可以在应用逻辑修改类别之前添加条件语句。例如，我添加了一个检查，如果我们不在类别存档页面上，它将退出并返回未修改的类别列表：

// Add the filter to \'the_category\' tag.
add_filter( \'the_category\', \'the_category_filter\', 10, 2 );
function the_category_filter( $thelist, $separator = \' \' ) {

    // Bail if this is not the category archive page.
    // https://developer.wordpress.org/reference/functions/is_tax/
    if ( ! is_tax( \'category\' ) ) {
        return $thelist;
    }

    // list the IDs of the categories to exclude
    $exclude = array(4,5);
    // create an empty array
    $exclude2 = array();

    // loop through the excluded IDs and get their actual names
    foreach($exclude as $c) {
             // store the names in the second array
             $exclude2[] = get_cat_name($c);
    }

    // get the list of categories for the current post
    $cats = explode($separator,$thelist);
    // create another empty array
    $newlist = array();

    foreach($cats as $cat) {
        // remove the tags from each category
        $catname = trim(strip_tags($cat));

        // check against the excluded categories
        if(!in_array($catname,$exclude2))

        // if not in that list, add to the new array
        $newlist[] = $cat;
    }

    // return the new, shortened list
    return implode( $separator, $newlist );
}