Backend Development
PHP Tutorial
Detailed introduction to the code for implementing the message board function in PHP
Detailed introduction to the code for implementing the message board function in PHP
This small message board function is suitable for discussions, conversations and messages within the class or within the company. It is very convenient. More importantly, it does not require an Internet connection. It is very common for company management.
The following is how this message board is written:
1 First is the login page:
<form action="chuli.php" method="post">
<p style="margin-left: 500px; margin-top: 200px;
height: 250px; width: 250px">/*为了把登录表放到页面中间，比较美观*/
<h1>公司内部留言板</h1>
<p style="margin-top: 20px">用户名：<input type="text" name="username"/></p><br/>
<p>密 码：<input type="password" name="password"/></p><br/>
<p><input type="submit" value="登录"/></p>
</p>
</form>2 After the login page is completed, you need to enter the login processing page, which is the chuli submitted above .php
<?php
session_start(); // 登录之后要把所包含登录的页面连接起来，开启session
include("DADB.class.php");
$db=new DADB();
$user=$_POST["username"];
$pwd=$_POST["password"];
$sql="select password from yuangong where username='{$user}'";
$arr=$db->Query($sql);
if($arr[0][0]==$pwd && !empty($pwd))
{
$_SESSION["username"]=$user;
header("location:main.php");
}
else
{
echo"登录失败";
}
?>As shown in the picture, it is the login page
3. After the login is completed, you will enter the main page, which displays the dialogue content you received. The following is the design The code of the database table and the main page:
<body>
<p><h3><a href="fabu.php">发布信息</a>
<a href="tuichu.php">退出系统</a></h3> </p>
<br/><br/>
<h2>留言信息：</h2>
<table cellpadding="0" cellspacing="0" border="1" width="60%">
<tr>
<td>发送人</td>
<td>接收人</td>
<td>发送时间</td>
<td>信息内容</td>
</tr>
<?php
session_start();
if(empty($_SESSION["username"]))
{
header("location:login.php");
}
$user=$_SESSION["username"];
include("DADB.class.php");
$db=new DADB();
$sql="select * from liuyan where recever='$user' or recever='all' ";
$arr=$db->Query($sql);
foreach($arr as $v)
{ $fjr=uname($v[1]);
$jsr=uname($v[2]);
echo"<tr>
<td>{$fjr}</td> //发送人和接收人要用到姓名，所以这里我们调用了一个方法
<td>{$jsr}</td>
<td>{$v[3]}</td>
<td>{$v[4]}</td>
</tr>";
}
function uname($user) //运用了uname方法
{
global $db; //要想方法里面也可以用$db 这里用了全局变量
if($user=="all")
{
return "所有人";
}else
{
$sql1="select name from yuangong where username='{$user}'";
$att=$db->Query($sql1);
return $att[0][0];}
}
?>
</table>
</body>4 The code is written here, the more important part is completed, the next step is to enter the release The information page is equivalent to the added page written before, and its processing page is no different from before. The difference is that the current processing page is operated when the user is logged in, and you need to use session to process all logged in pages. Connect
##
<h1>发布信息</h1>
<a href="main.php">主页面</a>
<br />
<br />
<?php
session_start();
if(empty($_SESSION["username"]))
{
header("location:login.php");
exit;
}
$user = $_SESSION["username"];
include("DADB.class.php");
$db = new DADB();
$shaoyou = "select * from firend where me='{$user}'";
$ahaoyou = $db->Query($shaoyou);
?>
<form action="fabuchuli.php" method="post">
<p>接收人：
<select name="jsr">
<option value="all">所有人</option>
<?php
foreach($ahaoyou as $v)
{
$name = uname($v[2]);
echo "<option value='{$v[2]}'>{$name}</option>";
}
?>
</select>
</p>
<br />
<p>
信息内容：<textarea name="neirong"></textarea>
</p><br />
<input type="submit" value="发送" />
</form>
<?php
function uname($user)
{
global $db;
if($user=="all")
{
return "所有人";
}
else
{
$sql1 = "select name from yuangong where username='{$user}'";
$att = $db->Query($sql1);
return $att[0][0];
}
}
?>
</body>
//这是发布页面的代码 和添加页面的代码相似
<?php
<?php
session_start();
$re=$_POST["jsr"];
$comment=$_POST["neirong"];
$time=date("Y-m-d H:i:s"); //获取当前时间
$_SESSION["username"]=$user;
include("DADB.class.php");
$db=new DADB();
$sql="insert into liuyan VALUES ('','{$user}','{$jsr}','{$time}','{$comment}',false)";
if($db->Query($sql,0))
{
header("location:main.php");
}
else{
echo"发布失败";
}
?>
?>
一个简单的留言板已经完成了，退出的时候需要清除session 并且返回到登录页面
//退出页面代码
<?php
session_start();
unset($_SESSION["username"]);
header("location:login.php");
?>
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1422
52
1316
25
1266
29
1239
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
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,
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.
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
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.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
Explain the match expression (PHP 8 ) and how it differs from switch.
Apr 06, 2025 am 12:03 AM
In PHP8, match expressions are a new control structure that returns different results based on the value of the expression. 1) It is similar to a switch statement, but returns a value instead of an execution statement block. 2) The match expression is strictly compared (===), which improves security. 3) It avoids possible break omissions in switch statements and enhances the simplicity and readability of the code.
