Jetpack::is_multi_network PHP Method

    public static function is_multi_network()
    {
        global $wpdb;
        // if we don't have a multi site setup no need to do any more
        if (!is_multisite()) {
            return false;
        }
        $num_sites = $wpdb->get_var("SELECT COUNT(*) FROM {$wpdb->site}");
        if ($num_sites > 1) {
            return true;
        } else {
            return false;
        }
    }

 public function test_sync_callable_whitelist()
 {
     // $this->setSyncClientDefaults();
     $callables = array('wp_max_upload_size' => wp_max_upload_size(), 'is_main_network' => Jetpack::is_multi_network(), 'is_multi_site' => is_multisite(), 'main_network_site' => Jetpack_Sync_Functions::main_network_site_url(), 'single_user_site' => Jetpack::is_single_user_site(), 'updates' => Jetpack::get_updates(), 'home_url' => Jetpack_Sync_Functions::home_url(), 'site_url' => Jetpack_Sync_Functions::site_url(), 'has_file_system_write_access' => Jetpack_Sync_Functions::file_system_write_access(), 'is_version_controlled' => Jetpack_Sync_Functions::is_version_controlled(), 'taxonomies' => Jetpack_Sync_Functions::get_taxonomies(), 'post_types' => Jetpack_Sync_Functions::get_post_types(), 'post_type_features' => Jetpack_Sync_Functions::get_post_type_features(), 'rest_api_allowed_post_types' => Jetpack_Sync_Functions::rest_api_allowed_post_types(), 'rest_api_allowed_public_metadata' => Jetpack_Sync_Functions::rest_api_allowed_public_metadata(), 'sso_is_two_step_required' => Jetpack_SSO_Helpers::is_two_step_required(), 'sso_should_hide_login_form' => Jetpack_SSO_Helpers::should_hide_login_form(), 'sso_match_by_email' => Jetpack_SSO_Helpers::match_by_email(), 'sso_new_user_override' => Jetpack_SSO_Helpers::new_user_override(), 'sso_bypass_default_login_form' => Jetpack_SSO_Helpers::bypass_login_forward_wpcom(), 'wp_version' => Jetpack_Sync_Functions::wp_version(), 'get_plugins' => Jetpack_Sync_Functions::get_plugins(), 'active_modules' => Jetpack::get_active_modules(), 'hosting_provider' => Jetpack_Sync_Functions::get_hosting_provider(), 'locale' => get_locale(), 'site_icon_url' => Jetpack_Sync_Functions::site_icon_url());
     if (is_multisite()) {
         $callables['network_name'] = Jetpack::network_name();
         $callables['network_allow_new_registrations'] = Jetpack::network_allow_new_registrations();
         $callables['network_add_new_users'] = Jetpack::network_add_new_users();
         $callables['network_site_upload_space'] = Jetpack::network_site_upload_space();
         $callables['network_upload_file_types'] = Jetpack::network_upload_file_types();
         $callables['network_enable_administration_menus'] = Jetpack::network_enable_administration_menus();
     }
     $this->sender->do_sync();
     foreach ($callables as $name => $value) {
         // TODO: figure out why _sometimes_ the 'support' value of
         // the post_types value is being removed from the output
         if ($name === 'post_types') {
             continue;
         }
         $this->assertCallableIsSynced($name, $value);
     }
     $whitelist_keys = array_keys($this->callable_module->get_callable_whitelist());
     $callables_keys = array_keys($callables);
     // Are we testing all the callables in the defaults?
     $whitelist_and_callable_keys_difference = array_diff($whitelist_keys, $callables_keys);
     $this->assertTrue(empty($whitelist_and_callable_keys_difference), 'Some whitelisted options don\'t have a test: ' . print_r($whitelist_and_callable_keys_difference, 1));
     // Are there any duplicate keys?
     $unique_whitelist = array_unique($whitelist_keys);
     $this->assertEquals(count($unique_whitelist), count($whitelist_keys), 'The duplicate keys are: ' . print_r(array_diff_key($whitelist_keys, array_unique($whitelist_keys)), 1));
 }