Category Menu Ancestors

if ( ! function_exists( 'digimag_top_categories' ) ) :
function digimag_top_categories() {
    $list_args = 'sort_column=name&sort_order=asc&style=list&depth=0&hierarchical=true&title_li=0&hide_empty=1&echo=0';
    $catlist = wp_list_categories($list_args);
    if ( is_category() ) {
        //Get the active category id
        global $cat;
        $curr_cat = get_category($cat);
        $catid = $curr_cat->cat_ID;
        //Find the top level id and number of levels
        while ($catid){
            $curr_cat = get_category($catid);
            $catid = $curr_cat->category_parent;
            $id[] = $curr_cat->cat_ID;
        }
        //How many levels more than two set hierarchical ancestor?
        //Count from 1 array from 0 : 1:0=Current 2:1=Parent >2:1 all Ancestors
        if( count($id) > 2){
            $max=count($id)-1; //Array elements zero based = count - 1
            $extra_class='current-cat-ancestor';
            for ( $counter = 1; $counter <= $max; $counter ++) {
                $cat_ancestor_class = 'cat-item cat-item-'. $id[$counter];
                $amended_class = $cat_ancestor_class . ' ' . $extra_class;
                $catlist = str_replace($cat_ancestor_class, $amended_class, $catlist );
            }
        }
    }
    $menu = str_replace( array( "\r", "\n", "\t" ), '', $catlist );
    echo $menu;
}
endif;