+// Sanitize settings.
+$settings['piwik_enabled'] = (@$settings['piwik_enabled']) ? true : false;
+$settings['piwik_site_id'] = intval(@$settings['piwik_site_id']);
+$settings['piwik_url'] = strlen($settings['piwik_url']) ? $settings['piwik_url'] : '/piwik/';
+