autoloader.php

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<?php
function _elgg_services() {
    static $provider;
    if (null === $provider) {
        $provider = _elgg_create_service_provider();
    }
    return $provider;
}

function _elgg_create_service_provider() {
    // manually load classes needed for autoloading
    $dir = dirname(dirname(__FILE__)) . '/classes';
    foreach (array('Elgg_ClassMap', 'Elgg_ClassLoader', 'Elgg_AutoloadManager') as $class) {
        if (!class_exists($class)) {
            $file = "{$dir}/" . strtr($class, '_\\', '//') . ".php";
            include $file;
            if (!class_exists($class, false)) {
                throw new RuntimeException("Could not load {$class} in {$file}.");
            }
        }
    }

    $loader = new Elgg_ClassLoader(new Elgg_ClassMap());
    // until the cache can be loaded, just setup PSR-0 autoloading
    // out of the classes directory. No need to build a full map.
    $loader->addFallback($dir);
    $loader->register();
    $manager = new Elgg_AutoloadManager($loader);

    return new Elgg_Di_ServiceProvider($manager);
}

function _elgg_load_autoload_cache() {
    $manager = _elgg_services()->autoloadManager;
    $manager->setStorage(elgg_get_system_cache());
    if (! $manager->loadCache()) {
        $manager->addClasses(dirname(dirname(__FILE__)) . '/classes');
    }
}

function _elgg_save_autoload_cache() {
    _elgg_services()->autoloadManager->saveCache();
}

function _elgg_delete_autoload_cache() {
    _elgg_services()->autoloadManager->deleteCache();
}

function elgg_get_class_loader() {
    return _elgg_services()->autoloadManager->getLoader();
}

function elgg_register_classes($dir) {
    _elgg_services()->autoloadManager->addClasses($dir);
}

function elgg_register_class($class, $location) {
    _elgg_services()->autoloadManager->setClassPath($class, $location);
    return true;
}

// set up autoloading and DIC
_elgg_services();

_elgg_services()->events->registerHandler('shutdown', 'system', '_elgg_save_autoload_cache', 1000);
_elgg_services()->events->registerHandler('upgrade', 'all', '_elgg_delete_autoload_cache');