load.php

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<?php
$lib_dir = __DIR__ . "/lib";

$autoloader_setup = (require_once "$lib_dir/autoloader.php");

$autoload_path = dirname(__DIR__) . '/vendor/autoload.php';
$autoload_available = include_once($autoload_path);
if (!$autoload_available) {
    die("Couldn't include '$autoload_path'. Did you run `composer install`?");
}

// set up autoloading and DIC
_elgg_services();

// load the rest of the library files from engine/lib/
// All on separate lines to make diffs easy to read + make it apparent how much
// we're actually loading on every page (Hint: it's too much).
$lib_files = array(
    // Needs to be loaded first to correctly bootstrap
    'elgglib.php',
    
    // The order of these doesn't matter, so keep them alphabetical
    'access.php',
    'actions.php',
    'admin.php',
    'annotations.php',
    'cache.php',
    'comments.php',
    'configuration.php',
    'cron.php',
    'database.php',
    'entities.php',
    'extender.php',
    'filestore.php',
    'friends.php',
    'group.php',
    'input.php',
    'languages.php',
    'mb_wrapper.php',
    'memcache.php',
    'metadata.php',
    'metastrings.php',
    'navigation.php',
    'notification.php',
    'objects.php',
    'output.php',
    'pagehandler.php',
    'pageowner.php',
    'pam.php',
    'plugins.php',
    'private_settings.php',
    'relationships.php',
    'river.php',
    'sessions.php',
    'sites.php',
    'statistics.php',
    'system_log.php',
    'tags.php',
    'user_settings.php',
    'users.php',
    'upgrade.php',
    'views.php',
    'widgets.php',

    // backward compatibility
    'deprecated-1.7.php',
    'deprecated-1.8.php',
    'deprecated-1.9.php',
    'deprecated-1.10.php',
    'deprecated-1.11.php',
    'deprecated-1.12.php',
);

// isolate global scope
call_user_func(function () use ($lib_dir, $lib_files, $autoloader_setup) {

    $setups = array();

    // include library files, capturing setup functions
    foreach ($lib_files as $file) {
        $setup = (require_once "$lib_dir/$file");

        if ($setup instanceof Closure) {
            $setups[$file] = $setup;
        }
    }

    $events = _elgg_services()->events;
    $hooks = _elgg_services()->hooks;

    // run setups
    $autoloader_setup($events, $hooks);
    foreach ($setups as $func) {
        $func($events, $hooks);
    }
});