wordpress - How do I autoload PHP classes? -

i using classes wordpress , trying autoload them in functions.php file:

spl_autoload_register(function($class) {     include('classes/'.$class.'.php'); }); 

this classes directory looks like:

• classes/
  • project/
    • application.php
    • core.php
    • site.php
    • helpers.php
  • utils/
    • helpers.php
    • twig.php
  • views/
    • layout.php
    • modules.php
    • pages/
      • home.php

each class namespaced based on directory in. example:

$homeclass = new \views\pages\home();

when autoload classes, error:

php warning: include(classes/project\application.php): failed open stream: no such file or directory

obviously backslashes part of namespacing don't work in path. update function replace backslashes forward slashes this:

spl_autoload_register(function($class) {     include('classes/'.str_replace("\\", "/", $class).'.php'); }); 

but seems odd that required. missing something?

it's not odd @ all!

registering autoloaders using namespaces means denote directory structure common practice. recommend following psr-4 conventions, if you're far in refactor naming conventions, recommend using directory_separator constant php decide whether use '/' or '\', windows servers use latter, , linux servers use former.