How to implement score query using php code
How to implement score query using PHP code: 1. Create the front-end login page code; 2. Use the "if (isset($_SESSION['username'])) {...}" syntax to determine whether the user is Log in; 3. Create a back-end management login page; 4. Connect to the database; 5. Query results through the "session_start(); if (isset($_COOKIE['username'])) {$_SESSION['']}" code That’s it.
The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.
How to implement score query in php code?
PHP score query system
A very simple PHP score query system, final homework.
Because I was busy in class, this was also tinkered with in the last few days. The code is all pieced together, with only simple addition, deletion, modification and search functions. Just purple.
Database:
There are several files in total (html, css, php are all written together)
Then the interface: (It looks like this)
The code is as shown above The order of the files
<!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>Recommended learning: "PHP Video Tutorial"
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Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
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JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
