External library()

I have a system made in native php, which I am moving to codeigniter 4, and I need to know how to include other files as shown in the photo. any help I am grateful.

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You can still include them like that or you can give them all the App\Libraries namespace
and then CodeIgniter would find them.

Top of class file use App/Libraries

You can have the also autoloaded using App/Config/Autoload.php

Look at the bottom of the file there is a files array to add them to.

What did you Try? What did you Get? What did you Expect?

Joined CodeIgniter Community 2009.  ( Skype: insitfx )

you can store those file in App folder, make it name SII,

each file add (namespace represent folder location of your file for autoload to work)
<?php
namespace App\SII ;
-- your class here..

to use those class just add on controller

use App\SII\{class-name1,class-name2},