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Description

Determines whether a taxonomy term exists.

Formerly is_term(), introduced in 2.3.0. For more information on this and similar theme functions, check out the {@link https://developer.wordpress.org/themes/basics/conditional-tags/ Conditional Tags} article in the Theme Developer Handbook.

Usage

$mixed = term_exists( $term, $taxonomy, $parent_term );

Parameters

$term

( int|string ) required – The term to check. Accepts term ID, slug, or name.

$taxonomy

( string ) optional – Optional. The taxonomy name to use.

$parent_term

( int ) optional – Optional. ID of parent term under which to confine the exists search.

Returns

mixed Returns null if the term does not exist. Returns the term ID if no taxonomy is specified and the term ID exists. Returns an array of the term ID and the term taxonomy ID if the taxonomy is specified and the pairing exists. Returns 0 if term ID 0 is passed to the function.

Source

File name: wordpress/wp-includes/taxonomy.php
Lines:

function term_exists( $term, $taxonomy = '', $parent_term = null ) {
  global $_wp_suspend_cache_invalidation;

  if ( null === $term ) {
    return null;
  }

  $defaults = array(
    'get'                    => 'all',
    'fields'                 => 'ids',
    'number'                 => 1,
    'update_term_meta_cache' => false,
    'order'                  => 'ASC',
    'orderby'                => 'term_id',
    'suppress_filter'        => true,
  );

  // Ensure that while importing, queries are not cached.
  if ( ! empty( $_wp_suspend_cache_invalidation ) ) {
    $defaults['cache_results'] = false;
  }

  if ( ! empty( $taxonomy ) ) {
    $defaults['taxonomy'] = $taxonomy;
    $defaults['fields']   = 'all';
  }

  
/**
 * Filters default query arguments for checking if a term exists.
 *
 * @since 6.0.0
 *
 * @param array      $defaults    An array of arguments passed to get_terms().
 * @param int|string $term        The term to check. Accepts term ID, slug, or name.
 * @param string     $taxonomy    The taxonomy name to use. An empty string indicates
 *                                the search is against all taxonomies.
 * @param int|null   $parent_term ID of parent term under which to confine the exists search.
 *                                Null indicates the search is unconfined.
 */
  $defaults = apply_filters( 'term_exists_default_query_args', $defaults, $term, $taxonomy, $parent_term );

  if ( is_int( $term ) ) {
    if ( 0 === $term ) {
      return 0;
    }
    $args  = wp_parse_args( array( 'include' => array( $term ) ), $defaults );
    $terms = get_terms( $args );
  } else {
    $term = trim( wp_unslash( $term ) );
    if ( '' === $term ) {
      return null;
    }

    if ( ! empty( $taxonomy ) && is_numeric( $parent_term ) ) {
      $defaults['parent'] = (int) $parent_term;
    }

    $args  = wp_parse_args( array( 'slug' => sanitize_title( $term ) ), $defaults );
    $terms = get_terms( $args );
    if ( empty( $terms ) || is_wp_error( $terms ) ) {
      $args  = wp_parse_args( array( 'name' => $term ), $defaults );
      $terms = get_terms( $args );
    }
  }

  if ( empty( $terms ) || is_wp_error( $terms ) ) {
    return null;
  }

  $_term = array_shift( $terms );

  if ( ! empty( $taxonomy ) ) {
    return array(
      'term_id'          => (string) $_term->term_id,
      'term_taxonomy_id' => (string) $_term->term_taxonomy_id,
    );
  }

  return (string) $_term;
}
 

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