Multiple choice in a custom taxonomy

Question

I've add a custom taxonomy in my function.php. Here the code:

function create_autor_nonhierarchical_taxonomy() {

    $labels = array(
        'name' => _x( 'Autor', 'taxonomy general name' ),
        'singular_name' => _x( 'Autor', 'taxonomy singular name' ),
        'search_items' =>  __( 'Buscar autores' ),
        'popular_items' => __( 'Autores populares' ),
        'all_items' => __( 'Todos los autores' ),
        'parent_item' => null,
        'parent_item_colon' => null,
        'edit_item' => __( 'Editar autor' ), 
        'update_item' => __( 'Actualizar autor' ),
        'add_new_item' => __( 'Añadir nuevo autor' ),
        'new_item_name' => __( 'Nombre del nuevo autor' ),
        'separate_items_with_commas' => __( 'Separa los autores con comas' ),
        'add_or_remove_items' => __( 'Añadir o eliminar autores' ),
        'choose_from_most_used' => __( 'Elije ente los autores más utilizados' ),
        'menu_name' => __( 'Autor' ),
    ); 

    register_taxonomy( 'autor', 'product', array(
        'hierarchical' => false,
        'labels' => $labels,
        'show_ui' => true,
        'show_admin_column' => true,
        'update_count_callback' => '_update_post_term_count',
        'query_var' => true,
        'rewrite' => array( 'slug' => 'autor' ),
    ));
}

add_action( 'init', 'create_autor_nonhierarchical_taxonomy', 0 );

function show_product_autor(){

    $authors = wp_get_post_terms( get_the_ID(), 'autor' );
    $author = array_pop($authors);

    $authorTeamPg = get_page_by_title( $author->name, 'OBJECT', 'team' );
    $authorTeamPgLink = get_permalink( $authorTeamPg->ID);

    echo "<b>AUTOR: </b><a href='{$authorTeamPgLink}'>{$author->name}</a>",'<br />';

}

add_action( 'woocommerce_single_product_summary', 'show_product_autor', 24 );

Now, I've books that have more than 1 author. How could I change the code in order to display for instance 2 or 3 authors? Moreover there are books that have an editor, not properly an author (a books that have many authors and only one is in charge of the publication). Normally in this case the name of the editor is followed by a parenthesis like this (ed.). How could I add this option to the author field?

Answer 1

To display multiple authors, loop through the array of authors:

function show_product_autor(){    
    $authors = wp_get_post_terms( get_the_ID(), 'autor' );

    foreach($authors as $author) {
        $authorTeamPg = get_page_by_title( $author->name, 'OBJECT', 'team' );
        $authorTeamPgLink = get_permalink( $authorTeamPg->ID);
        echo "<b>AUTOR: </b><a href='{$authorTeamPgLink}'>{$author->name}</a>",'<br />';
    }
}

To handle editors, the simplest solution IMO would be to make the taxonomy heirarchical and add a term editor under all authors who are also editors. When selecting editors, select both author name and the 'editor' term under it.

So the above code becomes:

function show_product_autor(){    
    $authors = wp_get_post_terms( get_the_ID(), 'autor');
    $output  = array();
    foreach($authors as $author) {
        if(!$author->parent) { //if there is no parent term
            $authorTeamPg = get_page_by_title( $author->name, 'OBJECT', 'team' );
            $authorTeamPgLink = get_permalink( $authorTeamPg->ID);
            $output[$author->term_id]['url'] = "<a href='{$authorTeamPgLink}'>{$author->name}</a>";
        } else {
            $output[$author->parent]['ed'] = ' (ed.)';
        }
    }
    $outputfinal = array();
    foreach($output as $line) {
        if(!empty($line['url'])) { //just to be safe, check the url is there
            $outputfinal[] = (empty($line['ed'])) ? $line['url'] : $line['url'].$line['ed'];
        }
    }
    echo '<b>AUTOR: </b>'.implode(', ', $outputfinal).'<br />';
}