Untitled

"register.php":

<?php

    include 'config.php';

        $username = $_POST['username'];
        $password = $_POST['password'];
        $password2 = $_POST['password2'];
        $confirm = $_POST['1'];

    if($password&&$password2==true)
    {
        if($password!=$password2)
        {
            Die("Please make sure the passwords are the same.");
        }
    }

    if($username&&$password==true)
    {
        $md5 = md5($password);
        mysql_query("INSERT INTO user (username, password)
        VALUES ('$username', '$md5')");
    }
    Elseif($username==""&&$confirm==true)
    {
        Die("Error: Make sure you enter a username!");
    }
    Elseif($password==""&&$confirm==true)
    {
        Die("Error: Make sure you enter a password!");
    }
?>
<html>
<body>

    <form action="register.php" method="post">
        Username: <input type="text" name="username" /><br>
        Password: <input type="password" name="password" /><br>
        Password again: <input type="password" name="password2" /><br>
        <input type="submit" value="Register!" name="1" />
    </form>

</body>
</html>


"login.php":

<?php
    include 'config.php';

        $password = $_POST['password'];
        $username = $_POST['username'];
        $md5 = md5($password);
        $expire=time()+60*60*24;

    $query = mysql_query("SELECT password FROM user WHERE username='$username'");
    echo $query;
    echo $query[0];
    if ($query[0]==$md5)
    {
        setcookie("username", $username, $expire);
        setcookie("password", $md5, $expire);
    }


?>


"index.php":

<?php

    if(isset($_COOKIE['username']) && isset($_COOKIE['password']))
    {
        echo "test";
    }

    echo $_COOKIE['username'] . $_COOKIE['password'];

?>

<html>
<body>

    <form action="login.php" method="post">
        Username: <input type="text" name="username" /><br>
        Password: <input type="password" name="password" />
        <input type="submit" value="log in" />
    </form>

</body>
</html>