RSS feed for each category

Didn’t Otto said quite clearly:

“This must be in the loop. It will spit out the names of the categories, comma separated, with each name being linked to its feed.”

In trying to debug the code I put echo $cats and got Array, I put echo $num and got 1 (I have 7 categories), and inside the loop I did an echo of $cat and got nothing

I tried using the header code that TyskJohan posted, and it all works, but I get the following error message….

Warning: Missing argument 3 for get_category_rss_link(), called in /home/…/wp-content/themes/…/header.php on line 20 and defined in /home/…/wp-includes/feed-functions.php on line 115

I have really no idea what that means… Can anyone please help??

I wanted to have a list of feeds per category outside the loop. Therefore I did:

<?php
global $wpdb;
$cats = $wpdb->get_results("SELECT *
FROM $wpdb->categories ORDER BY cat_name");
foreach ($cats as $cat) {
echo '<li><a href="baseurl/category';
echo $cat->category_nicename.'/feed/">';
echo $cat->cat_name.'</a></li>';
}
?>

I whipped it in a plugin for anyone who cares
https://www.bos89.nl/1169/