Print specific element consuming SOAP with XML - php

Question

I'm using the integrated SOAP client in PHP 5.3 and I've tested with this web service: http://www.webservicex.net/globalweather.asmx
I'm calling this method 'GetWeather' and the XML request looks like this:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<GetWeather xmlns="http://www.webserviceX.NET">
<CityName>string</CityName>
<CountryName>string</CountryName>
</GetWeather>
</soap:Body>
</soap:Envelope>
and response XML is like this:
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Body>
<GetWeatherResponse xmlns="http://www.webserviceX.NET">
<GetWeatherResult>string</GetWeatherResult>
</GetWeatherResponse>
</soap:Body>
</soap:Envelope>
So far I'm getting successfully the array with this code:
<?php
$client = new SoapClient('http://www.webservicex.net/globalweather.asmx?WSDL');
$result = $client->GetWeather(array('CityName' => 'Barcelona', 'CountryName' => 'Spain'));
print_r ($result);
How can I print specific element, let's say the value of the CityName?
So when I want to print the city like this:
echo '<div> ' . $city . '</div>';
How do I get the value of the CityName?