// パンくずリスト
function breadcrumb(){
    global $post;
    $str ='';
    if(!is_home()&&!is_admin()){
        $str.= '<div id="breadcrumb" class="cf">';
        $str.= '<a href="'. home_url() .'" itemprop="url">ホーム</a> &gt;';
 
        if(is_category()) {
            $cat = get_queried_object();
            if($cat -> parent != 0){
                $ancestors = array_reverse(get_ancestors( $cat -> cat_ID, 'category' ));
                foreach($ancestors as $ancestor){
                    $str.='<a href="'. get_category_link($ancestor) .'" itemprop="url">'. get_cat_name($ancestor) .'</a> &gt;';
                }
            }
        $str.='<a href="'. get_category_link($cat -> term_id). '" itemprop="url">'. $cat-> cat_name . '</a>';
        } elseif(is_page()){
            if($post -> post_parent != 0 ){
                $ancestors = array_reverse(get_post_ancestors( $post->ID ));
                foreach($ancestors as $ancestor){
                    $str.='<a href="'. get_permalink($ancestor).'" itemprop="url">'. get_the_title($ancestor) .'</a>';
                }
            }
        } elseif(is_single()){
            $categories = get_the_category($post->ID);
            $cat = $categories[0];
            if($cat -> parent != 0){
                $ancestors = array_reverse(get_ancestors( $cat -> cat_ID, 'category' ));
                foreach($ancestors as $ancestor){
                    $str.='<a href="'. get_category_link($ancestor).'" itemprop="url">'. get_cat_name($ancestor). '</a> &gt;';
                }
            }
            $str.='<a href="'. get_category_link($cat -> term_id). '" itemprop="url">'. $cat-> cat_name . '</a>';
        } else{
            $str.='<div>'. wp_title('', false) .'</div>';
        }
        $str.='</div>';
    }
    echo $str;
}