public static function getCacheUrl() { if (empty(self::$_CFAO_CACHE_URL)) { $cache_url = WP_CONTENT_URL . '/cfao-cache/' . $_SERVER['HTTP_HOST'] . '/js/'; self::$_CFAO_CACHE_URL = trailingslashit(apply_filters('cfao_script_cache_url', $cache_url)); } return self::$_CFAO_CACHE_URL; }