Form submission handler for file_module_test_form().
function file_module_test_form_submit($form, &$form_state) {
if ($form['#tree']) {
$uploads = $form_state['values']['nested']['file'];
}
else {
$uploads = $form_state['values']['file'];
}
if ($form['nested']['file']['#extended']) {
$uploads = $uploads['fids'];
}
$fids = array();
foreach ($uploads as $fid) {
$fids[] = $fid;
}
drupal_set_message(t('The file ids are %fids.', array(
'%fids' => implode(',', $fids),
)));
}