taxonomy_exists() │ WP 3.0.0

Checks that the taxonomy name exists.

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.

Used By: is_taxonomy_hierarchical()
1 time — 0.00001 sec (speed of light) | 50000 times — 0.02 sec (speed of light) | PHP 7.0.14, WP 4.7

No Hooks.

Return

true|false. Whether the taxonomy exists.

Usage

taxonomy_exists( $taxonomy );
$taxonomy(string) (required)
Name of taxonomy object.

Examples

0

#1 Various options for checks: 

$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 variable $wp_taxonomies['my_taxonomy'] does not exist

Notes

  • Global. WP_Taxonomy[]. $wp_taxonomies The registered taxonomies.

Changelog

Since 3.0.0 Introduced.

taxonomy_exists() code WP 6.7.1

wp-includes/taxonomy.php 
function taxonomy_exists( $taxonomy ) {
	global $wp_taxonomies;

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

Conditional tags (all)

Taxonomies: categories, tags, ...