PHP Autoloader - Includes files for classes that are instantiated.

autoloader.php

<?php

  spl_autoload_register(function($class){
	$directorys = array(PATH.VERSION.MODULES, INSTALL.MODULES, INSTALL.THEME.'modules/');
        foreach($directorys as $directory):
            if(file_exists($directory.'class.'.$class.'.php')):
                require($directory.'class.'.$class.'.php');
		return;
            endif;
        endforeach;
	});

?>