Customize category URL

I figured this out by reading this article. It was very simple, all I had to do was:

1. Change the $talks_cat_args[rewrite][slug] from 'talks' to 'talks/category' (which I had tried before) but missed…
2. Make sure register_taxonomy is before register_post_type.

Read the article, but it’s basically because of “how WP_Rewrite works as the process of deciphering permalinks is, in a way, top-down”

For posterities sake here is the final code (with a little reformatting). I can’t argue that this is the best or cleanest way to do this, cause I’m pretty new to WordPress & PHP, but it’s working thus-far.

 $talks_labels = array(
    'name'                => 'Talks',
    'singular_name'       => 'Talk',
    'all_items'           => 'All Talks',
    'add_new'             => 'Add new',
    'add_new_item'        => 'Add new Talk',
    'edit_item'           => 'Edit Talk',
    'new_item'            => 'New Talk',
    'view_item'           => 'View Talk',
    'search_items'        => 'Search Talks',
    'not_found'           => 'No Talks found',
    'not_found_in_trash'  => 'No Talks found in Trash',
  );

  $talks_args = array(
    'labels'             => $talks_labels,
    'public'             => true,
    'publicly_queryable' => true,
    'show_ui'            => true,
    'menu_position'      => 5,
    'rewrite'            => array( 'slug' => 'talks', 'with_front' => false ),
    'has_archive'        => 'talks',
  );


  $talks_cat_labels= array(
    'name'              => 'Talk categories',
    'singular_name'     => 'Talk category',
    'search_items'      => 'Search talk categories',
    'all_items'         => 'All talk categories',
    'parent_item'       => 'Parent talk category',
    'parent_item_colon' => 'Parent talk category:',
    'edit_item'         => 'Edit talk category',
    'update_item'       => 'Update talk category',
    'add_new_item'      => 'Add new talk category',
    'new_item_name'     => 'New talk category name',
  );

  $talks_cat_args = array(
    'hierarchical' => true,            
    'labels' => $talks_cat_labels,
    'show_admin_column' => true, 
    'show_ui' => true,
    'query_var' => true,
    'rewrite' => array(
      'slug' => 'talks/category',
      'with_front' => false
    ),
  );

  register_taxonomy( 'uc_talks_cat', array('uc_talks'), $talks_cat_args );
  register_post_type( 'uc_talks', $talks_args );