Question

I know I can nest libraries in subfolders, but can I do the same for Helpers?

The end result would be to have something to the effect of:

application/helpers/foo/bar_helper.php
application/helpers/baz_helper.php

Then call the helpers with:

$this->load->helper('foo/bar');
$this->load->helper('baz');

Answer 1

Yes you can store and load as follows (tested)

$this->load->helper('myHelperSubFolder/myHelperName');

Even in your autoload.php you can load a helper as follows

$autoload['helper'] = array('url','myHelpers/functions_helper'); // 'myHelpers' is the folder inside my helper folder and 'functions_helper' is my helper file.