wp_get_term_taxonomy_parent_id() WP 1.0

Returns the term's parent's term_ID.

No Hooks.

Return

Int/false. False on error.

Usage

wp_get_term_taxonomy_parent_id( $term_id, $taxonomy );

$term_id(int) (required)

Term ID.

$taxonomy(string) (required)

Taxonomy name.

Code of wp get term taxonomy parent id: wp-includes/taxonomy.php ^{WP 5.2.1}

<?php
function wp_get_term_taxonomy_parent_id( $term_id, $taxonomy ) {
	$term = get_term( $term_id, $taxonomy );
	if ( ! $term || is_wp_error( $term ) ) {
		return false;
	}
	return (int) $term->parent;
}

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From tag: Term (taxonomies terms)

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