public static function getDefaultWsdlOptions()
    {
        return [
            self::WSDL_AUTHENTICATION => null,
            self::WSDL_CACHE_WSDL => WSDL_CACHE_NONE,
            self::WSDL_CLASSMAP => null,
            self::WSDL_COMPRESSION => null,
            self::WSDL_CONNECTION_TIMEOUT => null,
            self::WSDL_ENCODING => null,
            self::WSDL_EXCEPTIONS => true,
            self::WSDL_FEATURES => SOAP_SINGLE_ELEMENT_ARRAYS | SOAP_USE_XSI_ARRAY_TYPE,
            self::WSDL_LOCAL_CERT => null,
            self::WSDL_LOCATION => null,
            self::WSDL_LOGIN => null,
            self::WSDL_PASSPHRASE => null,
            self::WSDL_PASSWORD => null,
            self::WSDL_PROXY_HOST => null,
            self::WSDL_PROXY_LOGIN => null,
            self::WSDL_PROXY_PASSWORD => null,
            self::WSDL_PROXY_PORT => null,
            self::WSDL_SOAP_VERSION => null,
            self::WSDL_SSL_METHOD => null,
            self::WSDL_STREAM_CONTEXT => null,
            self::WSDL_STYLE => null,
            self::WSDL_TRACE => true,
            self::WSDL_TYPEMAP => null,
            self::WSDL_URL => null,
            self::WSDL_URI => null,
            self::WSDL_USE => null,
            self::WSDL_USER_AGENT => null,
        ];
    }