start.php

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

// we need to register for shutdown before Symfony registers the session_write_close() function
// https://github.com/Elgg/Elgg/issues/9243
register_shutdown_function(function () {
    // There are cases where we may exit before this function is defined.
    // TODO move this to Application::create in 2.0
    if (function_exists('_elgg_shutdown_hook')) {
        _elgg_shutdown_hook();
    }
});

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;
}

require_once "$engine_dir/settings.php";

// This will be overridden by the DB value but may be needed before the upgrade script can be run.
$CONFIG->default_limit = 10;

require_once "$engine_dir/load.php";

// 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');