: #B0C4DE; } th { font: bold 11px "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif; color: #4f6b72; border-right: 1px solid #C1DAD7; border-bottom: 1px solid #C1DAD7; border-top: 1px solid #C1DAD7; letter-spacing: 2px; text-transform: uppercase; text-align: center; padding: 6px 6px 6px 12px; background: #CAE8EA no-repeat; } </style></head><body> <div id="box"> <?php header("Content-Type:text/html;charset=utf-8"); session_start(); //首先判断Cookie是否有记住用户信息 if (isset($_COOKIE['username'])) { $_SESSION['username'] = $_COOKIE['username']; $_SESSION['islogin'] = 1; } if (isset($_SESSION['islogin'])) { //已经登录 echo "成绩查询中心！<br/><br/>你的学号：" . $_SESSION['username'] . " "; echo "<a href='logout.php'>注销</a>"; } else { //为登录 echo "你还未登录，请<a href='index.php'>登录</a>"; } ?> <table> <thead> <th>语文</th> <th>数学</th> <th>英语</th> <th>综合</th> </thead> <?php $db = new mysqli("localhost", "root", "", "resultsquerysystem"); $sql = "select * from score where username = '" . $_SESSION['username'] . "'"; $r = $db->query($sql); //传值 while ($attr = $r->fetch_row()) { echo " <tr> <td>{$attr[1]}</td> <td>{$attr[2]}</td> <td>{$attr[3]}</td> <td>{$attr[4]}</td> </tr>"; } ?> </table> </div></body></html><!DOCTYPE html><html><head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <style> a:link { text-decoration: none; color: blue; } a:visited { color: blue; text-decoration: none; } * { margin: 0px; padding: auto; } #box { margin: auto; margin-top: 200px; width: 800px; text-align: center; } table { width: 700px; padding: 0; margin: 20px auto; } td { border-right: 1px solid #C1DAD7; border-bottom: 1px solid #C1DAD7; font-size: 11px; padding: 6px 6px 6px 12px; color: #4f6b72; } tr:hover { background-color: #B0C4DE; } th { font: bold 11px "Trebuchet MS", Verdana, Arial, Helvetica, sans-serif; color: #4f6b72; border-right: 1px solid #C1DAD7; border-bottom: 1px solid #C1DAD7; border-top: 1px solid #C1DAD7; letter-spacing: 2px; text-transform: uppercase; text-align: center; padding: 6px 6px 6px 12px; background: #CAE8EA no-repeat; } .login_btn { border: none; background: #01A4F1; color: #fff; font-size: 14px; font-weight: bold; height: 28px; line-height: 28px; padding: 0 10px; cursor: pointer; } </style></head><body> <div id="box"> <?php header("Content-Type:text/html;charset=utf-8"); session_start(); //首先判断Cookie是否有记住用户信息 if (isset($_COOKIE['username'])) { $_SESSION['username'] = $_COOKIE['username']; $_SESSION['islogin'] = 1; } if (isset($_SESSION['islogin'])) { //已经登录 echo "成绩查询中心！<br/><br/>工号：" . $_SESSION['username'] . " "; echo "<a href='logout.php'>注销</a>"; } else { //为登录 echo "你还未登录，请<a href='index.php'>登录</a>"; } ?> <form method="post" action="delete_score.php"> <table> <thead> <th>学号</th> <th>语文</th> <th>数学</th> <th>英语</th> <th>综合</th> <th>操作</th> </thead> <?php $db = new mysqli("localhost", "root", "", "resultsquerysystem"); $sql = "select * from score"; $r = $db->query($sql); //传值 while ($attr = $r->fetch_row()) { echo " <tr> <td>{$attr[0]}</td> <td>{$attr[1]}</td> <td>{$attr[2]}</td> <td>{$attr[3]}</td> <td>{$attr[4]}</td> <td> <a href='alter_score.php?username=$attr[0]&yuwen=$attr[1]&shuxue=$attr[2]&yingyu=$attr[3]&zonghe=$attr[4]'>修改</a> <a href='delete_score.php?id=$attr[0]'>删除</a> </td> </tr>"; } ?> </table> </form> <a href="add_student.php"><button>添加学生信息</button></a> <a href="add_score.php"><button>添加学生成绩</button></a> </div></body></html>
以上就是“php代码如何实现成绩查询”这篇文章的所有内容，感谢各位的阅读！相信大家阅读完这篇文章都有很大的收获，小编每天都会为大家更新不同的知识，如果还想学习更多的知识，请关注编程网行业资讯频道。
