Autoload function

What is the best way to make autoload incldues?
such as:
       include_once (DIR_LIB. "interface / components / TinyMce.php");

Thanks a lot for help!

"Best Way" is subjective and depends on a bunch of factors that require more time to explain that I have time for (Sorry   ), but it mostly boils down to one or more of the following.

• A full path like you use above
  
• A custom autoload function attached to the system by spl_autoload_register
  
• A PSR-4 autoloader of the type usually made available to components installed with Composer
  

Both the second and third option require a logical file system structure and/or using namespaces and "use" commands in your PHP files.