How to make a variable from one controller available in another?

Question

PHP

That's the whole question. There is Opencart 2.1.0.1 and there is such a thing that variables from some controllers are not available in others. Is there any easy way around this? without creating global variables?

Answer 1

libraries?
https://ellislab.com/codeigniter/user-guide/genera...
See examples in the system\library folder there. For example session.
Loaded in framework.php

// Library Autoload
if ($config->has('library_autoload')) {
  foreach ($config->get('library_autoload') as $value) {
    $loader->library($value);
  }
}

Set in default.php:

// Autoload Libraries
$_['library_autoload']     = array();