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PHP practical example using sessions with private content login system

Nov 09, 2010 Author: Dr_ViRuS

A few days ago the students of Faculty of Informatics in some place got a exam One of the tasks was to make a 3 pages. page3.php is private and should login with username and password. The structure of the task is:

Page1.php
Page2.php
Page3.php - private
Form3.php - form for login in

Attention this task is a classical example The main goal of the task is to show practical use of php sessions.

page1.php

<!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>
<title>Login</title>
</head>
<body>
<a href="page2.php">Page 2 Public</a>
<a href="page3.php">Page 3 Private</a>
</body>

page2.php

<!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>
<title>Loign</title>
</head>
<body>
<h1>This is public page </h1>
<a href="page1.php">Page 1 Public</a>
<a href="page3.php">Page 3 Private</a>
</body>
<html>

page3.php

<?php 
   session_start();
   if (!$_SESSION['loged'] )
   {
      header("Location:form3.php");
	   die();
   }
   if ($_GET["logout"] == true)
   {
		session_destroy();
		header("Location:form3.php");
   }
?>
<!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>
<title>login</title>
</head>
<body>
<p>Private content</p>
<p><a href="?logout=true">Logout</a></p>
<a href="page1.php">Page 1 Public</a>
<a href="page2.php">Page 2 Public</a>
</body>
</html>

form3.php

<?php session_start();
    
    if ($_SESSION['loged'] == true)
    {
	
        header('Location: page3.php');
    }
    
    if ($_POST['submit'])
    {
	  if ($_POST['username'] == 'douglas.adams' && $_POST['password'] == 'hitch42hike' )
        {
            $_SESSION['loged'] = true;
            header('Location: page3.php');
        }
        else
        {
            $error_login = "Wrong username and password";
        }
    }
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Login</title>
</head>
<? if ($error_login)
    {
        echo "<p>$error_login</p>";
    } 
?>
<form method="post" action="">
<label>User name</label>
<input name="username" type="text" /><br />
<label>Password</label>
<input name="password" type="password" />
<br />
<input type="submit" value="Login" name="submit" />
 </form>
<body>
<a href="page2.php">Page 2 Public</a>
<a href="page1.php">Page 1 Public</a>
username and password douglas.adams i hitch42hike
</body>
</html>

You can also check PHP login example whit MySQL