Login using php is typical task. In login using php session maintained and direct url navigation to home page directly from url is prohibited or restricted.
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test_login1.sql databse import file:
-- phpMyAdmin SQL Dump
-- version 3.2.0.1
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Jun 01, 2013 at 01:42 AM
-- Server version: 5.1.36
-- PHP Version: 5.3.0
SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
--
-- Database: `test_login1`
--
-- --------------------------------------------------------
--
-- Table structure for table `user`
--
CREATE TABLE IF NOT EXISTS `user` (
`user_id` int(5) NOT NULL AUTO_INCREMENT,
`username` varchar(50) NOT NULL,
`password` varchar(32) NOT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ;
--
-- Dumping data for table `user`
--
INSERT INTO `user` (`user_id`, `username`, `password`) VALUES
(1, 'pmbtech', '317d39252445fd1a38689e1c5328e1e0'),
(2, 'test', '098f6bcd4621d373cade4e832627b4f6');
login.php code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Login :: Test</title>
<style type="text/css">
#login_div
{
border:solid;
border-color:#9900FF;
position:absolute;
margin-top:20%;
margin-left:40%;
padding:5px 5px 5px 5px;
}
</style>
</head>
<body>
<div id="login_div" align="center" >
<form method="post" action="auth.php">
Username:<input type="text" name="username" id="username" placeholder="Username" /><br/>
Password:<input type="password" name="password" id="password" onpaste="return false" placeholder="password
" /><br/><br/>
<input type="submit" value="Login" />
<input type="reset" value="Cancel" />
</form>
</div>
</body>
</html>
auth.php code:
<?php
session_start();
//to connect sql server
$con=mysql_connect("localhost","root","") or die("db server is not connected");
// to connect database
mysql_select_db("test_login1") or die("db selection problem");
if(isset($_POST["username"]) && isset($_POST["password"]))
{
$username=$_POST["username"];
$password=md5($_POST["password"]);
$sql="select * from user where username='".$username."' and password='".$password."';";
//sql select queryis executed
$result=mysql_query($sql,$con) or die("query problem in execution");
if(mysql_num_rows($result) > 0)
{
$_SESSION["username"]=$username;
$_SESSION["is_login"]=True;
//die("succe");
header("Location:welcome.php");
}
else
{
die("Unauthorized activity found!!!");
}
}
else
{
//it is for hacker who directly come this page if then redirected to login page
//die("not set");
header("Location:login.php");
}
?>
welcome.php code:
<?php
//validation for user directly not come in welcome page through url, so redirected login page
session_start();
if($_SESSION["is_login"]!=True || !isset($_SESSION["is_login"]))
{
header("Location:login.php");
die();
exit();
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Welcome page</title>
</head>
<body>
Welcome <?php if(isset($_SESSION["username"])) echo $_SESSION["username"];?>
</body>
</html>
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