taxonomy_exists() – Function | Developer.WordPress.org

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

$taxonomystringrequired: Name of taxonomy object.

Return

bool Whether the taxonomy exists.

Source

function taxonomy_exists( $taxonomy ) {
	global $wp_taxonomies;

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

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Used by	Description
unregister_taxonomy()`wp-includes/taxonomy.php`	Unregisters a taxonomy.
WP_Term::get_instance()`wp-includes/class-wp-term.php`	Retrieve WP_Term instance.
WP_Customize_Nav_Menu_Item_Setting::populate_value()`wp-includes/customize/class-wp-customize-nav-menu-item-setting.php`	Ensure that the value is fully populated with the necessary properties.
WP_Screen::get()`wp-admin/includes/class-wp-screen.php`	Fetches a screen object.
WP_Terms_List_Table::__construct()`wp-admin/includes/class-wp-terms-list-table.php`	Constructor.
_wp_ajax_menu_quick_search()`wp-admin/includes/nav-menu.php`	Prints the appropriate response to a menu quick search.
wp_list_categories()`wp-includes/category-template.php`	Displays or retrieves the HTML list of categories.
is_taxonomy()`wp-includes/deprecated.php`	Checks that the taxonomy name exists.
WP_Widget_Tag_Cloud::_get_current_taxonomy()`wp-includes/widgets/class-wp-widget-tag-cloud.php`	Retrieves the taxonomy for the current Tag cloud widget instance.
WP_Tax_Query::clean_query()`wp-includes/class-wp-tax-query.php`	Validates a single query.
wp_update_term()`wp-includes/taxonomy.php`	Updates term based on arguments provided.
wp_get_object_terms()`wp-includes/taxonomy.php`	Retrieves the terms associated with the given object(s), in the supplied taxonomies.
wp_set_object_terms()`wp-includes/taxonomy.php`	Creates term and taxonomy relationships.
wp_remove_object_terms()`wp-includes/taxonomy.php`	Removes term(s) associated with a given object.
wp_insert_term()`wp-includes/taxonomy.php`	Adds a new term to the database.
wp_count_terms()`wp-includes/taxonomy.php`	Counts how many terms are in taxonomy.
get_term_children()`wp-includes/taxonomy.php`	Merges all term children into a single array of their IDs.
get_term_by()`wp-includes/taxonomy.php`	Gets all term data from database by term field and data.
get_terms()`wp-includes/taxonomy.php`	Retrieves the terms in a given taxonomy or list of taxonomies.
get_taxonomy()`wp-includes/taxonomy.php`	Retrieves the taxonomy object of $taxonomy.
get_objects_in_term()`wp-includes/taxonomy.php`	Retrieves object IDs of valid taxonomy and term.
is_taxonomy_hierarchical()`wp-includes/taxonomy.php`	Determines whether the taxonomy object is hierarchical.
get_term()`wp-includes/taxonomy.php`	Gets all term data from database by term ID.
get_adjacent_post()`wp-includes/link-template.php`	Retrieves the adjacent post.
get_boundary_post()`wp-includes/link-template.php`	Retrieves the boundary post.
wp_get_nav_menu_items()`wp-includes/nav-menu.php`	Retrieves all menu items of a navigation menu.
wp_xmlrpc_server::wp_newTerm()`wp-includes/class-wp-xmlrpc-server.php`	Creates a new term.
wp_xmlrpc_server::wp_editTerm()`wp-includes/class-wp-xmlrpc-server.php`	Edits a term.
wp_xmlrpc_server::wp_deleteTerm()`wp-includes/class-wp-xmlrpc-server.php`	Deletes a term.
wp_xmlrpc_server::wp_getTerm()`wp-includes/class-wp-xmlrpc-server.php`	Retrieves a term.
wp_xmlrpc_server::wp_getTerms()`wp-includes/class-wp-xmlrpc-server.php`	Retrieves all terms for a taxonomy.
wp_xmlrpc_server::wp_getTaxonomy()`wp-includes/class-wp-xmlrpc-server.php`	Retrieves a taxonomy.

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Changelog

Version	Description
3.0.0	Introduced.

User Contributed Notes

Codex 9 years ago

Basic Example

$taxonomy_exist = taxonomy_exists( 'category' );
// Returns true

$taxonomy_exist = taxonomy_exists( 'post_tag' );
// Returns true

$taxonomy_exist = taxonomy_exists( 'link_category' );
// Returns true

$taxonomy_exist = taxonomy_exists( 'my_taxonomy' );
// Returns false if global $wp_taxonomies['my_taxonomy'] is not set

taxonomy_exists( string $taxonomy ): bool

In this article

Description

Parameters

Return

Source

Changelog

User Contributed Notes

taxonomy_exists( string $taxonomy ): bool

In this article

Description

Parameters

Return

Source

Related

Changelog

User Contributed Notes