get_term_children( int $term_id, string $taxonomy ): array|WP_Error

1176function get_term_children( $term_id, $taxonomy ) {1177	if ( ! taxonomy_exists( $taxonomy ) ) {1178		return new WP_Error( 'invalid_taxonomy', __( 'Invalid taxonomy.' ) );1179	}1180 1181	$term_id = (int) $term_id;1182 1183	$terms = _get_term_hierarchy( $taxonomy );1184 1185	if ( ! isset( $terms[ $term_id ] ) ) {1186		return array();1187	}1188 1189	$children = $terms[ $term_id ];1190 1191	foreach ( (array) $terms[ $term_id ] as $child ) {1192		if ( $term_id === $child ) {1193			continue;1194		}1195 1196		if ( isset( $terms[ $child ] ) ) {1197			$children = array_merge( $children, get_term_children( $child, $taxonomy ) );1198		}1199	}1200 1201	return $children;1202}