/** * start() * * @return void **/ static function start() { if (strpos($_SERVER['HTTP_HOST'], '/') !== false) { trigger_error(sprintf('%s is not a valid hostname', $_SERVER['HTTP_HOST']), E_USER_ERROR); } self::$base_dir = defined('SUBDOMAIN_INSTALL') && SUBDOMAIN_INSTALL ? WP_CONTENT_DIR . '/cache/' . $_SERVER['HTTP_HOST'] : WP_CONTENT_DIR . '/cache'; }