if (empty($username) || empty($password)) {
$errors[] = 'You need to enter a username and password';
} elseif (mysql_num_rows(mysql_query("SELECT username FROM users WHERE username = '".$username."'")) != 1) {
$errors[] = 'We can\'t find that username. Have you registered?';
} elseif (!user_active($username)) {
$errors[] = 'You haven\'t activated your account!';
} else {
// cia kazkas vyksta jei prisijungem gerai
}
print_r($errors);