23-Jul-2003, 11:02
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Senior Member
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Join Date: Aug 2001
Location: KUL, Malaysia
Posts: 3,371
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[script] Password Protect web pages/site using PHP and MySQL
The 'engine' behind this Password Protect web pages / sites using PHP script:
PHP Code:
<?php
/**
* @domain: DESILVA.BIZ
* @file: EXAMPLE_SESSION_FUNCTIONS.PHP
* @author: J de Silva
* @website: [url]www.desilva.biz[/url]
* @email: scripts[AT]desilva[DOT]biz
* @copyright: Gen.I designs
* @date: July 24th, 2003
* @version: n/a
* @about: The 'engine' behind a simple PHP / MySQL session based
login / password protecting web pages script. Contains
key functions for the LOGIN system.
*
/*===================================*/
ini_set( 'session.name', 's' );
/* the URL to the login page is defined... */
define( 'URL_LOGIN_PAGE', '/example_login.php' );
// start the session...
session_start();
/* One of the main functions of this included script is
to check that the page including this script is
being used by a valid user. There is ONE exception:
when the person is actually LOGGING IN. */
if( !defined('LOGGING_IN') )
{
verify_if_valid_user();
}
/* All the relevant functions are listed below. */
//------------------------------------------------
function match_user_in_db( $user, $pass )
{
// it would be wiser for you to connect to the db using
// a custom function here but for the purpose of this tutorial
// I am including the connection right here...
$conn = mysql_connect( 'localhost', 'root', '' );
mysql_select_db( 'mw' );
$sql = 'SELECT `username`
FROM `account`
WHERE `username` = "'.$user.'"
AND `password` = "'.$pass.'"';
$result = mysql_query( $sql, $conn );
if( mysql_num_rows($result)==1 )
{
$_SESSION['valid_user'] = mysql_result( $result, 0, 0 );
/* the php.ini setting for 'session.use_trans_sid' should be 1
for the following line to work, so if this script doesn't seem
to be working well for you, you know where to look! */
die( header('location:/example_secret_page_1.php?'.SID) );
}
else
{
die( header('location:'.URL_LOGIN_PAGE) );
}
}
function process_login()
{
/* Used ONLY in the LOGIN page. */
$username = mysql_escape_string( trim($_POST['username']) );
/* if you store the passwords without using md5,
of course, edit the following line too. */
$password = md5( trim($_POST['password']) );
match_user_in_db( $username, $password );
}
function process_logout()
{
/* used ONLY in the LOGOUT page. */
session_destroy();
unset( $_SESSION );
die( header('location:'.URL_LOGIN_PAGE) );
}
function verify_if_valid_user()
{
if( !isset($_SESSION['valid_user']) )
{
// user not logged in yet!
// re-direct them to the login page
die( header('location:'.URL_LOGIN_PAGE) );
}
}
?>
The sample LOGIN page:
PHP Code:
<?php
// FILENAME: EXAMPLE_LOGIN.PHP
// ---------------------------------------
if( isset($_POST['user_login']) )
{
define( 'LOGGING_IN', true );
// include the 'session functions' file
include_once( './example_session_functions.php' );
process_login();
}
else
{
?>
<html>
<head>
<title>Login Page</title>
</head>
<body>
<h1>Login Here</h1>
<form name="loginform" id="loginform" method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<p>
<input name="username" type="text" id="username" size="30" maxlength="30" />
Username</p>
<p>
<input name="password" type="password" id="password" size="30" maxlength="30" />
Password</p>
<p>
<input type="submit" name="user_login" value="Submit" />
</p>
</form>
</body>
</html>
<?php
}
?>
The sample LOGOUT page:
PHP Code:
<?php
// FILENAME: EXAMPLE_LOGOUT.PHP
// ---------------------------------------
include_once( './example_session_functions.php' );
process_logout();
?>
The sample SECRET PAGE page:
PHP Code:
<?php
// FILENAME: EXAMPLE_SECRET_PAGE_1.PHP
// ---------------------------------------
// include the 'session functions' file
include_once( './example_session_functions.php' );
?>
<html>
<head>
<title>Secret Page 1</title>
</head>
<body>
<h1>Secret 1</h1>
<p>Hello <strong><?php echo $_SESSION['valid_user']; ?></strong>,</p>
<p>Just one secret here.</p>
<ul>
<li><a href="/example_secret_page_2.php">Go to Page 2</a></li>
<li><a href="/example_secret_page_1.php">Go to Secret Page homepage</a></li>
<li><a href="/example_logout.php">Logout</a></li>
</ul>
</body>
</html>
The sample SECRET PAGE 2 page:
PHP Code:
<?php
// FILENAME: EXAMPLE_SECRET_PAGE_2.PHP
// ---------------------------------------
// include the 'session functions' file
include_once( './example_session_functions.php' );
?>
<html>
<head>
<title>Secret Page 2</title>
</head>
<body>
<h1>Secret 2</h1>
<p>Hello <strong><?php echo $_SESSION['valid_user']; ?></strong>,</p>
<p>Just another secret here.</p>
<ul>
<li><a href="/example_secret_page_2.php#">Go to Page 3</a></li>
<li><a href="/example_secret_page_1.php">Go to Secret Page homepage</a></li>
<li><a href="/example_logout.php">Logout</a></li>
</ul>
</body>
</html>
If you have any problems following this script or would simply like to make a suggestion, follow the discussion here: Using PHP sessions to password-protect web pages.
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