engine.php

 public function subscribeNewsLetter($data, $type = 'subscribe',$engine_username,$engine_password,$engine_url)
    {

        ini_set('soap.wsdl_cache_enabled', '0');
        try {
            $wsdl = $engine_url;
            $client = new \SoapClient(
                $wsdl,
                [
                    'login'    => $engine_username,
                    'password' => $engine_password,
                    'trace'    => 0,
                ]
            );
            $msg = '';
            switch ($type) {
                case 'subscribe':
                    $msg =  $client->Subscriber_set($data);
                    break;
                case 'unsubscribe':
                    $msg = $client->Subscriber_unsubscribe($data['email']);
                    break;
            }
            return ['status'=>true,'message'=>$msg];
        } catch (\SoapFault $exception) {
            set_error_handler('var_dump', 0); // Never called because of empty mask.
            @trigger_error("");
            restore_error_handler();
            return ['status'=>false,'message'=>$exception->getMessage()];
        }
    }