"Keine Sub-Kategorien im Loop" funktioniert nicht mehr

if ( !function_exists('fb_filter_child_cats') ) {
     function fb_filter_child_cats( $cats ) {
     global $wp_query, $wpdb;
      
     if ( is_category('') ) {
      
     // get children ID's
     if ( $excludes = get_categories( "child_of=" . $wp_query->get('cat') ) ) {
      
     // set array with ID's
     foreach ( $excludes as $key => $value ) {
     $exclude[] = $value->cat_ID;
     }
     }
      
     // remove child cats
     if ( isset($exclude) && is_array($exclude) ) {
     $cats .= " AND " . $wpdb->prefix . "term_taxonomy.term_id NOT IN (" . implode(",", $exclude) . ") ";
     }
     }
      
     return $cats;
     }
      
     if ( !is_admin() ) {
     add_filter( 'posts_where', 'fb_filter_child_cats' );
     }
     }

<?php 


// Current version of K2
define('K2_CURRENT', '1.0-RC7');


// Is this MU or no?
define('K2_MU', (isset($wpmu_version) or (strpos($wp_version, 'wordpress-mu') !== false)));


// Define our folders for Wordpress
define('K2_STYLES_PATH', TEMPLATEPATH . '/styles/');
define('K2_HEADERS_PATH', TEMPLATEPATH . '/images/headers/');


// Define additional folders for Wordpress mu
if ( K2_MU ) {
    define('K2_MU_STYLES_PATH', ABSPATH . UPLOADS . 'k2support/styles/');
    define('K2_MU_HEADERS_PATH', ABSPATH . UPLOADS . 'k2support/headers/');
}


// Are we using K2 Styles?
define('K2_USING_STYLES', get_stylesheet() == get_template());


// Number of sidebars to use
define('K2_SIDEBARS', 4);


// Default Header Sizes
define('K2_HEADER_WIDTH', 1138);
define('K2_HEADER_HEIGHT', 179);


/* Blast you red baron! Initialise the k2 system */
require_once(TEMPLATEPATH . '/app/classes/k2.php');
K2::init();


/* Kategorie Archiv und BISS Intern auf der Startseite ausschliessen */
function exclude_category($query) {
if ( $query->is_home ) {
$query->set('cat', '-11 -5');
}
return $query;
}
add_filter('pre_get_posts', 'exclude_category');




/* Im Magazin keine Unterkategorien anzeigen */
function fb_filter_child_cats($query) {


    $cat = get_term_by('name', $query->query_vars['category_name'], 'category');
    $child_cats = (array) get_term_children( &$cat->term_id, 'category' );
    // auch möglich
    //$child_cats = (array) get_term_children( get_cat_id($query-%gt;query_vars['category_name']), 'category' );


    if ( !$query->is_admin )
        $query->set( 'category__not_in', array_merge($child_cats) );


    return $query;
}
add_filter( 'pre_get_posts', 'fb_filter_child_cats' );




/* Nicht zu Read-More-Anker springen */
function remove_more_jump_link($link) { 
$offset = strpos($link, '#more-');
if ($offset) {
$end = strpos($link, '"',$offset);
}
if ($end) {
$link = substr_replace($link, '', $offset, $end-$offset);
}
return $link;
}
add_filter('the_content_more_link', 'remove_more_jump_link'); 


/* Aktive Kategorie hervorheben */


function show_active_category($text) {


    global $post;


    if( is_single() || is_category() ) {


        $categories = wp_get_post_categories($post->ID);


        foreach( $categories as $catid ) {
            $cat = get_category($catid);
            if(preg_match('#>' . $cat->name . '</a>#', $text)) {
                $text = str_replace('>' . $cat->name . '</a>', ' class="active_category">' . $cat->name . '</a>', $text);
            }
        }


    }


    return $text;


}


add_filter('wp_list_categories', 'show_active_category');


function sgr_show_current_cat_on_single($output) {
 
    global $post;
 
    if( is_single() ) {
 
        $categories = wp_get_post_categories($post->ID);
 
        foreach( $categories as $catid ) {
            $cat = get_category($catid);
            // Find cat-item-ID in the string
            if(preg_match('#cat-item-' . $cat->cat_ID . '#', $output)) {
                $output = str_replace('cat-item-'.$cat->cat_ID, 'cat-item-'.$cat->cat_ID . ' current-cat', $output);
            }
        }
 
    }
    return $output;
}




add_filter('wp_list_categories', 'sgr_show_current_cat_on_single');


remove_action('wp_head', 'wp_generator');


?>

function fb_filter_child_cats($query) {


    $cat = get_term_by('name', $query->query_vars['category_name'], 'category');
    $child_cats = (array) get_term_children( &$cat->term_id, 'category' );
    // auch möglich
    //$child_cats = (array) get_term_children( get_cat_id($query-%gt;query_vars['category_name']), 'category' );


    if ( !$query->is_admin )
        $query->set( 'category__not_in', array_merge($child_cats) );


    return $query;
}
add_filter( 'pre_get_posts', 'fb_filter_child_cats' );