test

<?php
defined('MOODLE_INTERNAL') || die();
require_once($CFG->libdir.'/formslib.php');
class enrol_instance_mass_edit_form extends moodleform {
    public function definition() {
        global $DB;
        $mform = $this->_form;
        list($instance, $plugin, $context, $type, $returnurl) = $this->_customdata;
        $mform->addElement('header', 'header', get_string('pluginname', 'enrol_' . $type));
        $mform->addElement('checkbox', 'del', get_string('del_old', 'tool_scet'));
        $plugin->edit_instance_form($instance, $mform, $context);
        $mform->addElement('hidden', 'id');
        $mform->setType('id', PARAM_INT);
        $mform->addElement('hidden', 'act');
        $mform->setType('act', PARAM_RAW);
        $instance->act = 'add';
        $mform->addElement('hidden', 'type');
        $mform->setType('type', PARAM_COMPONENT);
        $instance->type = $type;
        $mform->addElement('hidden', 'returnurl');
        $mform->setType('returnurl', PARAM_LOCALURL);
        $mform->setConstant('returnurl', $returnurl);
        $this->add_action_buttons(true, ($instance->id ? null : get_string('addinstance', 'enrol')));
        $this->set_data($instance);
    }
    /**
     * Validate this form. Calls plugin validation method.
     *
     * @param array $data
     * @param array $files
     * @return array
     */
    public function validation($data, $files) {
        $errors = parent::validation($data, $files);
        list($instance, $plugin, $context, $type) = $this->_customdata;
        $pluginerrors = $plugin->edit_instance_validation($data, $files, $instance, $context);
        $errors = array_merge($errors, $pluginerrors);
        return $errors;
    }
}