Need PHP code to extract data from XML

Hi.
I’m trying to extract a data(phone number) from XML file using PHP code.

Here is my XML (pretty simple)
<?xml version=”1.0″ encoding=”UTF-8″?>
<list>
<city>oakland</city>
<phone>510.444.6500</phone>

<city>fremont</city>
<phone>510.792.9410</phone>

<city>hayward</city>
<phone>510.792.9410</phone>
</list>

I want to extract phone number by page title.
city name is page title.

Here is some code what I’m did.. but did not work..

<?php
$xml = new DOMDocument();
$xml->loadXML(‘phone-list.xml’);
$city = $xml->getElementsByTagName(‘city’);
$phone = $xml->getElementsByTagName(‘phone’);
$title = get_the_title();
if ($title == $city) {
echo $phone;
}
?>

Any idea??

Thanks!