update_advanced.php

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<?php
if ($site = elgg_get_site_entity()) {
    if (!($site instanceof ElggSite)) {
        throw new InstallationException("Passing a non-ElggSite to an ElggSite constructor!");
    }

    $site->url = rtrim(get_input('wwwroot', '', false), '/') . '/';

    datalist_set('path', sanitise_filepath(get_input('path', '', false)));
    $dataroot = sanitise_filepath(get_input('dataroot', '', false));

    // check for relative paths
    if (stripos(PHP_OS, 'win') === 0) {
        if (strpos($dataroot, ':') !== 1) {
            $msg = elgg_echo('admin:configuration:dataroot:relative_path', array($dataroot));
            register_error($msg);
            forward(REFERER);
        }
    } else {
        if (strpos($dataroot, '/') !== 0) {
            $msg = elgg_echo('admin:configuration:dataroot:relative_path', array($dataroot));
            register_error($msg);
            forward(REFERER);
        }
    }

    datalist_set('dataroot', $dataroot);

    if ('on' === get_input('simplecache_enabled')) {
        elgg_enable_simplecache();
    } else {
        elgg_disable_simplecache();
    }

    set_config('simplecache_minify_js', 'on' === get_input('simplecache_minify_js'), $site->getGUID());
    set_config('simplecache_minify_css', 'on' === get_input('simplecache_minify_css'), $site->getGUID());

    if ('on' === get_input('system_cache_enabled')) {
        elgg_enable_system_cache();
    } else {
        elgg_disable_system_cache();
    }

    set_config('default_access', get_input('default_access', ACCESS_PRIVATE), $site->getGUID());

    $user_default_access = ('on' === get_input('allow_user_default_access'));
    set_config('allow_user_default_access', $user_default_access, $site->getGUID());

    $debug = get_input('debug');
    if ($debug) {
        set_config('debug', $debug, $site->getGUID());
    } else {
        unset_config('debug', $site->getGUID());
    }

    // allow new user registration?
    $allow_registration = ('on' === get_input('allow_registration', false));
    set_config('allow_registration', $allow_registration, $site->getGUID());

    // setup walled garden
    $walled_garden = ('on' === get_input('walled_garden', false));
    set_config('walled_garden', $walled_garden, $site->getGUID());

    if ('on' === get_input('https_login')) {
        set_config('https_login', 1, $site->getGUID());
    } else {
        unset_config('https_login', $site->getGUID());
    }

    $regenerate_site_secret = get_input('regenerate_site_secret', false);
    if ($regenerate_site_secret) {
        init_site_secret();
        elgg_reset_system_cache();

        system_message(elgg_echo('admin:site:secret_regenerated'));

        elgg_delete_admin_notice('weak_site_key');
    }

    if ($site->save()) {
        system_message(elgg_echo("admin:configuration:success"));
    } else {
        register_error(elgg_echo("admin:configuration:fail"));
    }

    forward(REFERER);
}