<?php
spl_autoload_register(function($className)
{
    $ds = DIRECTORY_SEPARATOR;

    $vendor = __DIR__."{$ds}..{$ds}vendor{$ds}";
    $loadable = array(
        'lessc' => "lessphp{$ds}lessc.inc.php",
    );

    isset($loadable[$className]) ? require $vendor.$loadable[$className] : '';

}, false);