echo "<pre>";

$WSDL_URL='https://servis.turkiye.gov.tr/services/g2g/kdgm/test/uetds?wsdl';

$username='999999';
$password='999999testtest';

$params = array(
    'login' => $username,
    'password' => $password,
    'trace' => 0,
    'exceptions' => 0,
    'location' => $WSDL_URL,
    'uri' => $WSDL_URL
);

$soap = new SoapClient(null, $params);

$RESULT = $soap->servisTest( 'HELLO' );
echo "<h1>ServisTEST Result:</h1>";
print_r($RESULT);

SoapFault Object
(
    [message:protected] => Client Error
    [string:Exception:private] =>
    [code:protected] => 0
    [file:protected] => /Applications/MAMP/htdocs/soap/test.php
    [line:protected] => 24
    [trace:Exception:private] => Array
        (
            [0] => Array
                (
                    [file] => /Applications/MAMP/htdocs/soap/test.php
                    [line] => 24
                    [function] => __call
                    [class] => SoapClient
                    [type] => ->
                    [args] => Array
                        (
                            [0] => servisTest
                            [1] => Array
                                (
                                    [0] => HELLO
                                )
                        )
                )
        )
    [previous:Exception:private] =>
    [faultstring] => Client Error
    [faultcode] => s:Client
)

$client = new SoapClient($wsdl, [
    'login' => $username,
    'password' => $password,
]);

$client = new SoapClient(
    'http://' . urlencode($login) . ':' . urlencode($password) . '@www.server.com/path/to/wsdl',
    [
        'login' => $login,
        'password' => $password
    ]
);