XML to array conversion using recursive programing method

how to convert xml to array

$site_url = site_url().'/xmltophp/jobsfeed.xml';
//echo $site_url;
$xml = simplexml_load_file($site_url);
$ar = xml2array($xml);

function xml2array($xml) {
    $arr = array();
    foreach ($xml->children() as $r) {
        if (count($r->children()) == 0) {
            $arr[$r->getName()] = strval($r);
        } else {
            $arr[$r->getName()][] = xml2array($r);
        }
    }
    return $arr;
}

use as 
$ar['job']['title']