Checks if a term is an ancestor of another term.

You can use either an ID or the term object for both parameters.

$term1 int|object Required

ID or object to check if this is the parent term.

$term2 int|object Required

The child term.

$taxonomy string Required

Taxonomy name that $term1 and $term2 belong to.

bool Whether $term2 is a child of $term1.

File: wp-includes/taxonomy.php. View all references

function term_is_ancestor_of( $term1, $term2, $taxonomy ) {
	if ( ! isset( $term1->term_id ) ) {
		$term1 = get_term( $term1, $taxonomy );
	}
	if ( ! isset( $term2->parent ) ) {
		$term2 = get_term( $term2, $taxonomy );
	}

	if ( empty( $term1->term_id ) || empty( $term2->parent ) ) {
		return false;
	}
	if ( $term2->parent === $term1->term_id ) {
		return true;
	}

	return term_is_ancestor_of( $term1, get_term( $term2->parent, $taxonomy ), $taxonomy );
}