Events.php

<?php

namespace Config;

use CodeIgniter\Events\Events;

/*
 * --------------------------------------------------------------------
 * Application Events
 * --------------------------------------------------------------------
 * Events allow you to tap into the execution of the program without
 * modifying or extending core files. This file provides a central
 * location to define your events, though they can always be added
 * at run-time, also, if needed.
 *
 * You create code that can execute by subscribing to events with
 * the 'on()' method. This accepts any form of callable, including
 * Closures, that will be executed when the event is triggered.
 *
 * Example:
 *      Events::on('create', [$myInstance, 'myMethod']);
 */

Events::on('pre_system', function () {
    if (ENVIRONMENT !== 'testing') {
        while (\ob_get_level() > 0) {
            \ob_end_flush();
        }

        \ob_start(function ($buffer) {
            return $buffer;
        });
    }

    /*
     * --------------------------------------------------------------------
     * Debug Toolbar Listeners.
     * --------------------------------------------------------------------
     * If you delete, they will no longer be collected.
     */
    if (ENVIRONMENT !== 'production') {
        Events::on(
            'DBQuery',
            'CodeIgniter\Debug\Toolbar\Collectors\Database::collect'
        );
        Services::toolbar()->respond();
    }
});