【CodeIgniter3】フックを使ってコントローラーを拡張するクラスを複数作成する方法

hooks.php

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

/*
| -------------------------------------------------------------------------
| Hooks
| -------------------------------------------------------------------------
| This file lets you define "hooks" to extend CI without hacking the core
| files.  Please see the user guide for info:
|
|	https://codeigniter.com/user_guide/general/hooks.html
|
*/

$hook["pre_system"] = array(
    "class"    => "CI_Classes",
    "function" => "register",
    "filename" => "CI_Classes.php",
    "filepath" => "hooks",
    "params"   => array(APPPATH . "classes/")
);