portfolio custom type tags support

Question

I have portfolio-post-type.php which contains this:

<?php
add_action( 'init', 'create_portfolio_post_type' );
function create_portfolio_post_type() {
    register_post_type( 'portfolio',
        array(
            'labels' => array(
                'name' => _x( 'Portfolio', 'post type general name', 'flowthemes' ),
                'singular_name' => __( 'Portfolio Item', 'post type singular name', 'flowthemes' ),
                'add_new' => _x('Add New', 'portfolio', 'flowthemes' ),
                'add_new_item' => __('Add New Portfolio Item', 'flowthemes' ),
                'edit_item' => __('Edit Portfolio Item', 'flowthemes' ),
                'new_item' => __('New Portfolio Item', 'flowthemes' ),
                'view_item' => __('View Portfolio Item', 'flowthemes' ),
                'search_items' => __('Search Portfolio Items', 'flowthemes' ),
                'not_found' =>  __('No portfolio items found', 'flowthemes' ),
                'not_found_in_trash' => __('No portfolio items found in Trash', 'flowthemes' ), 
                'parent_item_colon' => '',
                'menu_name' => _x( 'Portfolio', 'flowthemes' ),

            ),
            'public' => true,
            'exclude_from_search' => true,
            'has_archive' => false,
            'supports' => array('title', 'author', 'custom-fields', 'revisions', 'page-attributes', 'post-formats', 'comments', 'trackbacks', 'excerpt' ),
            'rewrite' => array('slug' => 'portfolio')
        )

    );
    register_taxonomy('portfolio_category','portfolio',array(
    'hierarchical' => true,
    'labels' => array(
        'name' => _x( 'Portfolio Categories', 'taxonomy general name', 'flowthemes' ),
        'singular_name' => _x( 'Portfolio Category', 'taxonomy singular name', 'flowthemes' ),
        'search_items' =>  __( 'Search Categories', 'flowthemes' ),
        'popular_items' => __( 'Popular Categories', 'flowthemes' ),
        'all_items' => __( 'All Categories', 'flowthemes' ),
        'parent_item' => null,
        'parent_item_colon' => null,
        'edit_item' => __( 'Edit Portfolio Category', 'flowthemes' ), 
        'update_item' => __( 'Update Portfolio Category', 'flowthemes' ),
        'add_new_item' => __( 'Add New Portfolio Category', 'flowthemes' ),
        'new_item_name' => __( 'New Portfolio Category Name', 'flowthemes' ),
        'separate_items_with_commas' => __( 'Separate Portfolio category with commas', 'flowthemes' ),
        'add_or_remove_items' => __( 'Add or remove portfolio category', 'flowthemes' ),
        'choose_from_most_used' => __( 'Choose from the most used portfolio category', 'flowthemes' )
    ),
    'show_ui' => true,
    'query_var' => true,
    'rewrite' => false,
    ));
}
?>

What I want to make is to add also support for tags, to be able to add also tags on portfolio post in the back-end. How can I accomplish this ?

Answer 1

Just add this code under your category registration. Check the register_taxonomy() function for more details.

Usually when you set hierarchical => true taxonomy looks like category and hierarchical => false its looks like tag.

register_taxonomy('portfolio_tag','portfolio',array(
'hierarchical' => false,
'labels' => array(
    'name' => _x( 'Portfolio Tags', 'taxonomy general name', 'flowthemes' ),
    'singular_name' => _x( 'Portfolio Tag', 'taxonomy singular name', 'flowthemes' ),
    'search_items' =>  __( 'Search Tags', 'flowthemes' ),
    'popular_items' => __( 'Popular Tags', 'flowthemes' ),
    'all_items' => __( 'All Tags', 'flowthemes' ),
    'parent_item' => null,
    'parent_item_colon' => null,
    'edit_item' => __( 'Edit Portfolio Tag', 'flowthemes' ), 
    'update_item' => __( 'Update Portfolio Tag', 'flowthemes' ),
    'add_new_item' => __( 'Add New Portfolio Tag', 'flowthemes' ),
    'new_item_name' => __( 'New Portfolio Tag Name', 'flowthemes' ),
    'separate_items_with_commas' => __( 'Separate Portfolio Tag with commas', 'flowthemes' ),
    'add_or_remove_items' => __( 'Add or remove portfolio Tag', 'flowthemes' ),
    'choose_from_most_used' => __( 'Choose from the most used portfolio Tag', 'flowthemes' )
),
'show_ui' => true,
'query_var' => true,
'rewrite' => false,
));

Showing tags on front end:

Tags: <?php echo get_the_term_list( $post->ID, 'portfolio_tag', '', ', ', '' ); ?>

Reference: http://codex.wordpress.org/Function_Reference/get_the_term_list

Answer 2

You need to add tags as a taxonomy when you register the post type. You can do this directly with register_taxonomy_for_object_type]1 or with the taxonomy array parameter of register_post_type.