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term_exists ›

Since3.0.0
Deprecatedn/a
› term_exists ( $term, $taxonomy = '', $parent = null )
Parameters: (3)
  • (int|string) $term The term to check. Accepts term ID, slug, or name.
    Required: Yes
  • (string) $taxonomy Optional. The taxonomy name to use.
    Required: No
    Default: (empty)
  • (int) $parent Optional. ID of parent term under which to confine the exists search.
    Required: No
    Default: null
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.
Defined at:
Codex:

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 Conditional Tags} article in the Theme Developer Handbook.


Related Functions: email_exists, category_exists, username_exists, tag_exists, post_exists

Source 

function term_exists( $term, $taxonomy = '', $parent = null ) {
	global $wpdb;

	$select     = "SELECT term_id FROM $wpdb->terms as t WHERE ";
	$tax_select = "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE ";

	if ( is_int( $term ) ) {
		if ( 0 === $term ) {
			return 0;
		}
		$where = 't.term_id = %d';
		if ( ! empty( $taxonomy ) ) {
			// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.ReplacementsWrongNumber
			return $wpdb->get_row( $wpdb->prepare( $tax_select . $where . ' AND tt.taxonomy = %s', $term, $taxonomy ), ARRAY_A );
		} else {
			return $wpdb->get_var( $wpdb->prepare( $select . $where, $term ) );
		}
	}

	$term = trim( wp_unslash( $term ) );
	$slug = sanitize_title( $term );

	$where             = 't.slug = %s';
	$else_where        = 't.name = %s';
	$where_fields      = array( $slug );
	$else_where_fields = array( $term );
	$orderby           = 'ORDER BY t.term_id ASC';
	$limit             = 'LIMIT 1';
	if ( ! empty( $taxonomy ) ) {
		if ( is_numeric( $parent ) ) {
			$parent              = (int) $parent;
			$where_fields[]      = $parent;
			$else_where_fields[] = $parent;
			$where              .= ' AND tt.parent = %d';
			$else_where         .= ' AND tt.parent = %d';
		}

		$where_fields[]      = $taxonomy;
		$else_where_fields[] = $taxonomy;

		$result = $wpdb->get_row( $wpdb->prepare( "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE $where AND tt.taxonomy = %s $orderby $limit", $where_fields ), ARRAY_A );
		if ( $result ) {
			return $result;
		}

		return $wpdb->get_row( $wpdb->prepare( "SELECT tt.term_id, tt.term_taxonomy_id FROM $wpdb->terms AS t INNER JOIN $wpdb->term_taxonomy as tt ON tt.term_id = t.term_id WHERE $else_where AND tt.taxonomy = %s $orderby $limit", $else_where_fields ), ARRAY_A );
	}

	// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
	$result = $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms as t WHERE $where $orderby $limit", $where_fields ) );
	if ( $result ) {
		return $result;
	}

	// phpcs:ignore WordPress.DB.PreparedSQLPlaceholders.UnfinishedPrepare
	return $wpdb->get_var( $wpdb->prepare( "SELECT term_id FROM $wpdb->terms as t WHERE $else_where $orderby $limit", $else_where_fields ) );
}