/** * Use MailChimp API key to try to grab corresponding user profile to check validity of key * * @param string * @return bool */ function li_check_invalid_api_key($api_key) { $gr = new LI_GetResponse($api_key); $ping = $gr->ping(); if (!empty($ping)) { $invalid_key = FALSE; } else { $invalid_key = TRUE; } return $invalid_key; }