WAPI Web Service PHP Classes Usage

<?php
// Load the classes constructed by wsdl2php
require_once 'WAPI.php';

// Define the SOAP options.
$a_SoapOptions = array
    (
    'encoding'  => 'UTF-8',
    'exception' => True, // Turn SOAPFaults into Exceptions so PHP can report upon them.
    'trace'     => True, // Turn on tracing so we can see EXACTLY what the headers and request/response are.
    );

// As we are going to need to display XML, use Tidy to make it pretty.
$a_TidyConfig = array
    (
    'indent'            => 4,
    'indent-attributes' => true,
    'input-xml'         => true,
    'output-xml'        => true,
    'wrap'              => 0,
    );
$o_Tidy = new Tidy;

$s_WsdlUrl = "https://api.ote.wildwestdomains.com/wswwdapi/wapi.asmx?wsdl";

// Use a try/catch loop to talk to the services.

try
    {
    // Create a login service.
    $o_WAPI = new WAPI($s_WsdlUrl, $a_SoapOptions);

    // Create "Describe" and "Credential" objects.
    $o_Describe = new Describe;
    $o_Describe->credential = new Credential;

    // Populate newly created objects.
    $o_Describe->sCLTRID              = '';
    $o_Describe->credential->account  = '';
    $o_Describe->credential->password = '';

    // Call the describe method of the service.
    $o_DescribeResponse = $o_WAPI->Describe($o_Describe);

    // Create a simple object containing the response as the service doesn't do this for us.
    $o_DescribeResults = simplexml_load_string($o_DescribeResponse->DescribeResult);

    // Display the results as they are.
    echo print_r($o_DescribeResults, True), PHP_EOL;

    }
catch(Exception $e)
    {
    echo PHP_EOL,

        // Show trace.
        'Request Headers', PHP_EOL,
        '---------------', PHP_EOL,
        $o_WAPI->__getLastRequestHeaders(), PHP_EOL,

        'Request', PHP_EOL,
        '-------', PHP_EOL,
        $o_Tidy->repairString($o_WAPI->__getLastRequest(), $a_TidyConfig), PHP_EOL, PHP_EOL,

        'Response Headers', PHP_EOL,
        '----------------', PHP_EOL,
        $o_WAPI->__getLastResponseHeaders(), PHP_EOL,

        'Response', PHP_EOL,
        '--------', PHP_EOL,
        $o_Tidy->repairString($o_WAPI->__getLastResponse(), $a_TidyConfig), PHP_EOL, PHP_EOL, PHP_EOL,

        // Show exception.
        'Exception', PHP_EOL,
        '---------', PHP_EOL,
        $e->getMessage(), PHP_EOL;
    }