Sample requires curl see code below:

function callWebServicePost($host, $url, $payload, $user, $password) {

$header[] = "Host: ". $host;
$header[] = "Content-type: text/xml";
$header[] = "Content-length: ".strlen($payload) . "\r\n";
$header[] = $payload;

$session = curl_init($url);

 // Tell curl to use HTTP POST
curl_setopt ($session, CURLOPT_POST, true);
curl_setopt($session, CURLOPT_CONNECTTIMEOUT,30);
// Tell curl that this is the body of the POST
curl_setopt ($session, CURLOPT_POSTFIELDS, '');

// Tell curl not to return headers, but do return the response
curl_setopt($session, CURLOPT_HEADER, true);
// Display headers
curl_setopt($session, CURLOPT_VERBOSE, true);
// Display communication with server
curl_setopt($session, CURLOPT_RETURNTRANSFER, true);
// Return data instead of display to std out
curl_setopt($session, CURLOPT_HTTPHEADER, $header );
 // headers from above

// provide credentials if they're established
if(!empty($user) && !empty($password))
      curl_setopt($session, CURLOPT_USERPWD, $user . ":" . $password);
    // tell cURL to graciously accept an SSL certificate if presented
    if(ereg("^(https)",$url))
          curl_setopt($session, CURLOPT_SSL_VERIFYPEER,false);
    $result = curl_exec($session);

    curl_close($session);

    return $result;
}