edit_form.php

<?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/>.

/**
 * Edit instance config.
 *
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 *
 * @package    block_user_favorites
 * @copyright  26-10-2018 MFreak.nl
 * @author     Luuk Verhoeven
 **/

/**
 * Class block_user_favorites_edit_form
 *
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 *
 * @package    block_user_favorites
 * @copyright  26-10-2018 MFreak.nl
 * @author     Luuk Verhoeven
 */
class block_user_favorites_edit_form extends block_edit_form {

    /**
     * specific_definition
     *
     * @param object $mform
     *
     * @throws coding_exception
     */
    protected function specific_definition($mform): void {

        $mform->addElement('header', 'configheader', get_string('blocksettings', 'block'));

        // A sample string variable with a default value.
        $mform->addElement('text', 'config_title', get_string('pluginname', 'block_user_favorites'));
        $mform->setDefault('config_title', get_string('pluginname', 'block_user_favorites'));
        $mform->setType('config_title', PARAM_TEXT);
    }

}