I needed a category listing in my posts page and I want the current category to be highlighted. I enabled the 'All' category, so consequently, I want the 'All' also to be highlighted when I'm viewing the posts page. So I used the codex and got the following script running.
My script is:
<cat> <ul> <?php wp_list_categories('show_option_all=All&hide_empty=0&title_li=¤t_category=All'); ?> </ul> </cat>
Do I have to run an IF conditional on my archive.php file to get the category ID and highlight it using CSS class 'cat.current-cat'? How do I do it if the category is 'All' since the 'All' doesn't exactly have a category ID?