engine/start.php

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<?php
/*
 * No settings means a fresh install
 */
if (!file_exists(dirname(__FILE__) . '/settings.php')) {
    header("Location: install.php");
    exit;
}

global $START_MICROTIME;
$START_MICROTIME = microtime(true);

global $CONFIG;
if (!isset($CONFIG)) {
    $CONFIG = new stdClass;
}
$CONFIG->boot_complete = false;

$lib_dir = dirname(__FILE__) . '/lib/';

// Load the bootstrapping library
$path = $lib_dir . 'elgglib.php';
if (!include_once($path)) {
    echo "Could not load file '$path'. Please check your Elgg installation for all required files.";
    exit;
}

// Load the system settings
if (!include_once(dirname(__FILE__) . "/settings.php")) {
    $msg = 'Elgg could not load the settings file. It does not exist or there is a file permissions issue.';
    throw new InstallationException($msg);
}


// load the rest of the library files from engine/lib/
$lib_files = array(
    'access.php', 'actions.php', 'admin.php', 'annotations.php', 'cache.php',
    'calendar.php', 'configuration.php', 'cron.php', 'database.php',
    'entities.php', 'export.php', 'extender.php', 'filestore.php', 'group.php',
    'input.php', 'languages.php', 'location.php', 'mb_wrapper.php',
    'memcache.php', 'metadata.php', 'metastrings.php', 'navigation.php',
    'notification.php', 'objects.php', 'opendd.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',
    'web_services.php', 'widgets.php', 'xml.php', 'xml-rpc.php',
    
    // backward compatibility
    'deprecated-1.7.php', 'deprecated-1.8.php',
);

foreach ($lib_files as $file) {
    $file = $lib_dir . $file;
    elgg_log("Loading $file...");
    if (!include_once($file)) {
        $msg = "Could not load $file";
        throw new InstallationException($msg);
    }
}

// Connect to database, load language files, load configuration, init session
// Plugins can't use this event because they haven't been loaded yet.
elgg_trigger_event('boot', 'system');

// Load the plugins that are active
elgg_load_plugins();

// @todo move loading plugins into a single boot function that replaces 'boot', 'system' event
// and then move this code in there.
// This validates the view type - first opportunity to do it is after plugins load.
$view_type = elgg_get_viewtype();
if (!elgg_is_valid_view_type($view_type)) {
    elgg_set_viewtype('default');
}

// @todo deprecate as plugins can use 'init', 'system' event
elgg_trigger_event('plugins_boot', 'system');

// Complete the boot process for both engine and plugins
elgg_trigger_event('init', 'system');

$CONFIG->boot_complete = true;

// System loaded and ready
elgg_trigger_event('ready', 'system');

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