How to display taxonomy terms the way they are hierarchical

term_group seemed to have never been fully developed together with the alias_of parameter. What the exact indended use is (or was), I cannot say for sure. I would just rather avoid the use of those two parameters.

Regarding your issue of creating a hierarchical tree, wp_list_categories() immediately jumps to mind (remember this works for custom taxonomies as well). You can either use wp_list_categories() as-is and manipulate the output through the parameters availble, or you can look at walk_category_tree() which wp_list_categories() uses to build its tree. walk_category_tree() also use the Walker_Category class, so you can use this to exact fine tune what you need

There is also the option of writing your own recursive function to create your tree

Related Posts:

  1. Order get_terms() By Custom Field
  2. Sorting Attributes order when using get_the_terms
  3. Allow user to set custom order to a list of custom taxonomies?
  4. wp_list_categories() by alphabet? (ex. only category titles that start with “A”) [closed]
  5. view subcategories order by id
  6. Ordering terms whilst in loop
  7. Order get_terms using a Custom Field
  8. get_terms vs. get_categories: does it matter?
  9. Woocommerce get category image full size
  10. How to Change the Categories Order in the Admin Dashboard?
  11. Control term order on a per-post basis
  12. Fixing category count
  13. get_the_terms in descending alphabetical order
  14. Exclude posts that only have the ‘Uncategorized’ category [duplicate]
  15. wp_list_categories: order by term order?
  16. Elegant way to add parent categories?
  17. Order by first name
  18. Display all posts in category, with specific tag posts at top
  19. Send an email when custom post type category is changed
  20. Excluding posts from a category but only if they’re not in multiple categories
  21. How to alter query order direction using $query->set(‘order’, ‘ASC’); inside a pre_get_posts filter?
  22. Update term count using a callback function
  23. Display Categories Assigned to a WooCommerce Product
  24. Does WordPress Offer a Way to Find All of the Categories that Don’t Have Children?
  25. Add custom taxonomy terms to WordPress menu dynamically & append #slug to url
  26. Removed slug from CPT, now How/where do I hook the filter to the taxonomy term archive pages link?
  27. Taxonomy list. Order by a specific custom post type count
  28. Action hooks returning old category instead of new category
  29. How Do I Order Posts by Modified Date? [duplicate]
  30. Display empty taxonomy terms with get_terms()
  31. How can I set custom order use this function
  32. Problems with function on function.php
  33. Change default ordering of taxonomy terms – pre_get_terms
  34. get_terms orderby numeric
  35. display taxonomy slug from term ID
  36. Custom Post Type Archive Page Filtering
  37. All, published and pending order
  38. How can i insert term in a specific language of Polylang?
  39. Show Primary Category first when I display post categories
  40. get_adjacent_post() returning weird results
  41. Order char by post title
  42. Is There a Difference Between Taxonomies and Categories?
  43. next_post_link and previous_post_link order not working properly
  44. Custom taxonomy/category order
  45. query pages by a childs publish date
  46. Get posts from specific taxonomy term
  47. Getting category URL with hyphens, not spaces
  48. Remove a category from a post when saving a new post
  49. Get parent category id from child category page for custom taxonomy
  50. Featured-Content/Featured Posts With Random Order
  51. Ordering posts by title containing numbers
  52. How to change the order of the subcategory and category in a post?
  53. How to Link to Most Recent Custom Post of Same Term
  54. Parent category / child category posts
  55. How to create a array that contains all of the children slugs of a specific parent category
  56. Getting Category Children
  57. Showing HTML if Post is In Certain Taxonomy Term
  58. Order terms by count – missing terms
  59. How to add a date creation field when a custom taxonomy relationship is created?
  60. Natural sort / ordering wp_dropdown_categories
  61. Using get_terms() to list terms from one custom taxonomy AND from one specific built-in category
  62. Add properties to term object
  63. Order posts by taxonomy terms
  64. Last post sorting get_categories
  65. List taxonomy terms assigned to a post in hierarchical view
  66. Sort categories by custom field in WordPress admin
  67. Sort by DESC works, ASC doesn’t?
  68. How to display custom taxonomy term specific post?
  69. How to get immediate children of a ‘term’ parent id through ‘get_terms’?
  70. List of terms in alphabetical order under the respective initial letter and within columns
  71. Create category after theme setup and modify the default one
  72. Order custom taxonomy hierarchy
  73. how to show all categories by get_terms
  74. Add subcategories posts to the counts column at the admin’s categories list
  75. How to sort custom post’s category by id from the theme’s function.php?
  76. Categories and Tags Conflict after Woocommerce Installation
  77. Get category of a taxonomy for a queries object in a loop
  78. Is there any WordPress way to get all categories for some selected posts?
  79. Order terms by creation date
  80. WordPress using get_term to retreive slug not working as expected
  81. Display List of Categories Within a Custom Taxonomy
  82. Creating a post that contains a list of other posts like a table of contents
  83. Sorting terms individually for each post
  84. List Terms by category
  85. Changing posts order on a page
  86. How to add a new child category via an SQL statement?
  87. Why is my post categories not displaying?
  88. Find And Add Category to Posts
  89. single post navigation order (NOT chronological)
  90. Delete Term via edit-tags.php
  91. Problem importing categories and sub-categories
  92. Use get variable when rewritten url in wordpress
  93. Random order of posts on each request
  94. How can I make have_posts() return posts ordered DESC by id?
  95. Add post order like page order
  96. How to make WordPress orderby work with post_excerpt column?
  97. Woocommerce – Display product category of product in Orders page
  98. Issue on Listing Sub Product Categories In Woocommerce
  99. Sort wordpress posts by facebook likes [closed]
  100. hide_empty property not working when using get_terms