How to read a tag with two attributes

I have an xml rss with a special tag I do not know how to read the second part, in this case the subcategory

XML RSS:

<?xml version="1.0" encoding="UTF-8"?>

<channel>
    <category text="Category">
    <category text="Subcategory"/>
    </category>
</channel>

</rss>

PHP

//this gives the category
$category = $feed->channel->category->attributes(); 
echo $category . '<br>';

//I tried this but only gives category and I need subcategory too
foreach ($feed->channel->category->attributes() as $item) { 
    echo $item . '<br>';
}