update_advanced.php

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<?php
$site = elgg_get_site_entity();
if (!$site) {
    throw new InstallationException("The system is missing an ElggSite 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();
}

$cache_symlinked = _elgg_is_cache_symlinked();
if ('on' === get_input('cache_symlink_enabled') && !$cache_symlinked) {
    if (!is_dir(elgg_get_root_path() . 'cache/')) {
        $cache_symlinked = symlink(elgg_get_cache_path() . 'views_simplecache/', elgg_get_root_path() . 'cache/');
    }
    if (!_elgg_is_cache_symlinked()) {
        unlink(elgg_get_root_path() . 'cache/');
        $cache_symlinked = false;
    }
    if (!$cache_symlinked) {
        register_error(elgg_echo('installation:cache_symlink:error'));
    }
}

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());

$regenerate_site_secret = get_input('regenerate_site_secret', false);
if ($regenerate_site_secret) {
    // if you cancel this even you should present a message to the user
    if (elgg_trigger_before_event('regenerate_site_secret', 'system')) {
        init_site_secret();
        elgg_reset_system_cache();
        elgg_trigger_after_event('regenerate_site_secret', 'system');

        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);