if(isset($_POST['enviar'])){

$_SESSION['nombre']=$_POST['firstname'];
$_SESSION['apellido']=$_POST['lastname'];
$_SESSION['direccion']=$_POST['direccion'];
$_SESSION['provincia']=$_POST['provincia'];
$_SESSION['ciudad']=$_POST['city'];
$_SESSION['zip']=$_POST['zip'];
$_SESSION['fono']=$_POST['phone'];
$_SESSION['email']=$_POST['email'];

echo '<script>window.location="../checkout2.php";</script>';

}

 $envio = 0;

//validacion sector

 if($_SESSION['ciudad'] == "quito" || $_SESSION['ciudad'] ==
  "sangolqui" || $_SESSION['ciudad'] == "cumbaya" ||
  $_SESSION['ciudad'] == "tumbaco"){
$sector =1;
}elseif ($_SESSION['provincia'] == "galapagos" ) {
$sector = 3;
}else{
$sector = 2;
}
 // validacion precio envio
 switch ($sector) {
case 1:
    $envio = 2.35;
    break;

case 2:
    $envio = 4.90;
    break;

case 3:
    $envio = 8.30;
    break;
  }