Clear cache after save orders using draggable views in Drupal 7
Sometimes "#submit" functions of HOOK_form_alter are get changes. SO please try adding $form['#after_build']. Your code will be like.

function phponwebsites_form_alter(&amp;$form, &amp;$form_state, $form_id) {
  if ($form_id == 'views_form_test_views') {
    $form['#after_build'][] = 'phponwebsites_draggable_custom_afterbuild';
  }
}
function phponwebsites_draggable_custom_afterbuild($form, $form_state) {   
  $form['#submit'][] = 'phponwebsites_draggable_custom_submit'; 
  return $form;
}
function phponwebsites_draggable_custom_submit(&amp;$form, $form_state) {
  print_r('ss');exit;
  drupal_flush_all_caches();
}