Web service soap wsdl run on PHP

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PHP

Hi Guys,
I am trying to call a web service using php,
I am wrestling two days with an issue, searching on the internet didn't help, I have tried to run simillar examples but I receice an empty browser (without any errors but still with no content)

I am using wamp server and my php code is very simple

<pre><?php

  try {
            $wsdl_url = "http://**********file?WSDL";
            $client = new SOAPClient($wsdl_url);
            $param = array(
                'Name' => "Greece",
            );
            $return = $client->GetCitiesByCountry($param);
    var_dump($return);
            print_r(array_values($return));
            echo $return;
           
        } catch (Exception $e) {
            echo "Exception occured: " . $e;
        }

?>

when I run it I receive an empty browser and nothing else (no errors, nothing) if I writte any other php code it runs properly.

Please i will be greatfull for any help or advise!!

Thank all of you for your time,
Friendly,
Jason

What I have tried:

I tried to and as following but still nothing (in visual studio at C# I run it and worked properly but in php not)

$wsdl_url = "http://**********file?WSDL";
            $client = new SOAPClient($wsdl_url);
            $param = array(
                'Name' => "Greece",
            );
            $return = $client->GetCitiesByCountry($param);
    var_dump($return);
            print_r(array_values($return));
            echo $return;