_autoload.php

<?php
/*
	Set folder for all includes
*/
define('WSL_ROOT', __DIR__ . '/' );
define('WSL_ASSETS','assets/');
define('WSL_DATA','data/');
/*
	Load config definitions
*/
require_once WSL_ROOT . WSL_ASSETS . 'config.php';
/*
	Usage example:

		// notation: CamelCase

	Assets folder:

		./assets
			/php
				ClassName.php
				/NameSpace
					ClassName.php
					/NextGroup
						ClassNext.php

	#        
	# 1 with namespaces

		use NameSpace/ClassName;
			/ inside ClassName.php
				namespace NameSpace;

		use NameSpace/NextGroup/ClassNext;
			/ inside ClassNext.php
				namespace NameSpace/NextGroup;

	#
	# 2 without

			/ just call class

	#
	# then call class

		$class = new ClassName();

			or for class with no __construct

		ClassName::FunctionCall();

*/
spl_autoload_register(function (string $className) {
	$assets = WSL_ROOT . WSL_ASSETS . 'php/';
	$fileName = [
		// # 1 with namespaces
		$assets . str_replace('\\', '/', $className . '.php'),
		// # 2 without
		$assets . $className . '.php'
	];
	foreach ($fileName as $file) {
		if (file_exists($file)) {
			require_once $file;
			break;
		}
	}
});

?>