PHP - The First Web Services

This is my first web service I try to do that successfully executed:
index.php

<?php

require_once "nusoap.php";

$server = new soap_server;

$server->register('hello');

function hello($name){

    return 'Hello, '.$name.' From Soap Server';

}

$HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';

$server->service($HTTP_RAW_POST_DATA);

?>

While the client code is:

<?php

require_once 'nusoap.php';

$client = new SoapClient(

    null,

    array(

        'location' => 'http://localhost/index.php',

        'uri' => 'http://localhost:80',

        'soap_version' => '0.9.5',

    )

);

$result = $client->hello('Barack Obama');

print_r($result);

?>

PHP - The First Web Services