function hidden_columns($result)
{
global $frm_cols;
$form_id = FrmProAppHelper::get_current_form_id();
$return = false;
foreach ((array) $result as $r) {
if (!empty($r)) {
$form_prefix = explode('_', $r);
$form_prefix = $form_prefix[0];
if ((int) $form_prefix == (int) $form_id) {
$return = true;
break;
}
unset($form_prefix);
}
}
if ($return) {
return $result;
}
$i = count($frm_cols);
$max_columns = 8;
if ($i > $max_columns) {
global $frm_current_form;
if ($frm_current_form) {
$frm_current_form->options = maybe_unserialize($frm_current_form->options);
}
if ($frm_current_form and isset($frm_current_form->options['hidden_cols']) and !empty($frm_current_form->options['hidden_cols'])) {
$result = $frm_current_form->options['hidden_cols'];
} else {
$cols = $frm_cols;
$cols = array_reverse($cols, true);
$result[] = $form_id . '_id';
$i--;
$result[] = $form_id . '_item_key';
$i--;
foreach ($cols as $col_key => $col) {
if ($i > $max_columns) {
$result[] = $col_key;
}
//remove some columns by default
$i--;
}
}
}
return $result;
}