0 How to password protected HTML web pages ?

In this tutorial we're going to build a login system using Anuj Hack Master and PHP.
This means you need a webhosting account which supports PHP!
Our example will have 4 pages:
1. login.php, this page will display the login form.
2. logout.php, this page can be used to logout.
3. verify.php, this page will verify the username/password combination.
4. protected_page.php, an example of a protected page

1. Creating the login pagea) Add a new page using the Site Manager and change its name to 'login'.
b) Make sure the File Extension in Page Properties is set to 'php'!
c) Add a Form, with these properties:
Name: LoginForm
Action: verify.php
Method: POST
Encoding type: <empty>
d) Add an Editbox and set its name to 'username'.
e) Add another Editbox and set its name to 'password'.
f) Add a Push Button and set the buttontype to 'Submit', change the value to 'Login'.

2. Creating the logout pagea) Add a new page using the Site Manager and change its name to 'logout'.
b) Make sure the File Extension in Page Properties is set to 'php'!
c) Open Page HTML, select the 'Start of Page' tab and enter this code:
<?php
session_start();
session_unset();
session_destroy();
?>

3. Creating the verify page
a) Add a new page using the Site Manager and change its name to 'verify'.
b) Make sure the File Extension in Page Properties is set to 'php'!
c) Open Page HTML, select the 'Start of Page' tab and enter this code:
<?php
$usernames = array("user1", "user2", "user3", "admin");
$passwords = array("password1", "password2", "password3", "admin");
$page = "protected_page.php";

for($i=0;$i<count($usernames);$i++)
{
  $logindata[$usernames[$i]]=$passwords[$i];
}

$found = 0;
for($i=0;$i<count($usernames);$i++)
{
   if ($usernames[$i] == $_POST["username"])
   {
   $found = 1;
   }
}
if ($found == 0)
{
   header('Location: login.php?login_error=1');
   exit;
}

if($logindata[$_POST["username"]]==$_POST["password"])
{
   session_start();
   $_SESSION["username"]=$_POST["username"];
   header('Location: '.$page);
   exit;
}
else
{
   header('Location: login.php?login_error=1');
   exit;
}
?> 

This is the place to add new users.
To add a new user edit this code:

$usernames = array("user1", "user2", "admin", "new user");

Note that we've added a new user called 'new user'
Make sure you add the user's password (in the same position in the password array):

$passwords = array("password1", "password2", "admin", "new password");
4. Creating a password protected pagea) Add a new page using the Site Manager and change its name to 'protected_page'.
b) Make sure the File Extension in Page Properties is set to 'php'!
c) Open Page HTML, select the 'Start of Page' tab and enter this code:

<?php
session_start();
if(!isset($_SESSION["username"]))
{
   header('Location: login.php');
   exit;
}
?>

This code will check whether the user was succesfully logged on, if not then it will redirect the user to the login page.