C:/xampp/htdocs/moodle/enrol/meta/addinstance_form.php

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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

defined('MOODLE_INTERNAL') || die();

require_once("$CFG->libdir/formslib.php");

class enrol_meta_addinstance_form extends moodleform {
    protected $course;

    function definition() {
        global $CFG, $DB;

        $mform  = $this->_form;
        $course = $this->_customdata;
        $this->course = $course;

        $existing = $DB->get_records('enrol', array('enrol'=>'meta', 'courseid'=>$course->id), '', 'customint1, id');

        // TODO: this has to be done via ajax or else it will fail very badly on large sites!
        $courses = array('' => get_string('choosedots'));
        $rs = $DB->get_recordset('course', array(), 'sortorder ASC', 'id, fullname, shortname, visible');
        foreach ($rs as $c) {
            if ($c->id == SITEID or $c->id == $course->id or isset($existing[$c->id])) {
                continue;
            }
            $coursecontext = get_context_instance(CONTEXT_COURSE, $c->id);
            if (!$c->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
                continue;
            }
            if (!has_capability('enrol/meta:selectaslinked', $coursecontext)) {
                continue;
            }
            $courses[$c->id] = format_string($c->fullname). ' ['.format_string($c->shortname, true, array('context' => $coursecontext)).']';
        }
        $rs->close();

        $mform->addElement('header','general', get_string('pluginname', 'enrol_meta'));

        $mform->addElement('select', 'link', get_string('linkedcourse', 'enrol_meta'), $courses);
        $mform->addRule('link', get_string('required'), 'required', null, 'client');

        $mform->addElement('hidden', 'id', null);
        $mform->setType('id', PARAM_INT);

        $this->add_action_buttons(true, get_string('addinstance', 'enrol'));

        $this->set_data(array('id'=>$course->id));
    }

    function validation($data, $files) {
        global $DB, $CFG;

        // TODO: this is duplicated here because it may be necessary once we implement ajax course selection element

        $errors = parent::validation($data, $files);
        if (!$c = $DB->get_record('course', array('id'=>$data['link']))) {
            $errors['link'] = get_string('required');
        } else {
            $coursecontext = get_context_instance(CONTEXT_COURSE, $c->id);
            $existing = $DB->get_records('enrol', array('enrol'=>'meta', 'courseid'=>$this->course->id), '', 'customint1, id');
            if (!$c->visible and !has_capability('moodle/course:viewhiddencourses', $coursecontext)) {
                $errors['link'] = get_string('error');
            } else if (!has_capability('enrol/meta:selectaslinked', $coursecontext)) {
                $errors['link'] = get_string('error');
            } else if ($c->id == SITEID or $c->id == $this->course->id or isset($existing[$c->id])) {
                $errors['link'] = get_string('error');
            }
        }

        return $errors;
    }
}