taxonomy_exists( string $taxonomy )

Determines whether the taxonomy name exists.

Description

Formerly is_taxonomy(), introduced in 2.3.0.

For more information on this and similar theme functions, check out the Conditional Tags article in the Theme Developer Handbook.

Parameters

$taxonomy

(string) (Required) Name of taxonomy object.

Return

(bool) Whether the taxonomy exists.

Source

File: wp-includes/taxonomy.php 

function taxonomy_exists( $taxonomy ) {
	global $wp_taxonomies;

	return isset( $wp_taxonomies[ $taxonomy ] );
}

Used By

Used By Description
wp-includes/taxonomy.php: unregister_taxonomy()

Unregisters a taxonomy.
wp-includes/class-wp-term.php: WP_Term::get_instance()

Retrieve WP_Term instance.
wp-includes/customize/class-wp-customize-nav-menu-item-setting.php: WP_Customize_Nav_Menu_Item_Setting::populate_value()

Ensure that the value is fully populated with the necessary properties.
wp-admin/includes/class-wp-screen.php: WP_Screen::get()

Fetches a screen object.
wp-admin/includes/class-wp-terms-list-table.php: WP_Terms_List_Table::__construct()

Constructor.
wp-admin/includes/nav-menu.php: _wp_ajax_menu_quick_search()

Prints the appropriate response to a menu quick search.
wp-includes/category-template.php: wp_list_categories()

Displays or retrieves the HTML list of categories.
wp-includes/deprecated.php: is_taxonomy()

Checks that the taxonomy name exists.
wp-includes/widgets/class-wp-widget-tag-cloud.php: WP_Widget_Tag_Cloud::_get_current_taxonomy()

Retrieves the taxonomy for the current Tag cloud widget instance.
wp-includes/class-wp-tax-query.php: WP_Tax_Query::clean_query()

Validates a single query.
wp-includes/taxonomy.php: wp_update_term()

Update term based on arguments provided.
wp-includes/taxonomy.php: wp_get_object_terms()

Retrieves the terms associated with the given object(s), in the supplied taxonomies.
wp-includes/taxonomy.php: wp_set_object_terms()

Create Term and Taxonomy Relationships.
wp-includes/taxonomy.php: wp_remove_object_terms()

Remove term(s) associated with a given object.
wp-includes/taxonomy.php: wp_insert_term()

Add a new term to the database.
wp-includes/taxonomy.php: wp_count_terms()

Count how many terms are in Taxonomy.
wp-includes/taxonomy.php: get_term_children()

Merge all term children into a single array of their IDs.
wp-includes/taxonomy.php: get_term_by()

Get all Term data from database by Term field and data.
wp-includes/taxonomy.php: get_terms()

Retrieves the terms in a given taxonomy or list of taxonomies.
wp-includes/taxonomy.php: get_taxonomy()

Retrieves the taxonomy object of $taxonomy.
wp-includes/taxonomy.php: is_taxonomy_hierarchical()

Determines whether the taxonomy object is hierarchical.
wp-includes/taxonomy.php: get_objects_in_term()

Retrieve object_ids of valid taxonomy and term.
wp-includes/taxonomy.php: get_term()

Get all Term data from database by Term ID.
wp-includes/link-template.php: get_adjacent_post()

Retrieves the adjacent post.
wp-includes/link-template.php: get_boundary_post()

Retrieves the boundary post.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_newTerm()

Create a new term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_editTerm()

Edit a term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_deleteTerm()

Delete a term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTerm()

Retrieve a term.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTerms()

Retrieve all terms for a taxonomy.
wp-includes/class-wp-xmlrpc-server.php: wp_xmlrpc_server::wp_getTaxonomy()

Retrieve a taxonomy.

Changelog

Version Description
3.0.0 Introduced.

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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/functions/taxonomy_exists