[Opserty]

Try:

PHP Code:

// ...
if($_REQUEST['do'] == '')
{
    print_form_header('mypage_admin', 'updatemanager');
    print_table_header($vbphrase[my_manager]);
    print_input_row('File Uploads Location:', 'uploads_location', 'testdata', 'false', '50', '260');
    print_submit_row($vbphrase['save'], $vbphrase['reset']);
    print_table_footer(3, '', '', 0);
}
// ...
elseif ($_REQUEST['do'] == 'updatemanager')
{
  // VALIDATE ENTERED DATA
      $vbulletin->input->clean_array_gpc('p', array(
          'uploads_location' => TYPE_STR
    ));

  if (!$vbulletin->GPC['uploads_location'])
  {
    print_stop_message('fieldmissing');
  }
}