SOAP Server
<?php 
require_once 'SOAP/Client.php';
$client = new SOAP_Client('http://localhost/rot13.php');

// this namespace is the same as declared earlier
$options = array('namespace' => 'urn:SOAP_Server_rot13');

$rotated_string $client->call("rotate",
                                
$params = array("input" =>
                                                
"Rotate Me!"),
                                
$options);
print 
$rotated_string;
?>
Results
Ebgngr Zr!