Php code example for Secure login

Php code example for login 

Login.php

Create a login.php file where you take input user name and password as shown the figure.
<?php
include("config.php");
session_start();
if($_SERVER["REQUEST_METHOD"] == "POST")
{
// username and password sent from form
$myusername=addslashes($_POST['adminuser']);
$mypassword=addslashes($_POST['adminpass']);
$sql="SELECT * FROM admin WHERE adminuser='$myusername' and adminpass='$mypassword'";
$result=mysql_query($sql);
$row=mysql_fetch_array($result);
$active=$row['active'];
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count==1)
{
session_register("myusername");
$_SESSION['login_adminuser']=$myusername;
header("location: index.php");
}
else
{
$error="Your Login Name or Password is invalid";
}
}
?>
<h2>Login</h2>
<form action="" method="post">
  <label>UserName  : </label>
  <br />
  <input type="text" name="adminuser" id="txtbox"/>
  <br />
  <br />
  <label>Password  : </label>
  <br />
  <input type="password" name="adminpass" class="box" id="txtbox" />
  <br/>
  <br />
  <input type="submit" value=" Submit " id="btn"/>
  <br />
</form>
<div style="font-size:11px; color:#cc0000; margin-top:10px"><?php echo $error; ?></div>
</div>

Config.php

Create a configuration file through you connect the mysql databse or any other configuration.
<?php
$mysql_hostname = "localhost";
$mysql_user = "your username ";
$mysql_password = "your password";
$mysql_database = "Your database";
$bd = mysql_connect($mysql_hostname, $mysql_user, $mysql_password) or die("Opps some thing went wrong");
mysql_select_db($mysql_database, $bd) or die("Opps some thing went wrong");
?>

lock.php

<?php
include('config.php');
session_start();
$user_check=$_SESSION['login_adminuser'];
//$ses_sql=mysql_query("select empuser from employeelogin where empuser='$user_check' ");
//$row=mysql_fetch_array($ses_sql);
$login_admin_session=$user_check;
if(!isset($login_admin_session))
{
header("Location: login.php");
}
?>

index.php

after successful login this is your secure page.
<?php
include('lock.php');
?>
<h2>WELCOME in Login Portal</h2> | <a href=’logout.php’>Logo out</a>

logout.php
after successful login this is your secure page.
<?php
session_start();
if(session_destroy())
{
header("Location: login.php");
}
?>

Database Structure

Table name : admin
CREATE TABLE `admin` (
  `adminuser` varchar(20) NOT NULL default '',
  `adminpass` varchar(20) NOT NULL default '',
  PRIMARY KEY  (`adminuser`),
  UNIQUE KEY `adminpass` (`adminpass`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;


This is a sample login page. You can modify or use it for your project.