Hello,
Recently I found a very easy way to create a User Member System with using PHP,HTML,XML and No MySQL. Thought it would e nice to show you,

STEP ONE: Making the Register Page.
PHP Code:
<?php
$errors = array();
if(isset($_POST['login'])){
    $username = preg_replace('/[^A-Za-z]/', '', $_POST['username']);
    $email = $_POST['email'];
    $password = $_POST['password'];
    $c_password = $_POST['c_password'];
    
    if(file_exists('users/' . $username . '.xml')){
        $errors[] = 'Username already exists';
    }
    if($username == ''){
        $errors[] = 'Username is blank';
    }
    if($email == ''){
        $errors[] = 'Email is blank';
    }
    if($password == '' || $c_password == ''){
        $errors[] = 'Passwords are blank';
    }
    if($password != $c_password){
        $errors[] = 'Passwords do not match';
    }
    if(count($errors) == 0){
        $xml = new SimpleXMLElement('<user></user>');
        $xml->addChild('password', md5($password));
        $xml->addChild('email', $email);
        $xml->asXML('users/' . $username . '.xml');
        header('Location: compleat.php');
        die;
    }
}
?>

<html xmlns="http://www.w3.org/1999/xhtml">
<head>

</head>
<body>
    <font size=1>
    <form method="post" action="">
        <?php
        if(count($errors) > 0){
            echo '<ul>';
            foreach($errors as $e){
                echo '<li>' . $e . '</li>';
            }
            echo '</ul>';
        }
        ?>
        <p>Username <input type="text" name="username" size="20" /></p>
        <p>Email <input type="text" name="email" size="20" /></p>
        <p>Password <input type="password" name="password" size="20" /></p>
        <p>Confirm Password <input type="password" name="c_password" size="20" /></p>
        <p><input type="submit" name="login" value="Register" /></p>
    </form>
</body></font>
</html>
STEP TWO: The Login
PHP Code:
<?php
$error = false;
if(isset($_POST['login'])){
    $username = preg_replace('/[^A-Za-z]/', '', $_POST['username']);
    $password = md5($_POST['password']);
    if(file_exists('users/' . $username . '.xml')){
        $xml = new SimpleXMLElement('users/' . $username . '.xml', 0, true);
        if($password == $xml->password){
            session_start();
            $_SESSION['username'] = $username;
            header('Location: index.php');
            die;
        }
    }
    $error = true;
}
?>
<form method="post" action="">
        <p>Username <input type="text" name="username" size="20" /></p>
        <p>Password <input type="password" name="password" size="20" /></p>
        <?php
        if($error){
            echo '<p>Invalid username and/or password</p>';
        }
        ?>
        <p><input type="submit" value="Login" name="login" /></p>
    </form>
STEP THREE: The Settings Page (To change Passwords)
PHP Code:
<?php
session_start();
if(!file_exists('users/' . $_SESSION['username'] . '.xml')){
    header('Location: login.php');
    die;
}
$error = false;
if(isset($_POST['change'])){
    $old = md5($_POST['o_password']);
    $new = md5($_POST['n_password']);
    $c_new = md5($_POST['c_n_password']);
    $xml = new SimpleXMLElement('users/' . $_SESSION['username'] . '.xml', 0, true);
    if($old == $xml->password){
        if($new == $c_new){
            $xml->password = $new;
            $xml->asXML('users/' . $_SESSION['username'] . '.xml');
            header('Location: logout.php');
            die;
        }
    }
    $error = true;
}

?>

<head>
</head>
<body>
    <span style='text-shadow: 1 0 0 black;'><font size=2>Change Password:</span>
    <form method="post" action="">
        <?php 
        if($error){
            echo '<p><u><h6>ERROR: A Password(s) has been typed Wrong! Try Again!</u></h6></p>';
        }
        ?>
        <p>Old password <input type="password" name="o_password" size=10 /></p>
        <p>New password <input type="password" name="n_password" size=10 /></p>
        <p>Confirm new password <input type="password" name="c_n_password" size=10 /></p>
        <p><input type="submit" name="change" value="Change Password" size=10 /></p>
    </form>
<hr />
<font size=1>IP Logged on you're Account: <span style='text-shadow: 1 0 0 black;'>
<?
$ip = getenv(REMOTE_ADDR);

print "".$ip;

?></span>
VERY IMPORTENT MAKE A FOLDER NAMMED "users" IF YOU DON'T NO USERS WILL BE ABLE TO LOGIN/REGISTERED. FOLDER USERS KEEPS THE LOGIN SCRIPTS THERE.

Enjoy.

---------- Post added at 11:32 PM ---------- Previous post was at 11:27 PM ----------

If theres any errors let me know and i'll fix them