<?php
$username = $_POST['username'];
$password = $_POST['password'];

if ($username && $password) {
include ('connect.php');
$query = mysql_query("SELECT * FROM users WHERE username='$username' AND password='$password'");
$numrows = mysql_num_rows ($query);
}
if ($numrows == 1) {
$row = mysql_fetch_assoc ($query);
$dbuser = $row['username'];
$_SESSION['username'] = $dbuser;

echo 'Du er nu logget ind!';
}else {
die ('Forkert kode eller brugernavn.');
}
?>