Login.php

<?php
session_start();
require("config.php");
$mysqli = new mysqli($server, $username, $password, $database);

if (isset($_POST['user']) and isset($_POST['pass']))
{
    $luser = $_POST['user'];
    $lpass = base64_encode($_POST['pass']);

    $stmt = $mysqli->prepare("SELECT * FROM users WHERE user=? AND pass=?");
    $stmt->bind_param('ss', $luser, $lpass);

    $stmt->execute();
    $stmt->store_Result();

    if ($stmt->num_rows == 1)
    {
        $_SESSION['user'] = $luser;
        header('Location: ?page=upload');
    }
    else
    {
        echo "Login failed.";
    }
}
else
{
    ?>
    <form action="" method="POST">
    <label>Username: </label><input id="user" type="test" name="user"><br />
    <label>Password: </label><input id="pass" type="password" name="pass"><br />
    <input type="submit" name="submit" value="Login">
    </form>
    <?php
}