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<?php
/**
* Bootstraps and starts the Elgg engine.
*
* This file loads the full Elgg engine, checks the installation
* state, then emits a series of events to finish booting Elgg:
* - {@elgg_event boot system}
* - {@elgg_event plugins_boot system}
* - {@elgg_event init system}
*
* If Elgg is uninstalled, the browser will be redirected to an
* installation page.
*
* @see install.php
* @package Elgg.Core
* @subpackage Core
*/
/*
* No settings means a fresh install
*/
if (!file_exists(dirname(__FILE__) . '/settings.php')) {
header("Location: install.php");
exit;
}
/**
* The time with microseconds when the Elgg engine was started.
*
* @global float
*/
global $START_MICROTIME;
$START_MICROTIME = microtime(true);
/**
* Configuration values.
*
* The $CONFIG global contains configuration values required
* for running Elgg as defined in the settings.php file. The following
* array keys are defined by core Elgg:
*
* Plugin authors are encouraged to use get_config() instead of accessing the
* global directly.
*
* @see get_config()
* @see engine/settings.php
* @global stdClass $CONFIG
*/
global $CONFIG;
if (!isset($CONFIG)) {
$CONFIG = new stdClass;
}
$lib_dir = dirname(__FILE__) . '/lib/';
/**
* The minimum required libs to bootstrap an Elgg installation.
*
* @var array
*/
$required_files = array(
'elgglib.php', 'views.php', 'access.php', 'system_log.php', 'export.php',
'sessions.php', 'languages.php', 'input.php', 'install.php', 'cache.php', 'output.php'
);
// include bootstraping libs
foreach ($required_files as $file) {
$path = $lib_dir . $file;
if (!include($path)) {
echo "Could not load file '$path'. "
. 'Please check your Elgg installation for all required files.';
exit;
}
}
// Register the error handler
set_error_handler('__elgg_php_error_handler');
set_exception_handler('__elgg_php_exception_handler');
/**
* Load the system settings
*/
if (!include_once(dirname(__FILE__) . "/settings.php")) {
$msg = elgg_echo('InstallationException:CannotLoadSettings');
throw new InstallationException($msg);
}
// load the rest of the library files from engine/lib/
$lib_files = array(
// these need to be loaded first.
'database.php', 'actions.php',
'admin.php', 'annotations.php', 'api.php', 'cache.php',
'calendar.php', 'configuration.php', 'cron.php', 'entities.php',
'export.php', 'extender.php', 'filestore.php', 'group.php',
'input.php', 'location.php', 'mb_wrapper.php',
'memcache.php', 'metadata.php', 'metastrings.php', 'notification.php',
'objects.php', 'opendd.php', 'pagehandler.php',
'pageowner.php', 'pam.php', 'plugins.php', 'query.php',
'relationships.php', 'river.php', 'sites.php', 'social.php',
'statistics.php', 'system_log.php', 'tags.php', 'usersettings.php',
'users.php', 'version.php', 'widgets.php', 'xml.php', 'xml-rpc.php'
);
foreach($lib_files as $file) {
$file = $lib_dir . $file;
elgg_log("Loading $file...");
if (!include_once($file)) {
$msg = sprint(elgg_echo('InstallationException:MissingLibrary'), $file);
throw new InstallationException($msg);
}
}
// prep core classes to be autoloadable
spl_autoload_register('__elgg_autoload');
elgg_register_classes(dirname(__FILE__).'/classes');
// confirm that the installation completed successfully
verify_installation();
// Autodetect some default configuration settings
set_default_config();
// Trigger boot events for core. Plugins can't hook
// into this because they haven't been loaded yet.
trigger_elgg_event('boot', 'system');
// Load the plugins that are active
load_plugins();
trigger_elgg_event('plugins_boot', 'system');
// Trigger system init event for plugins
trigger_elgg_event('init', 'system');
// Regenerate the simple cache if expired.
// Don't do it on upgrade because upgrade does it itself.
// @todo - move into function and perhaps run off init system event
if (!defined('upgrading')) {
$view = get_input('view', 'default');
$lastupdate = datalist_get("simplecache_lastupdate_$view");
$lastcached = datalist_get("simplecache_lastcached_$view");
if ($lastupdate == 0 || $lastcached < $lastupdate) {
elgg_view_regenerate_simplecache($view);
}
// needs to be set for links in html head
$CONFIG->lastcache = $lastcached;
}
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