C:/xampp/htdocs/moodle/filter/local_settings_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');

abstract class filter_local_settings_form extends moodleform {
    protected $filter;
    protected $context;

    public function __construct($submiturl, $filter, $context) {
        $this->filter = $filter;
        $this->context = $context;
        parent::moodleform($submiturl);
    }

    public function definition() {
        $mform = $this->_form;

        $this->definition_inner($mform);

        $mform->addElement('hidden', 'contextid');
        $mform->setType('contextid', PARAM_INT);
        $mform->setDefault('contextid', $this->context->id);

        $mform->addElement('hidden', 'filter');
        $mform->setType('filter', PARAM_SAFEPATH);
        $mform->setDefault('filter', $this->filter);

        $this->add_action_buttons();
    }

    abstract protected function definition_inner($mform);

    public function save_changes($data) {
        $data = (array) $data;
        unset($data['filter']);
        unset($data['contextid']);
        foreach ($data as $name => $value) {
            if ($value !== '') {
                filter_set_local_config($this->filter, $this->context->id, $name, $value);
            } else {
                filter_unset_local_config($this->filter, $this->context->id, $name);
            }
        }
    }
}