I try to read my iTunes RSS. I can read title, even itunes:subtitle but I have problems with the tag image.
FEED:
You could use SimpleXML. Because the image element has a namespace prefix (itunes), you have to use the children method to pass the namespace URL, then call the attributes method:
$feed = simplexml_load_file('http://www.myWeb/rss.xml');
foreach ($feed->channel as $channel) {
$ns_itunes = $channel->children('http://www.itunes.com/dtds/podcast-1.0.dtd');
echo $ns_itunes->image->attributes();
}