term_is_ancestor_of() WP 1.0

Check if a term is an ancestor of another term.

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

No Hooks.

Return

true/false. Whether $term2 is a child of $term1.

Usage

term_is_ancestor_of( $term1, $term2, $taxonomy );

$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.

Code of term is ancestor of: wp-includes/taxonomy.php ^{WP 5.2.1}

<?php
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 );
}

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