Highlight current category in wp_list_categories

by

This will add a current-cat class to any / all categories connected to the post, not jut one.

Add this to functions.php

function tax_cat_active( $output, $args ) {

  if(is_single()){
    global $post;

    $terms = get_the_terms( $post->ID, $args['taxonomy'] );
    foreach( $terms as $term )
        if ( preg_match( '#cat-item-' . $term ->term_id . '#', $output ) )
            $output = str_replace('cat-item-'.$term ->term_id, 'cat-item-'.$term ->term_id . ' current-cat', $output);
  }

  return $output;
}
add_filter( 'wp_list_categories', 'tax_cat_active', 10, 2 );

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