wordpress面包屑导航

想为博客增加一个面包屑导航，加完之后发现自己的目录也不深，就一级目录，似乎没有太大的必要，折腾了半天，怎么样改过去的还得怎么样改回来，记录一下代码，以备不时之需，首先将以下代码添加至wordpress的“functions.php”文件中：

function get_breadcrumbs()
{
    global $wp_query;
    if ( !is_home() ){
        // Start the UL
        echo '<ul>';
        // Add the Home link
        echo '<li><a href="'. get_settings('home') .'">'. get_bloginfo('name') .'</a></li>';
        if ( is_category() )
        {
            $catTitle = single_cat_title( "", false );
            $cat = get_cat_ID( $catTitle );
            echo "<li> &raquo; ". get_category_parents( $cat, TRUE, "" ) ."</li>";
        }
        elseif ( is_archive() && !is_category() )
        {
            echo "<li> &raquo; Archives</li>";
        }
        elseif ( is_search() ) {
            echo "<li> &raquo; Search Results</li>";
        }
        elseif ( is_404() )
        {
            echo "<li> &raquo; 404 Not Found</li>";
        }
        elseif ( is_single() )
        {
            $category = get_the_category();
            $category_id = get_cat_ID( $category[0]->cat_name );
            echo '<li> &raquo; '. get_category_parents( $category_id, TRUE, " &raquo; " );
            echo the_title('','', FALSE) ."</li>";
        }
        elseif ( is_page() )
        {
            $post = $wp_query->get_queried_object();
            if ( $post->post_parent == 0 ){
                echo "<li> &raquo; ".the_title('','', FALSE)."</li>";
            } else {
                $title = the_title('','', FALSE);
                $ancestors = array_reverse( get_post_ancestors( $post->ID ) );
                array_push($ancestors, $post->ID);
                foreach ( $ancestors as $ancestor ){
                    if( $ancestor != end($ancestors) ){
                        echo '<li> &raquo; <a href="'. get_permalink($ancestor) .'">'. strip_tags( apply_filters( 'single_post_title', get_the_title( $ancestor ) ) ) .'</a></li>';
                    } else {
                        echo '<li> &raquo; '. strip_tags( apply_filters( 'single_post_title', get_the_title( $ancestor ) ) ) .'</li>';
                    }
                }
            }
        }
        // End the UL
        echo "</ul>";
    }
}

粘贴完代码之后，在需要出现面包屑导航的位置，比如页头“header.php”文件的某处，添加如下代码：

<?php
if (function_exists('get_breadcrumbs')){
    get_breadcrumbs(); 
} 
?>