Keep variable after server side validation refresh

I am using 2 forms, one is redirecting to the other and the variable $region is also set according to a value of a dropdwn selection. I am appending the variable value in the URL by using this code.

<?php
$option = JRequest::getString('region', '', 'post');
switch ($option) {
  case 'LAM':
  default:
    $url = 'book-training?region=LAM';
    break;
  case 'APAC':
    $url = 'book-training?region=APAC';
    break;
  case 'EMEA':
    $url = 'training-form?region=EMEA';
    break;
   case 'NAM':
    $url = 'book-training?region=NAM';
    break;
}
$url = 'http://mydomain/'.$url;
$mainframe->redirect($url);
?>

On the second form I enquire the variable and use a hidden field

<?php
if ( !$mainframe->isSite()) {return;}
$region = JRequest::getVar('region', '', 'get');
?>
<input type="hidden" name="region" value="<?php echo "$region"; ?>" />

so I can use the variable to my form. After a server side validation occurs, I lose the value of $region. Is there any way I can send the variable back from server side validation or even declare it as global variable somehow?

Hi quantum_leap,

I assume from your other thread that you are now saving the region to the session.

Bob

Yes, thanks for your interest Bob, exactly as you said!

Is there any solutions?

Hi kate_ee,

Solutions to what exactly?

Bob