get_terms( array|string $args = array(), array $deprecated = '' )

Retrieve the terms in a given taxonomy or list of taxonomies.


Description Description

You can fully inject any customizations to the query before it is sent, as well as control the output with a filter.

The ‘get_terms’ filter will be called when the cache has the term and will pass the found term along with the array of $taxonomies and array of $args. This filter is also called before the array of terms is passed and will pass the array of terms, along with the $taxonomies and $args.

The ‘list_terms_exclusions’ filter passes the compiled exclusions along with the $args.

The ‘get_terms_orderby’ filter passes the ORDER BY clause for the query along with the $args array.

Prior to 4.5.0, the first parameter of get_terms() was a taxonomy or list of taxonomies:

$terms = get_terms( 'post_tag', array(
    'hide_empty' => false,
) );

Since 4.5.0, taxonomies should be passed via the ‘taxonomy’ argument in the $args array:

$terms = get_terms( array(
    'taxonomy' => 'post_tag',
    'hide_empty' => false,
) );

Parameters Parameters

$args

(array|string) (Optional) Array or string of arguments to get terms.

  • 'taxonomy'
    (string|array) Taxonomy name, or array of taxonomies, to which results should be limited.
  • 'orderby'
    (string) Field(s) to order terms by. Accepts term fields ('name', 'slug', 'term_group', 'term_id', 'id', 'description'), 'count' for term taxonomy count, 'include' to match the 'order' of the $include param, 'meta_value', 'meta_value_num', the value of $meta_key, the array keys of $meta_query, or 'none' to omit the ORDER BY clause. Defaults to 'name'.
  • 'order'
    (string) Whether to order terms in ascending or descending order. Accepts 'ASC' (ascending) or 'DESC' (descending). Default 'ASC'.
  • 'hide_empty'
    (bool|int) Whether to hide terms not assigned to any posts. Accepts 1|true or 0|false. Default 1|true.
  • 'include'
    (array|string) Array or comma/space-separated string of term ids to include.
  • 'exclude'
    (array|string) Array or comma/space-separated string of term ids to exclude. If $include is non-empty, $exclude is ignored.
  • 'exclude_tree'
    (array|string) Array or comma/space-separated string of term ids to exclude along with all of their descendant terms. If $include is non-empty, $exclude_tree is ignored.
  • 'number'
    (int|string) Maximum number of terms to return. Accepts ''|0 (all) or any positive number. Default ''|0 (all).
  • 'offset'
    (int) The number by which to offset the terms query.
  • 'fields'
    (string) Term fields to query for. Accepts 'all' (returns an array of complete term objects), 'ids' (returns an array of ids), 'id=>parent' (returns an associative array with ids as keys, parent term IDs as values), 'names' (returns an array of term names), 'count' (returns the number of matching terms), 'id=>name' (returns an associative array with ids as keys, term names as values), or 'id=>slug' (returns an associative array with ids as keys, term slugs as values). Default 'all'.
  • 'name'
    (string|array) Optional. Name or array of names to return term(s) for.
  • 'slug'
    (string|array) Optional. Slug or array of slugs to return term(s) for.
  • 'hierarchical'
    (bool) Whether to include terms that have non-empty descendants (even if $hide_empty is set to true). Default true.
  • 'search'
    (string) Search criteria to match terms. Will be SQL-formatted with wildcards before and after.
  • 'name__like'
    (string) Retrieve terms with criteria by which a term is LIKE $name__like.
  • 'description__like'
    (string) Retrieve terms where the description is LIKE $description__like.
  • 'pad_counts'
    (bool) Whether to pad the quantity of a term's children in the quantity of each term's "count" object variable. Default false.
  • 'get'
    (string) Whether to return terms regardless of ancestry or whether the terms are empty. Accepts 'all' or empty (disabled).
  • 'child_of'
    (int) Term ID to retrieve child terms of. If multiple taxonomies are passed, $child_of is ignored. Default 0.
  • 'parent'
    (int|string) Parent term ID to retrieve direct-child terms of.
  • 'childless'
    (bool) True to limit results to terms that have no children. This parameter has no effect on non-hierarchical taxonomies. Default false.
  • 'cache_domain'
    (string) Unique cache key to be produced when this query is stored in an object cache. Default is 'core'.
  • 'update_term_meta_cache'
    (bool) Whether to prime meta caches for matched terms. Default true.
  • 'meta_query'
    (array) Meta query clauses to limit retrieved terms by. See WP_Meta_Query.
  • 'meta_key'
    (string) Limit terms to those matching a specific metadata key. Can be used in conjunction with $meta_value.
  • 'meta_value'
    (string) Limit terms to those matching a specific metadata value. Usually used in conjunction with $meta_key.

Default value: array()

$deprecated

(array) (Optional) Argument array, when using the legacy function parameter format. If present, this parameter will be interpreted as $args, and the first function parameter will be parsed as a taxonomy or array of taxonomies.

Default value: ''


Top ↑

Return Return

(array|int|WP_Error) List of WP_Term instances and their children. Will return WP_Error, if any of $taxonomies do not exist.


Top ↑

Source Source

File: wp-includes/taxonomy.php

function get_terms( $args = array(), $deprecated = '' ) {
	global $wpdb;

	$term_query = new WP_Term_Query();

	/*
	 * Legacy argument format ($taxonomy, $args) takes precedence.
	 *
	 * We detect legacy argument format by checking if
	 * (a) a second non-empty parameter is passed, or
	 * (b) the first parameter shares no keys with the default array (ie, it's a list of taxonomies)
	 */
	$_args = wp_parse_args( $args );
	$key_intersect  = array_intersect_key( $term_query->query_var_defaults, (array) $_args );
	$do_legacy_args = $deprecated || empty( $key_intersect );

	if ( $do_legacy_args ) {
		$taxonomies = (array) $args;
		$args = wp_parse_args( $deprecated );
		$args['taxonomy'] = $taxonomies;
	} else {
		$args = wp_parse_args( $args );
		if ( isset( $args['taxonomy'] ) && null !== $args['taxonomy'] ) {
			$args['taxonomy'] = (array) $args['taxonomy'];
		}
	}

	if ( ! empty( $args['taxonomy'] ) ) {
		foreach ( $args['taxonomy'] as $taxonomy ) {
			if ( ! taxonomy_exists( $taxonomy ) ) {
				return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );
			}
		}
	}

	$terms = $term_query->query( $args );

	// Count queries are not filtered, for legacy reasons.
	if ( ! is_array( $terms ) ) {
		return $terms;
	}

	/**
	 * Filters the found terms.
	 *
	 * @since 2.3.0
	 * @since 4.6.0 Added the `$term_query` parameter.
	 *
	 * @param array         $terms      Array of found terms.
	 * @param array         $taxonomies An array of taxonomies.
	 * @param array         $args       An array of get_terms() arguments.
	 * @param WP_Term_Query $term_query The WP_Term_Query object.
	 */
	return apply_filters( 'get_terms', $terms, $term_query->query_vars['taxonomy'], $term_query->query_vars, $term_query );
}


Top ↑

Changelog Changelog

Changelog
Version Description
4.5.0 Changed the function signature so that the $args array can be provided as the first parameter. Introduced 'meta_key' and 'meta_value' parameters. Introduced the ability to order results by metadata.
4.4.0 Introduced the ability to pass 'term_id' as an alias of 'id' for the orderby parameter. Introduced the 'meta_query' and 'update_term_meta_cache' parameters. Converted to return a list of WP_Term objects.
4.2.0 Introduced 'name' and 'childless' parameters.
2.3.0 Introduced.


Top ↑

User Contributed Notes User Contributed Notes

  1. Skip to note content
    Contributed by znowebdev

    Get all post categories ordered by count.

    String syntax:

    $categories = get_terms( 'category', 'orderby=count&hide_empty=0' );
    

    Array syntax:

    $categories = get_terms( 'category', array(
    	'orderby'    => 'count',
    	'hide_empty' => 0,
    ) );
    

    Get all the links categories:

    $my_links_categories = get_terms( 'link_category', 'orderby=count&hide_empty=0' );
    

    List all the terms in a custom taxonomy, without a link:

    $terms = get_terms( 'my_taxonomy' );
    if ( ! empty( $terms ) && ! is_wp_error( $terms ) ){
    	echo '<ul>';
    	foreach ( $terms as $term ) {
    		echo '<li>' . $term->name . '</li>';
    	}
    	echo '</ul>';
    }
    

    List all the terms, with link to term archive, separated by an interpunct (ยท):

    $args = array( 'hide_empty=0' );
    
    $terms = get_terms( 'my_term', $args );
    if ( ! empty( $terms ) && ! is_wp_error( $terms ) ) {
    	$count = count( $terms );
    	$i = 0;
    	$term_list = '<p class="my_term-archive">';
    	foreach ( $terms as $term ) {
    		$i++;
    		$term_list .= '<a href="' . esc_url( get_term_link( $term ) ) . '" alt="' . esc_attr( sprintf( __( 'View all post filed under %s', 'my_localization_domain' ), $term->name ) ) . '">' . $term->name . '</a>';
    		if ( $count != $i ) {
    			$term_list .= ' &middot; ';
    		}
    		else {
    			$term_list .= '</p>';
    		}
    	}
    	echo $term_list;
    }
    
  2. Skip to note content
    Contributed by ancawonka

    As of WordPress 4.6.1, here’s the array that’s returned (to add to Leo’s helpful note above)

    array(1) {
      [0]=>
      object(WP_Term) (11) {
        ["term_id"]=>  //int
        ["name"]=>	//string 
        ["slug"]=>  //string 
        ["term_group"]=>  //int
        ["term_taxonomy_id"]=> //int
        ["taxonomy"]=>	//string
        ["description"]=>	//string
        ["parent"]=>	//int
        ["count"]=>	// int
        ["filter"]=>	//string
        ["meta"]=> array(0) { // presumably this would be some returned meta-data?
        }
      }
    }
    
  3. Skip to note content
    Contributed by khoipro

    Get Categories by custom post type with dropdown:

    function taxonomy_list_dropdown($type, $post_type) {
      $terms = get_terms($type);
      $category = taxonomy_current($type);
    
      if ( !empty( $terms ) && !is_wp_error( $terms ) ){
        the_terms_list(
          'categories__dropdown icon-dropdown',
          array(
            'show_option_all'  => 'Click to filter',
            'taxonomy'         => $type,
            'current_category' => $category->term_id,
            'value_field'      => 'slug',
            'selected'         => $category->slug,
          ),
          'dropdown',
          'data-module-init="redirect-dropdown"'
        );
      }
    }
    

You must log in before being able to contribute a note or feedback.