Backend DevelopmentPHP TutorialLogin page information prompt function implemented in PHP (example analysis)Login page information prompt function implemented in PHP (example analysis)
This article mainly introduces the login page information prompt function implemented by PHP, involving PHP form submission, database query, judgment and session data storage and other related operating skills. Friends in need can refer to it
The details are as follows ：
login.php:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="check_login.php" name="loginform" method="post">
帐号：
<input type="text" name="name" />
密码：
<input type="password" name="pwd" />
<input type="submit" value="登 录" />
</form>
<?php
echo "<br/>";
//通过 error 值，确定提示信息
if(!empty($_GET['error'])){
$error=$_GET['error'];
If($error==1){
Echo "<font color ='red'>您输入的账号或密码错误！</font>";
}elseif ($error==2){
Echo "<font color ='red'>您输入的账号或密码正确！</font>";
}
}
?>
</body>
</html><?php
header("Content-type: text/html; charset=utf-8");
session_start(); //初始化session变量
$username = $_POST['name']; //接收表单提交的用户名
$password=md5($_POST['pwd']); //接收表单提交的密码
class chkinput //定义类
{
var $name;
var $pwd;
function chkinput($x,$y) //定义一个方法
{
$this->name=$x; //将管理员名称传给类对象$this->name
$this->pwd=$y; //将管理员密码传给类对象$this->pwd
}
function checkinput()
{
include("conn.php"); //连接数据库文件
$sql=mysql_query("select username,password from admin where username='".$this->name."' and password='".$this->pwd."'",$conn);
$info=mysql_fetch_array($sql); //检索管理员名称和密码是否正确
if($info==false) //如果管理员名称或密码不正确，则弹出相关提示信息
{
header("location:login.php?error=1");
exit;
}
else //如果管理员名称或密码正确，则直接跳转到登陆成功后界面
{
header("location:login.php?error=2");
$_SESSION['admin_name']=$info['username']; //将管理员名称存到$_SESSION[admin_name]变量中
$_SESSION['pwd']=$info['password']; ////将管理员名称存到$_SESSION[pwd]变量中
}
}
}
$obj=new chkinput(trim($username),trim($password)); //创建对象
$obj->checkinput(); //调用类
?>
<?php
header("Content-type: text/html; charset=utf-8");
$conn = mysql_connect("localhost","root","111111");
if(!$conn)
{
die("连接数据库失败".mysql_error());
}
mysql_select_db("design") or die("数据库选择失败".mysql_error());
mysql_query("set names 'uft8'");
?>
PHP user remote locationLogin reminderImplementation code
thinkPHP framework implements user remote locationLogin reminder
PHP code sharing for implementing user remote login reminder function
##
The above is the detailed content of Login page information prompt function implemented in PHP (example analysis). For more information, please follow other related articles on the PHP Chinese website!
What data can be stored in a PHP session?May 02, 2025 am 12:17 AMPHPsessionscanstorestrings,numbers,arrays,andobjects.1.Strings:textdatalikeusernames.2.Numbers:integersorfloatsforcounters.3.Arrays:listslikeshoppingcarts.4.Objects:complexstructuresthatareserialized.
How do you start a PHP session?May 02, 2025 am 12:16 AMTostartaPHPsession,usesession_start()atthescript'sbeginning.1)Placeitbeforeanyoutputtosetthesessioncookie.2)Usesessionsforuserdatalikeloginstatusorshoppingcarts.3)RegeneratesessionIDstopreventfixationattacks.4)Considerusingadatabaseforsessionstoragei
What is session regeneration, and how does it improve security?May 02, 2025 am 12:15 AMSession regeneration refers to generating a new session ID and invalidating the old ID when the user performs sensitive operations in case of session fixed attacks. The implementation steps include: 1. Detect sensitive operations, 2. Generate new session ID, 3. Destroy old session ID, 4. Update user-side session information.
What are some performance considerations when using PHP sessions?May 02, 2025 am 12:11 AMPHP sessions have a significant impact on application performance. Optimization methods include: 1. Use a database to store session data to improve response speed; 2. Reduce the use of session data and only store necessary information; 3. Use a non-blocking session processor to improve concurrency capabilities; 4. Adjust the session expiration time to balance user experience and server burden; 5. Use persistent sessions to reduce the number of data read and write times.
How do PHP sessions differ from cookies?May 02, 2025 am 12:03 AMPHPsessionsareserver-side,whilecookiesareclient-side.1)Sessionsstoredataontheserver,aremoresecure,andhandlelargerdata.2)Cookiesstoredataontheclient,arelesssecure,andlimitedinsize.Usesessionsforsensitivedataandcookiesfornon-sensitive,client-sidedata.
How does PHP identify a user's session?May 01, 2025 am 12:23 AMPHPidentifiesauser'ssessionusingsessioncookiesandsessionIDs.1)Whensession_start()iscalled,PHPgeneratesauniquesessionIDstoredinacookienamedPHPSESSIDontheuser'sbrowser.2)ThisIDallowsPHPtoretrievesessiondatafromtheserver.
What are some best practices for securing PHP sessions?May 01, 2025 am 12:22 AMThe security of PHP sessions can be achieved through the following measures: 1. Use session_regenerate_id() to regenerate the session ID when the user logs in or is an important operation. 2. Encrypt the transmission session ID through the HTTPS protocol. 3. Use session_save_path() to specify the secure directory to store session data and set permissions correctly.
Where are PHP session files stored by default?May 01, 2025 am 12:15 AMPHPsessionfilesarestoredinthedirectoryspecifiedbysession.save_path,typically/tmponUnix-likesystemsorC:\Windows\TemponWindows.Tocustomizethis:1)Usesession_save_path()tosetacustomdirectory,ensuringit'swritable;2)Verifythecustomdirectoryexistsandiswrita
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
MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.
DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software
Notepad++7.3.1
Easy-to-use and free code editor
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
Dreamweaver CS6
Visual web development tools
