if(!isset($_POST['actio'])){
$hidden = array('actio' => '1');
echo form_open('user','',$hidden);
$user = array(
              'name'        => 'username',
              'id'          => 'username',
              'value'       => 'johndoe',
              'maxlength'   => '20',
              'size'        => '20',
            );
echo form_label('Username:','username'), form_input($user)."<br>";
$password = array(
              'name'        => 'password',
              'id'          => 'password',
              'value'       => 'johndoe',
              'maxlength'   => '20',
              'size'        => '20',
            );
echo form_label('Password:','password'),form_password($password)."<br>";
echo form_submit('login','Login');
echo form_close();
}
else{
    $username = $_POST['username'];
    $p = $_POST['password'];
    $pw = md5($p);
    $query = $this->db->query("SELECT * FROM `users` WHERE user_nome = '$username' AND user_pass = '$pw'");
    $num = $query->num_rows();
    echo $num;
    if($num == 1){
$cookie = array(
'name' => 'loggedin',
'value' => "$username",
'expire' => '86500',
'domain' => 'luisleite.net',
'prefix' => 'ap_'
);
set_cookie($cookie);
        echo "Login realizado<br>";
        echo get_cookie('username');
    }
    else{
        echo "Algo está errado<br>";
    }
}
?>