Tremendous Taxonomies

Taxonomies have been around in WordPress for a long time as a way of grouping things together, but did you know there is a lot you can do with taxonomies which you may not know? In this talk I will outline what taxonomies are and how you can create your own custom taxonomies. I will share some use cases for having custom taxonomies as well as some different and interesting ways in which I have used taxonomies on some sites in the past. In addition I will looks at some of the ways in which you can optimise the admin UI for taxonomies, making it more appropriate in some cases. The talk will also look at how you can associate data with different taxonomy terms.

Transcript

1. Tremendous Taxonomies
   WordCamp Manchester 2016
   @wpmark
   markwilkinson.me
   highrise.digital
   

   View Slide

2. “a classification into
   ordered categories”
   dictionary.com
   

   View Slide

3. Grouping & Organising Content
   

   View Slide

4. Default
   Taxonomies
   Categories / category
   Tags / post_tag
   Link Category / link_category
   Post Formats / post_format
   Menus / nav_menu
   

   View Slide

5. Custom
   Taxonomies
   

   View Slide

6. function hd_register_tax() {
   register_taxonomy(
   $taxonomy,
   $objects,
   $args
   );
   }
   add_action( ‘init’, ‘hd_register_tax’ );
   

   View Slide

7. labels
   show_ui
   show_in_menu
   hierarchical
   meta_box_cb
   

   View Slide

8. hierarchical
   true false
   

   View Slide

9. meta_box_cb
   https://github.com/highrisedigital/highrise-taxonomy-ui
   https://github.com/johnbillion/extended-taxos
   

   View Slide

10. wp_query
    https://10up.github.io/Engineering-Best-Practices/php/
    

    View Slide

11. $news = new WP_Query(
    array(
    ‘post_type’ => ‘post’,
    ‘posts_per_page => -1,
    ‘meta_query’=> array(
    array(
    ‘key’ => ‘home_slider’,
    ‘value’ => ‘yes’
    )
    )
    )
    );
    

    View Slide

12. $news = new WP_Query(
    array(
    ‘post_type’=> ‘post’,
    ‘posts_per_page => 100,
    ‘tax_query’ => array(
    array(
    ‘tax’=> ‘locations’,
    ‘field’=> ‘slug’,
    ‘terms’=> ‘home-slider’
    )
    )
    )
    );
    

    View Slide

13. View Slide

14. Bookmarks
    https://www.flickr.com/photos/roxeteer/4326217872
    

    View Slide

15. User Bookmarks
    Logged in users can bookmark posts
    The are saved into a bookmarks page for each user
    Bookmarked posts can be removed from this page
    

    View Slide

16. user_register
    wp_insert_term()
    wp_set_object_terms()
    wp_set_object_terms()
    

    View Slide

17. add_action( 'user_register',
    hd_add_user_bk_term );
    function hd_add_user_bk_term( $user_id ) {
    wp_insert_term(
    'user-' . $user_id,
    'hd_bookmark',
    $args // term desc etc.
    );
    }
    

    View Slide

18. $post_id = absint( $_POST[ 'postid' ] );
    $user_id = absint( $_POST[ 'userid' ] );
    $term = get_term_by( 'slug', 'user-' .
    $user_id, 'hd_bookmark' );
    if( $term != false ) {
    wp_set_object_terms( $post_id,
    $term>term_id, 'hd_bookmark', true );
    }
    

    View Slide

19. $post_id = absint( $_POST[ 'postid' ] );
    $user_id = absint( $_POST[ 'userid' ] );
    $term = get_term_by( 'slug', 'user-' .
    $user_id, 'hd_bookmark' );
    if( $term != false ) {
    wp_remove_object_terms( $post_id, $term-
    >term_id, ‘hd_bookmark );
    }
    

    View Slide

20. Term Meta
    http://themehybrid.com/weblog/introduction-to-wordpress-term-meta
    

    View Slide

21. https://wordpress.org/plugins/wp-term-icons/
    

    View Slide

22. https://wordpress.org/plugins/wp-term-colors/
    

    View Slide

23. {$tax}_edit_form_fields
    {$tax}_add_form_fields
    edit_{$tax}
    create_{$tax}
    

    View Slide

24. {$tax}_add_form_fields
    

    View Slide

25. {$tax}_edit_form_fields
    

    View Slide

26. Not Just Post Types
    User Taxonomies
    

    View Slide

27. View Slide

28. WordPress Development
    WordCamp Manchester 2016 Bronze Sponsors
    

    View Slide

29. Thank you
    & Questions?
    Twitter: @wpmark
    WordPress: @wpmarkuk
    markwilkinson.me
    highrise.digital
    

    View Slide