moodle-filter_bibleversesnwt/filterlocalsettings.php

<?php
use filter_bibleversesnwt\bible;

class bibleversesnwt_filter_local_settings_form extends filter_local_settings_form {
    
    protected function definition_inner($mform) {
        $mform->addElement('select', 'biblelang', get_string('biblelang', 'filter_bibleversesnwt'), bible::languages());
        $mform->setType('biblelang', PARAM_NOTAGS);
    }

    /**
     * Override this method to save the settings to the database. The default
     * implementation will probably be sufficient for most simple cases.
     * @param object $data the form data that was submitted.
     */
    public function save_changes($data) {
        $data = (array) $data;
        unset($data['filter']);
        unset($data['contextid']);
        unset($data['submitbutton']);
        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);
            }
        }
    }
}