WordPress Breadcrumbs

/**
 * Breadcrumbs
 *
 * Prints a list with breadcrumbs.
 *
 * @param array $attributes shortcode parameters
 * @return html
 * @author keha76
 */
function keha76_breadcrumbs( $attributes = array() ) {

    // Access Globals
    global $author,$post, $wp_query;

    // Extract shortcode attributes
    extract( shortcode_atts( array(
        'container_class' => 'breadcrumbs',
        'container_id'    => '',
        'current_before'  => "\n\t<li class=\"breadcrumbs-current\">",
        'current_after'   => '</li>',
        'items_wrap'      => '<ul id="%1$s" class="%2$s">%3$s'."\n".'</ul>'
    ), $attributes ) );

    // Variables
    $html                 = '';
    $home_text            = apply_filters( 'keha76_breadcrumbs_home_text', __( 'Home', 'keha76' ) );
    $home_url             = home_url();
    $posts_page_title     = get_the_title( get_option( 'page_for_posts', true ) );
    $posts_page_permalink = get_permalink( get_option( 'page_for_posts', true ) );

    // Conditional Terms
    if ( is_home() && !is_front_page() && !is_paged() ) {

        // We are on the static posts page.
        $html .= "\n\t<li><a href=\"" . $home_url . "\">" . $home_text . "</a></li>";
        $html .= "\n\t<li class=\"breadcrumbs-current\">". $posts_page_title . "</li>";

    } elseif ( is_front_page() || is_home() ) {

        if ( is_paged() ) {
            // We are on the front home page.
            $html .= "\n\t<li><a href=\"" . $home_url . "\">" . $home_text . "</a></li>";
        } else {
            // We are on the front home page.
            $html .= "\n\t<li>" . $home_text . "</li>";
        }


    } elseif ( !is_home() && !is_front_page() || is_paged() ) {

        // Current page is paged and not front page or home.
        $html .= "\n\t<li><a href=\"" . $home_url . "\">" . $home_text . "</a></li>";

        if ( is_category() ) {

            $category = get_category( get_query_var( 'cat' ), false );

            if ( $category->parent != 0 ) {
                $category_parents = get_category_parents( $category->parent, true, ',' );
                $categories = split(',', $category_parents );

                foreach ( $categories as $cat ) {
                    if ( $cat != '' ) {
                        $html .= $current_before;
                        $html .= $cat;
                        $html .= $current_after;
                    }
                }
            }

            $html .= $current_before;
            $html .= single_cat_title( '', false );
            $html .= $current_after;

        } elseif ( is_tax() ) {

            $parent = get_term_by( 'id', $wp_query->queried_object->term_id, $wp_query->queried_object->taxonomy );

            if ( $parent->parent != 0 ) {

                while ( $parent->parent != 0 ) {
                    $term_id = $parent->parent;
                    $parent = get_term_by( 'id', $term_id, $wp_query->queried_object->taxonomy );
                    $link = get_term_link( $parent );
                    $output[] = "\n\t".'<li><a href="' . $link . '">' . $parent->name .'</a></li>';
                }

                $output_reverse = array_reverse( $output );
                foreach ( $output_reverse as $list_item ) {
                    $html .= $list_item;
                }
            }

            $html .= "\n\t".'<li>' . $wp_query->queried_object->name .'</li>';

        } elseif ( is_day() ) {

            $html .= "\n\t".'<li><a href="' . get_year_link( get_the_time( 'Y' ) ) . '">' . get_the_time( 'Y' ) . '</a></li>';
            $html .= "\n\t".'<li><a href="' . get_month_link( get_the_time( 'Y' ), get_the_time( 'm' ) ) . '">' . get_the_time( 'F' ) . '</a></li>';

            $html .= $current_before;
            get_the_time( 'd' );
            $html .= $current_after;

        } elseif ( is_month() ) {

            $html .= "\n\t".'<li><a href="' . get_year_link(get_the_time('Y')) . '">' . get_the_time('Y') . '</a></li>';

            $html .= $current_before;
            get_the_time( 'F' );
            $html .= $current_after;

        } elseif ( is_year() ) {

            $html .= $current_before;
            get_the_time( 'Y' );
            $html .= $current_after;

        } elseif ( is_single() && !is_attachment() ) {

            $html .= $current_before;
            $html .= get_the_title();
            $html .= $current_after;

        } elseif ( is_attachment() ) {

            $post_parent = get_post( $post->post_parent );
            $post_title = trim( $parent->post_title );

            $html .= "\n\t".'<li><a href="' . get_permalink( $post_parent ) . '">' . $post_title . '</a></li>';

            $html .= $current_before;
            get_the_time( 'd' );
            $html .= $current_after;

        } elseif ( is_page() && !$post->post_parent ) {

            $html .= $current_before;
            $html .= get_the_title();
            $html .= $current_after;

        } elseif ( is_page() && $post->post_parent ) {

            $post_parent = $post->post_parent;
            $post_childs = array();

            while ( $post_parent ) {
                $page = get_page( $post_parent );
                $post_childs[] = "\n\t".'<li><a href="' . get_permalink( $page->ID) . '">' . get_the_title( $page->ID ) . '</a></li>';
                $post_parent = $page->post_parent;
            }

            $post_childs = array_reverse( $post_childs );

            foreach ( $post_childs as $post_child ) {
                $html .= $post_child;
            }

            $html .= $current_before;
            $html .= get_the_title();
            $html .= $current_after;

        } elseif ( is_search() ) {

            $search_text = __( 'Search results for <strong>%1$s</strong>', 'keha76-blank' );

            $html .= $current_before;
            $html .= printf( $search_text, get_search_query() );
            $html .= $current_after;

        } elseif ( is_tag() ) {

            $html .= $current_before;
            $html .= single_tag_title( '', false );
            $html .= $current_after;

        } elseif ( is_author() ) {

            $userdata = get_userdata( $author );

            $html .= $current_before;
            $html .= __( 'Error 404', 'keha76-blank' );
            $html .= $current_after;

        } elseif ( is_404() ) {

            $html .= $current_before;
            $html .= __( 'Error 404', 'keha76-blank' );
            $html .= $current_after;

        }

    }

    // If current page is paged
    if ( get_query_var( 'paged' ) ) {

        if ( is_home() ) {
            $html .= "\n\t<li class=\"breadcrumbs-current\"><a href=\"$posts_page_permalink\">". $posts_page_title . "</a></li>";
        }

        $html .= "\n\t<li class=\"breadcrumbs-paged\">";
        $html .= 'Page ' . get_query_var( 'paged' ) . ' of ' . $wp_query->max_num_pages;
        $html .= $current_after;

    }

    $output = sprintf( $items_wrap, $container_id, $container_class, $html );
    return $output;
}

add_shortcode( 'breadcrumbs', 'keha76_breadcrumbs' );