php opening itunes tags an rss feed

i need opening itunes tags an rss feed controlling php. i've used simplepie before podcast feeds, nonetheless i'm certain itunes tags controlling it. there proceed simplepie there improved way?

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okay i attempted rudimentary xml.

all (the formula below) seems work

$feed = simplexml_load_file('http://sbhosting.com/feed/');
$channel = $feed->channel;
$channel_itunes = $channel->children('http://www.itunes.com/dtds/podcast-1.0.dtd');
$summary = $channel_itunes->summary;
$subtitle = $channel_itunes->subtitle;
$category = $channel_itunes->category;
$owner = $channel_itunes->owner->name;

now i need itunes categories. seem represented several ways.
in box i follow xml:

<itunes:category text="technology"/>
<itunes:category text="technology">
  <itunes:category text="software how-to"/>
</itunes:category> 

i design means problem something this:

$category_text = $channel_itunes->category['text'];

but does seem work.

i've seen ways paint problem i unequivocally don't know get.

for example:

technology
business
education

is media thing itunes thing both?

thanks your help.
g