<?php

$username='xxx';
$password='yyy';
$WSDL_URL='https://myserver.com/mywebservice?wsdl';
$auth = base64_encode($username . ":" . $password);

$Header = array(
  'http'=>array(
    'method'=> "POST",
    'header'=> "Authorization: Basic $authrn".
               "Content-Type: text/xmlrn".
               "cache-control: no-cache"
  )
);

$HeaderContext = stream_context_create($Header);

$soap = new SoapClient(NULL, array(
    'login'        => $username,
    'password'     => $password,
    'trace'        => 1,
    'exceptions'   => 0,
    'location'     => $WSDL_URL,
    'uri'          => $WSDL_URL,
    'cache_wsdl'   => WSDL_CACHE_NONE,
    'stream_context' => $HeaderContext
));

$response = $soap->serviceECHO( 'Hello' );
print_r($response);

$username='xxx';
$password='yyy';
$WSDL_URL='https://myserver.com/mywebservice?wsdl';
$auth = base64_encode($username . ":" . $password);

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => $WSDL_URL,
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => "
<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:uet='http://myserver.com/'>
   <soapenv:Header/>
   <soapenv:Body>
      <uet:testMsj>Hello</uet:testMsj>
   </soapenv:Body>
</soapenv:Envelope>",
  CURLOPT_HTTPHEADER => array(
    "Content-Type: text/xml",
    "cache-control: no-cache",
    "Authorization: Basic $auth"
  ),
));

$xmlResponse = curl_exec($curl);
print_r($xmlResponse);