get_file_storage()->delete_area_files($user_context->id, 'user', 'draft', file_get_submitted_draft_itemid(local_userenrols_plugin::FORMID_FILES));
redirect($course_url);
} elseif (!$mform->is_submitted() || null == ($formdata = $mform->get_data())) {
// GET request, or POST request where data did not
// pass validation, either case display the form
echo $OUTPUT->header();
echo $OUTPUT->heading_with_help(get_string('LBL_UNENROLL_TITLE', local_userenrols_plugin::PLUGIN_NAME), 'HELP_PAGE_UNENROLL', local_userenrols_plugin::PLUGIN_NAME);
// Display the form with a filepicker
echo $OUTPUT->container_start();
$mform->display();
echo $OUTPUT->container_end();
echo $OUTPUT->footer();
} else {
// POST request, submit button clicked and formdata
// passed validation, first check session spoofing
require_sesskey();
// Collect the input
$user_id_field = $formdata->{local_userenrols_plugin::FORMID_USER_ID_FIELD};
// Leave the file in the user's draft area since we
// will not plan to keep it after processing
$area_files = get_file_storage()->get_area_files($user_context->id, 'user', 'draft', $formdata->{local_userenrols_plugin::FORMID_FILES}, null, false);
$result = local_userenrols_plugin::unenroll_file($COURSE, $user_id_field, array_shift($area_files));
// Clean up the file area
get_file_storage()->delete_area_files($user_context->id, 'user', 'draft', $formdata->{local_userenrols_plugin::FORMID_FILES});
echo $OUTPUT->header();
echo $OUTPUT->heading_with_help(get_string('LBL_UNENROLL_TITLE', local_userenrols_plugin::PLUGIN_NAME), 'HELP_PAGE_UNENROLL', local_userenrols_plugin::PLUGIN_NAME);
// Output the processing result
echo $OUTPUT->box(nl2br($result));
echo $OUTPUT->continue_button($groups_url);
echo $OUTPUT->footer();
}
