<?php
$ns = 'http://tempuri.org ';
$header = [

'Username'=>'username',
'Password'=>'Password'
];
$body = [
'parametre1'=>$deger1,
'parametre2'=>$deger2
];

$SOAPheader = new SOAPHeader($ns, 'AuthHeader', $header)
$SOAPclient = new SOAPClient('....?wsdl');
$SOAPclient->__setSoapHeader($SOAPclient );
$SOAPclient->__call('metodadi',$body);
?>