Register and login tutorials
Posted: Fri Sep 09, 2011 10:36 am
Hi everyone, forum newbie and going php crazy.
Spent the last 2 days trying to find out my mistakes and I'm going code blind, just can't see them, but it's not working so I've done something/s wrong obviously.
I've used the same file structure as in the tutorials, Parent: register.php, login.php, logout.php, protected.php, and core file: init.inc.php and inc file: user.inc.php - uploaded to the server, but when I try to access the pages I get this from firefox:
..cookies are enabled so that's not the problem, when i browse the register page from Dreamweaver I get this result:
..and when I browse the login page I get this result:
Just about to give up so if anyone could politely point out how stupid I am I would be very grateful. Code is as you see but with db info starred out.
All the best, love the tutorials just wish I could get it working.
login.php:
Spent the last 2 days trying to find out my mistakes and I'm going code blind, just can't see them, but it's not working so I've done something/s wrong obviously.
I've used the same file structure as in the tutorials, Parent: register.php, login.php, logout.php, protected.php, and core file: init.inc.php and inc file: user.inc.php - uploaded to the server, but when I try to access the pages I get this from firefox:
..cookies are enabled so that's not the problem, when i browse the register page from Dreamweaver I get this result:
..and when I browse the login page I get this result:
Just about to give up so if anyone could politely point out how stupid I am I would be very grateful. Code is as you see but with db info starred out.
All the best, love the tutorials just wish I could get it working.
login.php:
<?php
include('core/init.inc.php');
$errors = array();
if (isset($_POST['username'], $_POST['password'])){
if (empty($_POST['username'])){
$errors[] = 'The Username cannot be empty.';
}
if (empty($_POST['password'])){
$errors[] = 'The Password cannot be empty.';
}
if (valid_credentials($_POST['username'], $_POST['password']) === false){
$errors[] = 'Username / Password Incorrect.';
}
if (empty($errors)){
$_SESSION['username'] = htmlentities($_POST['username']);
header('Location: protected.php');
die();
}
}
?>
<!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>Untitled Document</title>
</head>
<body> <div>
<?php
if (empty($errors) === false){
?>
<ul>
<?php
foreach ($errors as $error){
echo "<li>{$error}</li>";
}
?>
</ul>
<?php
}else{
echo 'Need an account ? <a href="register.php">Register here</a>';
}
?>
</div>
<form action="" method="post">
<p>
<label for="username">Username:</label>
<input type="text" name="username" id="username" value="<?php if (isset($_POST['username'])) echo htmlentities($_POST['username']); ?>" />
</p>
<p>
<label for="password">Password:</label>
<input type="password" name="password" id="password" />
</p>
<p>
<input type="submit" value="Login" />
</p>
</form>
</body>
</html>
register.php<?php
include('core/init.inc.php');
$errors = array();
if (isset($_POST['username'], $_POST['password'], $_POST['repeat_password'])){
if (empty($_POST['username'])){
$errors[] = 'The Username cannot be empty.';
}
if (empty($_POST['password']) || empty($_POST['repeat_password'])){
$errors[] = 'The Password cannot be empty.';
}
if ($_POST['password'] !== $_POST['repeat_password']){
$errors[] = 'Password Verification Failed.';
}
if (user_exists($_POST['username'])){
$errors[] = 'The Username you entered is already taken.';
}
if (empty($errors)){
add_user($_POST['username'], $_POST['password']);
$_SESSION['username'] = htmlentities($_POST['username']);
header('Location: protected.php');
die();
}
}
?>
<!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>Untitled Document</title>
</head>
<body>
<div>
<?php
if (empty($errors) === false){
?>
<ul>
<?php
foreach ($errors as $error){
echo "<li>{$error}</li>";
}
?>
</ul>
<?php
}
?>
</div>
<form action="" method="post">
<p>
<label for="username">Username:</label>
<input type="text" name="username" id="username" value="<?php if (isset($_POST['username'])) echo htmlentities($_POST['username']); ?>" />
</p>
<p>
<label for="password">Password:</label>
<input type="password" name="password" id="password" />
</p>
<p>
<label for="repeat_password">Repeat Password:</label>
<input type="password" name="repeat_password" id="repeat_password" />
</p>
<p>
<input type="submit" value="Register" />
</p>
</form>
</body>
</html>
protected.php<?php include('core/init.inc.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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
<body>
You are logged in as <?php ?>
</body>
</html>
logout.php<?php
session_start();
$_SESSION = array();
session_destroy();
header('Location: protected.php');
?>
init.inc.php<?php
session_start();
$exceptions = array('register', 'login');
$page = substr(end(explode('/', $SERVER['SCRIPT_NAME'])), 0, -4);
if (in_array($page, $exceptions) === false){
if (isset($SESSION['username']) === false){
header('location: login.php');
die();
}
}
mysql_connect('localhost', '******', '**********');
mysql_select_db('********');
$path = dirname(__FILE__);
include("{$path}/inc/user.inc.php");
?>
user.inc.php<?php
// checks if the given username exists in the database.
function user_exists($user){
$user = mysql_real_escape_string($user);
$total = mysql_query("SELECT COUNT(`user_id`) FROM `users` WHERE `user_name` = '{$user}'");
return (mysql_result($total, 0) == '1') ? true : false;
}
// checks if the given username and password combination is valid.
function valid_credentials($user, $pass){
$user = mysql_real_escape_string($user);
$pass = sha1($pass);
$total = mysql_query("SELECT COUNT(`user_id`) FROM `users` WHERE `user_name` = '{$user}' AND `user_password` = '{$pass}'");
return (mysql_result($total, 0) == '1') ? true : false;
}
// adds a user to the database.
function add_user($user, $pass){
$user = mysql_real_escape_string(htmlentities($user));
$pass = sha1($pass);
mysql_query("INSERT INTO `users` (`user_name`, `user_password`) VALUES ('{$user}', '{$pass}')");
}
?>
but all working fine now.