start.php

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<?php
global $START_MICROTIME;
$START_MICROTIME = microtime(true);

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

$engine_dir = dirname(__FILE__);

// No settings means a fresh install
if (!is_file("$engine_dir/settings.php")) {
    header("Location: install.php");
    exit;
}

if (!is_readable("$engine_dir/settings.php")) {
    echo "The Elgg settings file exists but the web server doesn't have read permission to it.";
    exit;
}

include_once("$engine_dir/settings.php");

$lib_dir = "$engine_dir/lib";

require_once("$lib_dir/autoloader.php");
require_once("$lib_dir/elgglib.php");

// 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(
    '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',
);

foreach ($lib_files as $file) {
    require_once("$lib_dir/$file");
}

// 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.
$viewtype = elgg_get_viewtype();
if (!elgg_is_registered_viewtype($viewtype)) {
    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');