首先定义一个函数，通过给定的类别ID返回类别的第一篇帖子，例如：
function get_category_post($cat_id){
$post_args = array(
\'numberposts\' => 1,
\'category\' => $cat_id,
\'fields\' => \'ids\'
);
$posts = get_posts($post_args);
return $posts[0];
}
然后，一旦拥有该功能，您就可以这样使用它：
function outputXMLFeed()
{
echo \'<?xml version="1.0"?>\';
echo \'<items>\';
$args=array(
\'orderby\' => \'name\',
\'order\' => \'ASC\'
);
$categories=get_categories($args);
foreach($categories as $category) {
echo \'<item>\';
echo \'<catID>\' . $category->term_id . \'</catID>\';
echo \'<catname>\' . $category->name . \'</catname>\';
echo \'<postcount>\' . $category->category_count . \'</postcount>\';
echo \'<slug>\' . $category->slug . \'</slug>\';
echo \'<featured>\' . get_the_post_thumbnail(get_category_post($category->term_id) , $size = \'post-thumbnail\') . \'</featured>\';
echo \'</item>\';
}
echo \'</items>\';
}
add_action(\'init\', \'add_my_feed\');
function add_my_feed( ) {
add_feed("myFeed", "outputXMLFeed");
}
