This maybe should be posted on a php forum, but since it's WordPress related, I'm giving it a try here..
With this code, I'll get the total count of posts work a certain tag;
$term = get_term_by('slug', lizard, post_tag); echo $term->count;
How do I write if I would like to know how many posts there are in 10 different tags together?
I guess some kind of array?