What is Taxonomy A taxonomy is a way to group things together. In WordPress, some common taxonomies are category, link, tag, or post format. https://codex.wordpress.org/Taxonomies#Default_Taxonomies.?
WordPress data objects, such as posts and users, can be grouped using taxonomy terms. A term is a grouping entity that exists in many-to-many relationships with other entities. A taxonomy is a grouping of terms, within which terms must be unique. WordPress ships with a number of built-in taxonomies, such as the hierarchical categories and the non-hierarchical tags. Since version 2.3, WordPress has also allowed plugins and themes to register custom taxonomies. A number of auxiliary WP features, like post formats and nav menus, are powered in part by taxonomy terms.
What does the Taxonomy component include?
The Taxonomy component covers:
- The custom taxonomy API An API or Application Programming Interface is a software intermediary that allows programs to interact with each other and share data in limited, clearly defined ways.:
register_taxonomy(), etc
- Business functions for the creation, retrieval, updating, and deletion of taxonomy terms:
wp_insert_term(), get_terms(), etc
- Dashboard panels for managing taxonomy terms, such as
edit-tags.php, and the parts of the Posts interface that are used to manage taxonomy term relationships, such as the Categories and Tags metaboxes
Ongoing projects
We have an ambitious taxonomy roadmap, and have been making incremental progress on a few large projects during the last few major WordPress releases. See ‘taxonomy’ posts on make/core for some background.
In WordPress 4.4, we’re beginning work on a few new projects:
- Better data modeling and
WP_Term #14162
- Combining the
wp_terms and wp_term_taxonomy tables #30262
- Term meta Meta is a term that refers to the inside workings of a group. For us, this is the team that works on internal WordPress sites like WordCamp Central and Make WordPress. #10142
Recent posts on the make/core Core is the set of software required to run WordPress. The Core Development Team builds WordPress. blog (versus network, site)
View all posts tagged taxonomy.
Recent posts on the make/test blog
View all posts tagged taxonomy.
251 open tickets in the Taxonomy component
251 open tickets. Last 7 days: +1 ticket Created for both bug reports and feature development on the bug tracker.
56 tickets that have no replies
View list on Trac
- #36610 Loss of multibyte category The 'category' taxonomy lets you group posts / content together that share a common bond. Categories are pre-defined and broad ranging. and tag A directory in Subversion. WordPress uses tags to store a single snapshot of a version (3.6, 3.6.1, etc.), the common convention of tags in version control systems. (Not to be confused with post tags.) names
- #36956 Trigger event when taxonomy term is added with ajax administration
- #36978 Add pre filter Filters are one of the two types of Hooks https://codex.wordpress.org/Plugin_API/Hooks. They provide a way for functions to modify data of other functions. They are the counterpart to Actions. Unlike Actions, filters are meant to work in an isolated manner, and should never have side effects such as affecting global variables and output. to get_term_by
- #38265 Add term_relationship_id column to wp_term_relationships
- #38278 Only query taxonomies assigned to the post types being queried
- #39754 `_post_format_get_terms()` can overwrite names of terms in other taxonomies
- #39969 add filter to end of post_categories_meta_box()
- #40232 Could is_tax check through queried_terms instead of queried_object?
- #40291 subcategory pagination no run
- #41631 Same Term Not Added
- #41702 Slug for Category or Tag should be generated automatically ui administration
- #41776 wp_list_category array element 'exclude' better be called 'exclude_id'
- #41878 No way to change the order of fields for taxonomy meta
- #41882 Walker_CategoryDropdown does not wrap options inside HTML HyperText Markup Language. The semantic scripting language primarily used for outputting content in web browsers. select element with wp_list_categories
- #42104 Tax query transformations unintentionally filtered by 'terms_clauses'
- #42572 Can't delete custom taxonomy tags from a post
- #43798 Add multiple parent ids in get_terms function
- #44630 WP_Term_Query does not return all terms when 'number' and 'object_ids' are specified
- #45092 WP_Query->is_category wrongly calculate current category when WP_Term is passed
- #45393 categories don't work in brand-new wordpress instance (return 404)
- #45722 add markup to highlight the active tag
- #45938 Adding new term meta fails if column is wrapped in a conditional
- #46162 get_taxonomies by post_type no output
- #46166 wp_update_term sanitizes the description, removing all html
- #47029 Custom Taxonomies, with no post_type association and custom submenu location, UX User experience experience is broken when on Taxonomy management page
- #47310 Add Column Taxonomy Links Filter to Media List Table administration
- #48220 Category Dropdown Layout Issue
- #48284 MIsleading behavior and documentation in include argument of WP_Term_Query docs
- #48498 Walker_Category should also accept the `item_spacing` parameter.
- #48682 Introduce WP_Labels class
- #49189 Term description cannot be filtered in admin (and super admin) area ui administration
- #49488 WP-ADMIN > Add New Post Tags section – Issue ui administration
- #49559 Post Category Restoration ui administration
- #49632 Force lowercase for taxonomy id in register_taxonomy()
- #50046 lack table selector in `_update_post_term_count`
- #50229 slugs aren't allowed as long as they're in different taxonomies.
- #51264 There is no option to remove default_term using register_taxonomy() or unregister_taxonomy()
- #51666 Cannot unselect terms for a taxonomy with a default_term
- #51759 WordPress the_tags() before not working at the loop The Loop is PHP code used by WordPress to display posts. Using The Loop, WordPress processes each post to be displayed on the current page, and formats it according to how it matches specified criteria within The Loop tags. Any HTML or PHP code in the Loop will be processed on each post. https://codex.wordpress.org/The_Loop.
- #51864 set_object_terms hook $tt_ids arg issue
- #51905 Issue with 'is_object_in_term' when terms assigned in increseing order
- #52726 Allow default term when a user does not have assign_terms capability
- #52904 WP_Term_Query does not return deeper descendants of child_of when direct children of child_of are not part of the results
- #52975 Add "states" to terms list table (for WP_Taxonomy::$default_term) administration
- #54567 Introduce specific item_link and and item_link_description labels for post formats
- #55854 Save term creation time by default template performance
- #55956 Pass $maybe_orderby_meta into 'get_terms_orderby' filter
- #56892 wp_xx_categories() doesn't pad counts correctly when a sub-category exists
- #56895 SEO tools can't differ from Tag and Categories ui
- #57619 register_taxonomy doesn't check for reserved terms coding-standards
- #59478 term_exists() to return false if no terms exist
- #59667 Edit Category Screen: Improve error message when trying to update a category with an existing slug
- #60159 Performance Issues with Large Number of Categories in WordPress Admin Panel administration performance
- #60269 URL A specific web address of a website or web page on the Internet, such as a website’s URL www.wordpress.org parameter filtering with 'tag' parameter
- #60710 save_post_{$post->post_type} hook returns inconsistent $_POST['tax_input'] format
- #61761 `wp_term_insert` inconsistent validation logic for `name` and `slug` administration
1 ticket slated for 6.8
View list in Trac
- #61890 Handle WP_Term dynamic properties for PHP The web scripting language in which WordPress is primarily architected. WordPress requires PHP 7.4 or higher 8.2 coding-standards php-compatibility
251 open tickets
Open enhancements: 97 View list on Trac
Open tasks: 1 View list on Trac
Open feature requests: 20 View list on Trac
Open defects: 133 View list on Trac
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Boone Gorges
