Add Brand as taxonomy:
if ( ! function_exists( 'brand_tax' ) ) {
// Register Custom Taxonomy
function brand_tax() {
$labels = array(
'name' => _x( 'Brands', 'Taxonomy General Name', 'text_domain' ),
'singular_name' => _x( 'Brand', 'Taxonomy Singular Name', 'text_domain' ),
'menu_name' => __( 'Brands', 'text_domain' ),
'all_items' => __( 'All brands', 'text_domain' ),
'parent_item' => __( 'Parent brand', 'text_domain' ),
'parent_item_colon' => __( 'Parent brand:', 'text_domain' ),
'new_item_name' => __( 'New brand', 'text_domain' ),
'add_new_item' => __( 'Add New brand', 'text_domain' ),
'edit_item' => __( 'Edit brand', 'text_domain' ),
'update_item' => __( 'Update brand', 'text_domain' ),
'view_item' => __( 'View brand', 'text_domain' ),
'separate_items_with_commas' => __( 'Separate brands with commas', 'text_domain' ),
'add_or_remove_items' => __( 'Add or remove brands', 'text_domain' ),
'choose_from_most_used' => __( 'Choose from the most used', 'text_domain' ),
'popular_items' => __( 'Popular brands', 'text_domain' ),
'search_items' => __( 'Search brands', 'text_domain' ),
'not_found' => __( 'Not Found', 'text_domain' ),
'no_terms' => __( 'No brands', 'text_domain' ),
'items_list' => __( 'brands list', 'text_domain' ),
'items_list_navigation' => __( 'brands list navigation', 'text_domain' ),
);
$args = array(
'labels' => $labels,
'hierarchical' => true,
'public' => true,
'show_ui' => true,
'show_admin_column' => true,
'show_in_nav_menus' => true,
'show_tagcloud' => true,
);
register_taxonomy( 'brand', array( 'product' ), $args );
}
add_action( 'init', 'brand_tax', 0 );
}
Modify your code like this now
add_filter( 'the_title', 'custom_the_title', 10, 2 );
function custom_the_title( $title, $post_id ) {
$post_type = get_post_field( 'post_type', $post_id, true );
if( $post_type == 'product' ){
$terms = get_the_terms( $post_id, 'brand' );
foreach($terms as $term){
$output .= "<span>".$term->name."</span>";
}
$title .= "<br><p>".$output ."</p>";
}
return $title;
}
You can change markup as per your design..