WordPress Breadcrumb function

breadcrumb.php

<?php

function wds_breadcrumbs() {

    global $post, $paged;
    
    if ( !is_home() || !is_front_page() || !is_paged() ) {

        echo '<a href="' . esc_url( get_home_url() ) . '" class="crumb-home"><span class="screen-reader-text">' . __( 'Home', 'wds' ) . '</span></a>';

        if ( is_category() ) {

            $category = get_the_category();

            if ( $category ) {
                foreach ( $category as $category ) {
                echo '<a href="' . get_category_link( $category->term_id ) . '">' . $category->name . '</a>';
                }
            }

            sprintf( __( 'Posts filed under <q>%s</q>', 'wds' ), single_cat_title( '', false ) );
        
        } elseif ( is_day() ) {

            echo '<li><span><a href="' . get_year_link( get_the_time('Y') ) . '">' . get_the_time('Y') . '</a></span></li>';
            echo '<li><span><a href="' . get_month_link( get_the_time('Y'), get_the_time('m') ) . '">' . get_the_time('F') . '</a></span></li>';
            echo '<li class="active"><span>' . get_the_time('d') . '</span></li>';
        
        } elseif ( is_month() ) {

            echo '<li><span><a href="' . get_year_link( get_the_time('Y') ) . '">' . get_the_time('Y') . '</a></span></li>';
            echo '<li class="active"><span>' . get_the_time('F') . '</span></li>';
        
        } elseif ( is_year() ) {

            echo '<li class="active"><span>' . get_the_time('Y') . '</span></li>';
        
        } elseif ( is_single() && !is_attachment() ) {
            
            if ( get_post_type() != 'post' ) {

                $post_type = get_post_type_object( get_post_type() );
                $slug = $post_type->rewrite;
                echo '<li><span><a href="' . home_url() . '/' . $slug['slug'] . '/">' . $post_type->labels->singular_name . '</a></span></li>';
                echo '<li class="active"><span>' . get_the_title() . '</span></li>';
            
            } else {

                $category = get_the_category();

                if ( $category ) {
                    foreach ( $category as $category ) {
                    echo '<li><span><a href="' . get_category_link($category->term_id) . '">' . $category->name . '</a></span></li>';
                    }
                }

                echo '<li class="active"><span>' . get_the_title() . '</span></li>';
            }

        } elseif ( !is_single() && !is_page() && get_post_type() != 'post' && !is_404() ) {

            $post_type = get_post_type_object( get_post_type() );
            echo '<li class="active"><span>' . $post_type->labels->singular_name . '</span></li>';

        } elseif ( is_attachment() ) {

            $parent = get_post( $post->post_parent );
            $category = get_the_category( $parent->ID );

            if ( $category ) {
                foreach ( $category as $category ) {
                echo '<li><span><a href="' . get_category_link($category->term_id) . '">' . $category->name . '</a></span></li>';
                }
            }

            echo '<li class="active"><span>' . get_the_title() . '</span></li>';

        } elseif ( is_page() && !$post->post_parent ) {
            echo '<li class="active"><span>' . get_the_title() . '</span></li>';

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

            $parent_id = $post->post_parent;
            $breadcrumbs = array();
            while ( $parent_id != 0 ) {
                $page = get_post($parent_id);
                $breadcrumbs[] = '<li><span><a href="' . get_permalink($page->ID) . '">' . get_the_title( $page->ID ) . '</a></span></li>';
                    //Get next parent, walk backwards
                    $parent_id = $page->post_parent;
            }

            $breadcrumbs = array_reverse( $breadcrumbs );

            foreach ( $breadcrumbs as $crumb ) {
                echo wp_kses( $crumb, $accepted_parameters );
            }

            echo '<li class="active"><span>' . get_the_title() . '</span></li>';
        
        } elseif ( is_search() ) {
            echo '<li class="active"><span>' . sprintf( __( 'Search results for <q>%s</q>', 'museum-core' ), esc_attr( get_search_query() ) ) . '</span></li>';
        
        } elseif ( is_tag() ) {
            echo '<li class="active"><span>' . sprintf( __( 'Posts tagged <q>%s</q>', 'museum-core' ), single_tag_title( '', false ) ) . '</span></li>';
        
        } elseif ( is_author() ) {
            global $author;
            echo '<li class="active"><span>' . sprintf( __( 'All posts by %s', 'museum-core' ), get_the_author_meta('display_name',$author) ) . '</span></li>';
        
        } elseif ( is_404() ) {
            echo '<li class="active"><span>' . __( 'Error 404', 'museum-core' ) . '</span></li>';
        }
    }
    if ( is_paged() ) {
        $front_page_ID = get_option( 'page_for_posts' );
        if ( is_category() || is_day() || is_month() || is_year() || is_search() || is_tag() || is_author() ) {
            echo '&nbsp;<span class="active paged">(' . sprintf( __( 'Page %s', 'museum-core' ), esc_attr( $paged ) ) . ')</li>';
        } else {
            echo '<li><span><a href="' . esc_url( get_home_url() ) . '">' . __( 'Home', 'museum-core' ) . '</a></span></li>';
            echo '<li><span><a href="' . esc_url( get_home_url() ) . '/?p=' . $front_page_ID . '">' . __( 'Blog', 'museum-core' ) . '</a></span></li>';
            echo '<li class="active paged">' . sprintf( __( 'Page %s', 'museum-core' ), esc_attr( $paged ) ) . '</li>';
        }
    }
    echo '</ul>';
}

?>